Chen Jiaxin, Hu Kangjia, Wang Zhangci, Xu Henghui, Huang Yunhui, Hu Xianluo
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Small. 2025 Feb;21(6):e2410118. doi: 10.1002/smll.202410118. Epub 2024 Dec 26.
Micro-sized silicon (µSi) anodes are an attractive alternative to graphite for high-energy lithium-ion batteries (LIBs) due to their low cost and high specific capacity. However, they suffer from severe volume expansion during lithiation, leading to fast capacity decay and poor rate capability. Herein, a new hybrid binder featuring a cross-linked conductive network and multiple hydrogen bonds for µSi anodes with high areal capacity is reported. This binder demonstrates multi-scale synergistic effects, including robust binder-derived solid electrolyte interphase, multiple networks to mitigate electrode pulverization and efficient ion/electron transfer pathways. As a result, the µSi anodes exhibit long-term cyclability and exceptional rate performance, achieving a high specific capacity of 1481.3 mAh g at 12 A g and maintaining 960.5 mAh g at 20 A g. When paired with the LiNiCoMnO (NCM811) cathode, the µSi||NCM811 full cell delivers an impressive capacity of 145.8 mAh g under fast 6C charging conditions, along with high Coulombic efficiency during cycling. This research presents an effective strategy for enabling fast charging and stable cycling in high-energy µSi-based LIBs.
微尺寸硅（µSi）阳极因其低成本和高比容量，是用于高能锂离子电池（LIB）的石墨的一种有吸引力的替代品。然而，它们在锂化过程中会发生严重的体积膨胀，导致快速的容量衰减和较差的倍率性能。在此，报道了一种用于具有高面积容量的µSi阳极的新型混合粘结剂，其具有交联导电网络和多个氢键。这种粘结剂表现出多尺度协同效应，包括坚固的粘结剂衍生的固体电解质界面、多个网络以减轻电极粉化以及有效的离子/电子传输途径。结果，µSi阳极表现出长期循环稳定性和出色的倍率性能，在12 A g下实现了1481.3 mAh g的高比容量，在20 A g下保持960.5 mAh g。当与LiNiCoMnO（NCM811）阴极配对时，µSi||NCM811全电池在快速6C充电条件下提供了令人印象深刻的145.8 mAh g的容量，以及循环过程中的高库仑效率。这项研究提出了一种在高能µSi基LIB中实现快速充电和稳定循环的有效策略。
