首页|过渡金属比例对锂离子电池LiNixCoyMnzO2层状材料电化学性能及热特性的影响

过渡金属比例对锂离子电池LiNixCoyMnzO2层状材料电化学性能及热特性的影响

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为了揭示LiNixCoyMnzO2(NCM)的性能随过渡金属(TM)成分的变化规律,系统研究TM比例对不同NCM材料的结构、形貌、电化学性能和热行为的影响.镍含量的增加能够提高可逆容量,但速率性能和循环稳定性变差.在富镍NCM中,Li+的动力学抑制和电子导电性差是容量损失的主要原因.通过原位和非原位微量热法对不同NCM的热行为进行对比.结果表明,随着Ni含量的降低,材料的热稳定性显著提高.通过对NCM中Li剩余量的分析,对相变相关的氧释放量进行评估.结果表明,富镍材料在脱锂后出现更严重的结构恶化,起始温度更低,热释放量更多.综合表征表明,LiNi0.5Co0.3Mn0.2O2在电化学性能和安全性能间实现良好的平衡.
Role of transition metal ratio on electrochemical and thermal properties of LiNixCoyMnzO2 layered materials for lithium-ion batteries
To reveal how the performance of LiNixCoyMnzO2(NCM)changes as a function of transition metal(TM)composition,the effect of TM ratio on the structure,morphology,electrochemical performance and thermal behavior of different NCMs was systematically investigated.Increasing Ni content leads to higher reversible capacity but worse rate capability and cycling stability.Inhibited kinetics of Li+and poor electronic conductivity cause major capacity loss in Ni-rich NCMs.Comparison of thermal behaviors was carried out via in-situ and ex-situ micro-calorimetry.With the decrease of Ni content,the thermal stability is significantly improved.The oxygen release related to phase transitions was evaluated based on Li residuals in delithiated NCMs,which verifies that Ni-rich materials exhibit severer structural deterioration,lower onset temperature and more heat release.Comprehensive characterization identifies that LiNi0.5Co0.3Mn0.2O2 strikes a well-balanced combination of electrochemical performance and safety features.

lithium-nickel-cobalt manganese oxidethermal stabilitystructural evolutionternary materiallithium ion battery safety

梁晨、童邦、李师、魏泽森、孙金华、王青松

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常州大学石油和化工行业动力电池安全与事故防控技术工程实验室,常州 213164

常州大学 安全科学与工程学院,常州 213164

中国科学技术大学火灾科学国家重点实验室,合肥 230026

合肥国轩高科动力能源有限公司,合肥 230016

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镍钴锰酸锂 热稳定性 结构演变 三元材料 锂离子电池安全

National Natural Science Foundation of ChinaEngineering Laboratory of Battery Safety and Accident Control of Petroleum and Chemical Industry,ChinaYouth Innovation Promotion Association,Chinese Academy of Sciences

U2033204ELBSAC202304Y201768

2024

10.1016/S1003-6326(24)66517-9

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(6)
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