Rate-Dependent Failure Behavior Regulation of LiFePO4 Cathode via Functional Interface Engineering

Rui Tang, Jinyang Dong*, Chengzhi Wang, Yibiao Guan, Aining Yin, Kang Yan, Yun Lu, Ning Li, Guangjin Zhao, Bowen Li, Wenjun Shen, Feng Wu, Yuefeng Su*, Lai Chen*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

LiFePO4 is extensively used as a cathode material in lithium-ion batteries because of its high safety profile, affordability, and extended cycle life. Nevertheless, its inherently low lithium-ion transport kinetics and restricted electronic conductivity considerably limit its rate performance. Furthermore, the failure mechanisms specific to various cycling rates are not well examined. This study presents a functional interface layer designed to regulate the rate-dependent failure behavior of LiFePO4. At elevated charge/discharge rates, this layer facilitates lithium-ion mobility, decreases internal polarization, alleviates mechanical stress, and reduces structural degradation. At lower cycling rates, it contributes to the formation of a stable cathode-electrolyte interphase (CEI), effectively suppressing side reactions and minimizing active lithium loss. Consequently, the modified LiFePO4 demonstrates enhanced cycling stability and capacity retention, with capacity retention after 400 cycles at 2C rate increasing from 76.5% to 98.6% and at 5C increasing from 40.2% to 90.0%. Through combinations of experimental data and theoretical analysis, this study elucidates key mechanisms underlying rate-specific failure regulation, providing valuable insights into the relationship between ion transport dynamics and structural stability. This approach represents an effective strategy for supporting its potential use in advanced energy storage systems that require both rapid charging and prolonged cycling stability.

源语言英语
期刊Advanced Functional Materials
DOI
出版状态已接受/待刊 - 2025

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Tang, R., Dong, J., Wang, C., Guan, Y., Yin, A., Yan, K., Lu, Y., Li, N., Zhao, G., Li, B., Shen, W., Wu, F., Su, Y., & Chen, L. (已接受/印刷中). Rate-Dependent Failure Behavior Regulation of LiFePO4 Cathode via Functional Interface Engineering. Advanced Functional Materials. https://doi.org/10.1002/adfm.202421284