TY - JOUR
T1 - Rate-Dependent Failure Behavior Regulation of LiFePO4 Cathode via Functional Interface Engineering
AU - Tang, Rui
AU - Dong, Jinyang
AU - Wang, Chengzhi
AU - Guan, Yibiao
AU - Yin, Aining
AU - Yan, Kang
AU - Lu, Yun
AU - Li, Ning
AU - Zhao, Guangjin
AU - Li, Bowen
AU - Shen, Wenjun
AU - Wu, Feng
AU - Su, Yuefeng
AU - Chen, Lai
N1 - Publisher Copyright:
© 2025 Wiley-VCH GmbH.
PY - 2025
Y1 - 2025
N2 - 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.
AB - 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.
KW - failure behavior regulation
KW - failure mechanism
KW - interface engineering
KW - LiFePO
KW - rate-dependent
UR - http://www.scopus.com/inward/record.url?scp=85215701897&partnerID=8YFLogxK
U2 - 10.1002/adfm.202421284
DO - 10.1002/adfm.202421284
M3 - Article
AN - SCOPUS:85215701897
SN - 1616-301X
JO - Advanced Functional Materials
JF - Advanced Functional Materials
ER -