Journal of Power Sources最新文献

Chemical resilience of hydrocarbon-based PEMs in fuel cells: effect of aromatic electron density on molecular degradation and in-situ aging 燃料电池中烃基PEMs的化学弹性：芳香电子密度对分子降解和原位老化的影响

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-05 DOI: 10.1016/j.jpowsour.2026.239794

Tamas Nemeth , Torben Saatkamp , Thomas Nauser , Tym de Wild , Didem Yazili-Marini , Giorgi Titvinidze , Kenji Miyatake , Lorenz Gubler

Radicals formed during operation of polymer electrolyte fuel cells, particularly during accelerated stress tests (AST), chemically degrade hydrocarbon proton exchange membranes (HC PEMs). In HC PEMs, the path from initial chemical attack over the evolution of membrane damage to failure is not yet well understood. This is evident when assessing different classes of HC PEMs in OCV hold ASTs: while chemical degradation occurs in all systems, expression of the evolution of membrane damage can differ vastly. This work combines an extensive OCV hold study with a complimentary gamma-radiolysis investigation on model small molecules for the first time. Our experiments reveal that the in-situ AST lifetime trends of HC PEMs correlate with the susceptibility of phenyl sulfonates – featuring to some extent comparable electronic configurations – to undergo degradative chain-reactions when exposed to the highly oxidizing radicals generated during the radiolysis of aqueous solutions. Our conclusions aim to incite the discussion on underlying radical stability of different HC PEMs, and we propose that electron-rich, poly(phenylene) type materials more likely undergo chemical degradation pathways that delay OCV failure, i.e. “suppress” membrane damage, when compared to electron-poor poly(phenylene sulfone) and poly(ether ether ketone) type materials.

聚合物电解质燃料电池在运行过程中，特别是在加速压力测试（AST）过程中形成的自由基，会对碳氢化合物质子交换膜（HC PEMs）产生化学降解作用。在HC PEMs中，从最初的化学攻击到膜损伤到失效的演变过程尚不清楚。在评估OCV舱ast中不同类型的HC PEMs时，这一点很明显：虽然化学降解发生在所有系统中，但膜损伤演变的表达可能有很大差异。这项工作首次结合了广泛的OCV hold研究和对模型小分子的互补γ -辐射分解研究。我们的实验表明，HC PEMs的原位AST寿命趋势与苯基磺酸盐（在某种程度上具有相似的电子构型）在暴露于水溶液辐射分解过程中产生的高氧化自由基时发生降解链反应的敏感性相关。我们的结论旨在激发对不同HC PEMs潜在自由基稳定性的讨论，并且我们提出，与电子缺乏的聚（苯砜）和聚（醚醚酮）类型材料相比，富电子的聚（苯）类型材料更有可能经历延迟OCV失效的化学降解途径，即“抑制”膜损伤。

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引用次数: 0

High-performance binder-free hybrid supercapacitor featuring in-situ electrochemical transformation of Ni3S2 to Ni(OH)2 Ni3S2原位电化学转化为Ni(OH)2的高性能无粘结剂杂化超级电容器

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239743

Ozan Öztürk , Soheil Mobtakeri , Emre Gür

Although nickel hydroxide (Ni(OH)₂) offers high theoretical capacity for supercapacitors, its practical deployment is often hindered by its intrinsic conductivity limitations and structural degradation. Herein, we introduce a robust, binder-free electrode architecture designed to circumvent these bottlenecks via the radio-frequency magnetron sputtering (RFMS) of a nickel sulfide (Ni₃S₂) film on nickel foam along with an in-situ electrochemical activation strategy. Unlike traditional methods, we utilize a sputtered nickel sulfide (Ni₃S₂) precursor that undergoes a controlled oxidative transformation during cycling, evolving into a highly active and mechanically stable Ni(OH)₂ phase. This conversion process preserves nanoscale morphology while ensuring intimate electrical contact with the current collector, effectively eliminating the contact resistance issues in binder-based systems. The optimized electrode demonstrates a superior areal capacitance of 590 mF cm⁻² at 1 mA cm⁻², corresponding to an outstanding gravimetric capacitance of 3562 F g⁻¹. Furthermore, a hybrid supercapacitor device assembled with a graphene-based negative electrode delivers an areal capacitance of 204.2 mF cm⁻², instead of degrading, the device exhibits an "electro-activation" phenomenon, yielding a 14.7% increase in capacitance after 5,000 charge–discharge cycles. These results substantiate the efficacy of the in-situ conversion route as a scalable and superior alternative to chemical routes for developing high-durability energy storage systems.

虽然氢氧化镍（Ni(OH)2）为超级电容器提供了很高的理论容量，但其实际应用常常受到其固有电导率限制和结构降解的阻碍。在此，我们介绍了一种坚固的无粘结剂电极结构，旨在通过射频磁控溅射（RFMS）在泡沫镍上的硫化镍（Ni3S2）薄膜以及原位电化学激活策略来绕过这些瓶颈。与传统方法不同，我们利用了一种溅射硫化镍（Ni3S2）前驱体，该前驱体在循环过程中经历可控的氧化转化，演变成高活性和机械稳定的Ni(OH)2相。这种转换过程保留了纳米级的形态，同时确保了与电流集电极的紧密电接触，有效地消除了基于粘合剂的系统中的接触电阻问题。优化后的电极在1ma cm−2时的面电容为590 mF cm−2，对应于3562 F g−1的出色重量电容。此外，与石墨烯基负极组装的混合超级电容器器件提供了204.2 mF cm - 2的面电容，而不是退化，该器件表现出“电激活”现象，在5,000次充放电循环后，电容增加了14.7%。这些结果证实了原位转化途径作为开发高耐久性储能系统的可扩展和优越的替代化学途径的有效性。

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引用次数: 0

Low-diameter/defect carbon nanotubes formed on nickel foam derived from nickel-cobalt Prussian blue analogs for high-performance supercapacitor 高性能超级电容器用镍钴普鲁士蓝类似物在镍泡沫上形成的低直径/缺陷碳纳米管

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-05 DOI: 10.1016/j.jpowsour.2026.239773

Zongyu Zhang , Yide Hao , Ziming Zhang , Yongxiang Wang , Haonan Shen , Jiangshan Gao , Yan He

Carbon nanotubes (CNTs) with high specific surface area, low internal resistance, high structural stability, and abundant active sites are ideal electrode materials. In this work, regulating nickel-cobalt Prussian blue analogs (Ni-Co PBA) nucleation on nickel foam (NF) guides CNTs morphological evolution, achieving in-situ growth of low-diameter/defect CNTs on NF. Ni-Co PBA is anchored on NF through deposition and chemical bonding mechanisms. Chemical vapor deposition (CVD) is employed to synthesize CNTs on the NF surface. The framework structure of Ni-Co PBA not only effectively prevents transition metal ion agglomeration, but pyrolytic Ni-Co nanoparticles also catalyze this growth. Selenization converts the nanoparticles encapsulated within CNTs into metal selenides, yielding the product [email protected]. The fabricated [email protected] electrode exhibits a specific capacitance of 1592.3 F g⁻¹ at current density of 1 A g⁻¹. The assembled [email protected]//AC achieves a maximum energy density of 48.6 Wh kg⁻¹ at power density of 800 W kg⁻¹; it also maintains 81.7% of initial specific capacitance after 10,000 cycles at a current density of 10 A g⁻¹. Importantly, this work provides inspiration for the preparation of low-diameter/defect CNTs and their application in high-performance supercapacitor energy storage.

碳纳米管具有高比表面积、低内阻、高结构稳定性和丰富的活性位点等优点，是理想的电极材料。在本研究中，通过调节镍钴普鲁士蓝类似物（Ni-Co PBA）在泡沫镍（NF）上的成核，引导碳纳米管的形态演变，实现了低直径/缺陷碳纳米管在泡沫镍（NF）上的原位生长。镍钴PBA通过沉积和化学键机制锚定在NF上。采用化学气相沉积（CVD）技术在NF表面合成CNTs。Ni-Co PBA的框架结构不仅有效地阻止了过渡金属离子的团聚，而且热解Ni-Co纳米颗粒也催化了这种生长。硒化作用将包裹在碳纳米管内的纳米颗粒转化为金属硒化物，生成产物[email protected]。制备的[email protected]电极在电流密度为1 a g−1时的比电容为1592.3 F g−1。组装的[email protected]//交流电在功率密度为800 W kg - 1时，最大能量密度为48.6 Wh kg - 1；在10 a g−1的电流密度下，在10,000次循环后，它还保持81.7%的初始比电容。重要的是，这项工作为低直径/缺陷碳纳米管的制备及其在高性能超级电容器储能中的应用提供了灵感。

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引用次数: 0

Interfacial Ni-N bond bridged Z-type g-C3N4/LaNi0.8Fe0.2O3 heterojunction for boosting photo-assisted oxygen evolution 界面Ni-N键桥接z型g-C3N4/LaNi0.8Fe0.2O3异质结促进光辅助析氧

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-05 DOI: 10.1016/j.jpowsour.2026.239719

Shijie Jia , Xing Lin , Tingting Du , Wenhao Li , Xin Zhang , Fengchun Yang

Perovskite oxides possess a flexible electronic structure suitable for electrocatalysis, yet their application in photo-assisted oxygen evolution reaction (OER) is often hindered by high photogenerated carrier recombination and limited intrinsic activity. To address these limitations, this study presents the first attempt to construct a Z-type g-C₃N₄/LaNi_0.8Fe_0.2O₃ (g-C₃N₄/LNFO) heterojunction composite for efficient photo-assisted OER performance. The strong electronic coupling via interfacial Ni-N bonds reduces charge transfer resistance, while the Z-type band alignment significantly enhances the separation efficiency of electron-hole pairs. Electrochemical evaluations demonstrate that under visible light illumination, the g-C₃N₄/LNFO catalyst requires an overpotential of only 335 mV to reach a current density of 10 mA cm⁻², representing a significant reduction of 55 mV compared to dark conditions. Furthermore, the catalyst exhibits a 70 mV improvement in overall water splitting performance and demonstrates excellent stability and rechargeability when assembled into a photo-assisted zinc-air battery. This study provides a pioneering strategy for designing energy-level matched heterojunctions to maximize the photo-assisted electrocatalytic potential of perovskite materials.

钙钛矿氧化物具有适合电催化的柔性电子结构，但其在光辅助出氧反应（OER）中的应用往往受到光生载流子复合高和固有活性有限的阻碍。为了解决这些限制，本研究首次尝试构建具有高效光辅助OER性能的z型g-C3N4/LaNi0.8Fe0.2O3 （g-C3N4/LNFO）异质结复合材料。通过界面Ni-N键的强电子耦合降低了电荷转移阻力，而z型带对准显著提高了电子-空穴对的分离效率。电化学评价表明，在可见光照明下，g-C3N4/LNFO催化剂只需要335 mV的过电位就能达到10 mA cm - 2的电流密度，与黑暗条件相比，显着降低了55 mV。此外，该催化剂的整体水分解性能提高了70 mV，并且在组装成光辅助锌空气电池时表现出优异的稳定性和可充电性。该研究为设计能量级匹配异质结以最大化钙钛矿材料的光辅助电催化潜力提供了一种开创性的策略。

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引用次数: 0

When results do not meet expectations: Why rigor and learning still matter 当结果不符合预期时：为什么严谨和学习仍然很重要

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239543

Ilias Belharouak

引用次数: 0

Operando Infrared Thermography and Quantitative Insights into Lithium Plating Dynamics on Electrodes during Fast Charging 快速充电过程中电极上锂电镀动力学的红外热成像和定量研究

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-02 DOI: 10.1016/j.jpowsour.2026.239676

Ayodeji Adeniran, Gowthaman Punithakumar, Dip Dutta, Kevin Sunil, June Bak, Bikram Bhatia, Sam Park

Lithium-ion batteries (LIBs) are critical to enabling electric vehicles and grid storage due to their high energy density and longevity. However, the development of extreme fast-charging (XFC) protocols is challenged by non-uniform thermal behavior that promotes lithium plating—a key degradation mechanism compromising safety and cycle life. This work presents an integrated approach combining operando infrared (IR) thermography and validated physics-based modeling to quantify spatial temperature gradients and their influence on lithium plating in custom-designed graphite | Li half-cells during high-rate charging. Geometry-driven current localization causes thermal hotspots and localized Li plating via electro-thermal coupling. This study provides mechanistic insight into how geometry-driven current localization couples with temperature gradients to bias where plating nucleates and grows in an operando half-cell. While the absolute plating severity in commercial full cells can differ, the framework identifies electro-thermal localization mechanisms that are relevant for understanding and designing cell hardware and charge protocols to reduce plating risk. The combined experimental-modeling framework advances understanding of plating heterogeneity and provides a pathway for optimizing cell design and charging protocols to enable safe, high-power LIB operation.

锂离子电池（LIBs）由于其高能量密度和寿命，对电动汽车和电网存储至关重要。然而，极端快速充电（XFC）协议的发展受到了热行为不均匀的挑战，这种热行为会促进锂电镀，这是影响安全性和循环寿命的关键降解机制。本研究提出了一种综合方法，结合红外热成像和基于物理验证的建模，量化空间温度梯度及其对高倍率充电时定制设计的石墨| Li半电池镀锂的影响。几何驱动的电流局域化通过电热耦合产生热热点和局域化镀锂。这项研究为几何驱动的电流定位如何与温度梯度耦合到电镀成核和生长的偏置提供了机制见解。虽然商业全电池的绝对电镀严重程度可能有所不同，但该框架确定了与理解和设计电池硬件和充电协议相关的电热定位机制，以降低电镀风险。该组合实验建模框架促进了对镀层非均匀性的理解，并为优化电池设计和充电协议提供了途径，从而实现安全、高功率的LIB操作。

{"title":"Operando Infrared Thermography and Quantitative Insights into Lithium Plating Dynamics on Electrodes during Fast Charging","authors":"Ayodeji Adeniran, Gowthaman Punithakumar, Dip Dutta, Kevin Sunil, June Bak, Bikram Bhatia, Sam Park","doi":"10.1016/j.jpowsour.2026.239676","DOIUrl":"10.1016/j.jpowsour.2026.239676","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) are critical to enabling electric vehicles and grid storage due to their high energy density and longevity. However, the development of extreme fast-charging (XFC) protocols is challenged by non-uniform thermal behavior that promotes lithium plating—a key degradation mechanism compromising safety and cycle life. This work presents an integrated approach combining operando infrared (IR) thermography and validated physics-based modeling to quantify spatial temperature gradients and their influence on lithium plating in custom-designed graphite | Li half-cells during high-rate charging. Geometry-driven current localization causes thermal hotspots and localized Li plating via electro-thermal coupling. This study provides mechanistic insight into how geometry-driven current localization couples with temperature gradients to bias where plating nucleates and grows in an operando half-cell. While the absolute plating severity in commercial full cells can differ, the framework identifies electro-thermal localization mechanisms that are relevant for understanding and designing cell hardware and charge protocols to reduce plating risk. The combined experimental-modeling framework advances understanding of plating heterogeneity and provides a pathway for optimizing cell design and charging protocols to enable safe, high-power LIB operation.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"674 ","pages":"Article 239676"},"PeriodicalIF":7.9,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low-cost rare-earth-oxide-derived Li3TmCl4Br2 halide electrolyte with superior ionic conductivity for all-solid-state batteries 低成本稀土氧化物衍生的Li3TmCl4Br2卤化物电解质，具有优异的离子电导率，用于全固态电池

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-06 DOI: 10.1016/j.jpowsour.2026.239731

Liangke Li , Yang Su , Xin Li , Yue Hu , Hongbing Ding , Jing Jing , Xiangnan Liu , Xinlu Wang , Hongbo Zhang , Guixia Liu , Wensheng Yu , Xiangting Dong , Jinxian Wang

Halide solid electrolytes (HSEs) are promising for all-solid-state batteries but are hindered by the high cost and hygroscopicity of rare-earth chloride precursors. This study addresses this challenge by developing a novel, cost-effective synthesis strategy. We utilize rare-earth oxides as starting materials and employ an ammonium salt-assisted liquid-phase method to synthesize Li₃Tm/LuCl₆-based solid electrolytes. Through systematic optimization and strategic Br⁻ doping for partial Cl⁻ substitution, we achieve a superior performer Li₃TmCl₄Br₂. This material exhibits a high room-temperature ionic conductivity of 2.94 mS cm⁻¹. Crucially, this oxide-based route reduces raw material costs by approximately 70%. Furthermore, we resolve the poor interfacial stability with Li metal by applying a Li₆PS₅Cl modification interlayer which enables stable Li stripping/plating for over 1400 h in symmetric cells. All-solid-state batteries using the modified electrolyte demonstrate excellent electrochemical performance. This work provides a rational design strategy and paves a practical path for the scalable production of high-performance and low-cost HSEs.

卤化物固体电解质（HSEs）在全固态电池中很有前途，但由于稀土氯化物前体的高成本和吸湿性而受到阻碍。本研究通过开发一种新颖的、具有成本效益的合成策略来解决这一挑战。以稀土氧化物为原料，采用铵盐辅助液相法合成了Li3Tm/ lucl6基固体电解质。通过系统优化和战略性的Br -掺杂部分Cl -取代，我们获得了性能优越的Li3TmCl4Br2。该材料具有2.94 mS cm−1的高室温离子电导率。至关重要的是，这种基于氧化物的路线将原材料成本降低了约70%。此外，我们通过应用Li6PS5Cl修饰中间层来解决与Li金属的界面稳定性差的问题，该中间层可以在对称电池中稳定剥离/镀Li超过1400小时。采用改性电解质的全固态电池表现出优异的电化学性能。这项工作提供了一个合理的设计策略，并为高性能和低成本的hse的可扩展生产铺平了一条实用的道路。

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引用次数: 0

BiPO4/hard-carbon composite anode enables 10C fast-charging for lithium-ion battery applications BiPO4/硬碳复合阳极可实现锂离子电池应用的10C快速充电

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239756

Rajendra Kumar , Pawan Kumar

Post-transition metal phosphates are promising alternatives to traditional anodes for lithium-ion batteries (LIBs), offering higher energy and power density without concerns of lithium plating. However, their practical applications are hindered by challenges, such as volume expansion, poor rate capability, and capacity degradation, particularly in fast-charging applications. This study presents a strategy to mitigate these challenges and enhance the rate performance of bismuth phosphate (BiPO₄) by creating a BiPO₄/hard carbon composite anode.

BiPO₄ nanoparticles are synthesized via a cost-effective, co-precipitation method at 350 °C (ramp of 10 °C/min). The influence of heating rates on crystallite size is also investigated. The HC sheet accelerates reaction kinetics and Li⁺ diffusion within the BiPO₄/HC composite. Consequently, the BiPO₄/HC anode demonstrates superior rate performance and cycling stability. It delivers a reversible capacity of 212.2 mAh g⁻¹ (67% retention after 500 cycles at a current rate 6C) and 200 mAh g⁻¹ (62% retention after 500 cycles at a current rate 10C), with a consistent 99.9% coulombic efficiency. Furthermore, a full cell assembled with a composite anode and lithium iron phosphate (LiFePO₄) cathode exhibits 70% capacity retention at a current density of 200 mA g⁻¹ over 250 cycles, confirming its potential for high-performance applications in LIBs.

后过渡金属磷酸盐是锂离子电池（lib）传统阳极的有希望的替代品，可以提供更高的能量和功率密度，而无需担心锂镀层。然而，它们的实际应用受到一些挑战的阻碍，如体积膨胀、低速率能力和容量退化，特别是在快速充电应用中。本研究提出了一种策略来缓解这些挑战，并通过创建BiPO4/硬碳复合阳极来提高磷酸铋（BiPO4）的速率性能。BiPO4纳米颗粒通过成本效益高的共沉淀法在350°C（10°C/min）下合成。研究了加热速率对晶粒尺寸的影响。HC片加速了反应动力学和Li+在BiPO4/HC复合材料中的扩散。因此，BiPO4/HC阳极表现出优越的速率性能和循环稳定性。它提供了212.2 mAh g - 1的可逆容量（在电流率6C下500次循环后保持67%）和200 mAh g - 1（在电流率10C下500次循环后保持62%），具有99.9%的库仑效率。此外，由复合阳极和磷酸铁锂（LiFePO4）阴极组装而成的完整电池在200 mA g−1电流密度下超过250次循环的容量保持率为70%，证实了其在锂离子电池中的高性能应用潜力。

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引用次数: 0

Techno-economic assessment of the manufacturing of NMC811 cathode active material NMC811正极活性材料制造的技术经济评价

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-09 DOI: 10.1016/j.jpowsour.2026.239534

Erik Resendiz-Mora, Usama Mohamed, Alisyn J. Nedoma, Solomon F. Brown

The manufacturing of cathode active materials (CAM) remains a focal point to improve the cost of Li-ion battery packs. A flexible process-level model has been developed and applied to determine key performance indicators of the manufacturing process of NMC811, via co-precipitation. The model predicts that nickel sulphate has the highest rate of consumption at 3.06 kg/kg CAM, followed by manganese sulphate at 0.41 kg/kg CAM, cobalt sulphate and lithium hydroxide at 0.25 kg/kg CAM, however, results carry a level of uncertainty associated with kinetic data used to model the precipitation reaction. The cost of CAM is determined to be $25.6 per kg CAM for the base case and can vary in the range $16.1–$48.4 per kg CAM, similarly, the minimum selling price of goods was determined at $32.3 per kg CAM and can fluctuate in the range $16.3 – $60.9 per kg CAM. The strength of the approach presented here lies in the capability of the model to incorporate detailed data regarding the chemistry of the system, allowing for further expansion of the model to conduct optimization studies.

阴极活性材料（CAM）的制造仍然是提高锂离子电池组成本的焦点。建立了一种柔性工艺级模型，并将其应用于共沉淀法确定NMC811制造工艺的关键性能指标。该模型预测，硫酸镍的消耗率最高，为3.06 kg/kg CAM，其次是硫酸锰，为0.41 kg/kg CAM，硫酸钴和氢氧化锂为0.25 kg/kg CAM，然而，与用于模拟沉淀反应的动力学数据相关的结果存在一定程度的不确定性。在基本情况下，CAM的成本确定为每公斤CAM 25.6美元，可在每公斤CAM 16.1美元至48.4美元的范围内波动，同样，货物的最低销售价格确定为每公斤CAM 32.3美元，可在每公斤CAM 16.3美元至60.9美元的范围内波动。这里提出的方法的优势在于模型能够包含有关系统化学的详细数据，从而允许进一步扩展模型以进行优化研究。

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引用次数: 0

Power-law analysis of the rate capability of lithium insertion materials using the dilute-electrode method 用稀释电极法对锂插入材料的速率能力进行幂律分析

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-02 DOI: 10.1016/j.jpowsour.2026.239738

Kingo Ariyoshi, Shuji Nabe

In this study, the intrinsic rate capability of lithium insertion materials was systematically investigated using the dilute-electrode method, which minimizes electrolyte transport limitations and isolates solid-state Li-ion transport. Seven representative compounds with olivine, layered, and spinel structures were examined, corresponding to one-, two-, and three-dimensional Li-ion conduction pathways. Under these conditions, the discharge capacity exhibited a clear dependence on conduction-path dimensionality: as the dimensionality decreased, the capacity increasingly deviated from the ideal linear dependence on current density and showed pronounced nonlinearity. All rate behaviors were accurately described using a stretched-exponential relation, enabling quantitative characterization with two independent parameters, α and β. The parameter α defines the characteristic current scale at which capacity fade becomes apparent and correlates with the diffusion coefficient and particle size, reflecting the effective kinetic rate of Li-ion transport. In contrast, β governs the shape of capacity-retention curve and increases systematically with the effective dimensionality of Li-ion conduction pathways, indicating enhanced transport homogeneity. These results demonstrate that rate capability is governed not only by diffusion speed but also by the dimensionality and heterogeneity of Li-ion transport pathways. The proposed α–β framework provides a unified basis for comparing intrinsic rate performance across materials.

在本研究中，使用稀释电极方法系统地研究了锂插入材料的固有速率能力，该方法最大限度地减少了电解质传输限制并隔离了固态锂离子传输。研究了七种具有橄榄石、层状和尖晶石结构的代表性化合物，分别对应于一维、二维和三维锂离子传导途径。在这些条件下，放电容量明显依赖于电导路径维数，随着维数的减小，放电容量逐渐偏离理想的与电流密度的线性关系，呈现出明显的非线性。所有的速率行为都使用拉伸指数关系准确地描述，可以用两个独立的参数α和β进行定量表征。参数α定义了容量衰减明显的特征电流尺度，并与扩散系数和粒径相关，反映了锂离子输运的有效动力学速率。相比之下，β控制着容量保持曲线的形状，并随着锂离子传导途径有效维数的增加而系统地增加，表明输运均匀性增强。这些结果表明，速率能力不仅受扩散速度的影响，还受锂离子输运途径的维度和非均质性的影响。提出的α -β框架为比较不同材料的本征率性能提供了统一的基础。

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引用次数: 0