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Room-Temperature Rapid Self-Healing Polymer Binders for Si Anodes in Highly Cycling-Stable and Capacity-Maintained Lithium-Ion Batteries
Wang, Fei1; Ma, Xiang1; Li, Yiren2; Liu, Hongmei1; Wu, Qingping3; Guan, Xiang4; Liu, Hui5; Wang, Xiao Xia6; Xu, Jun1
2023-03-27
摘要Silicon (Si) with high specific capacity has received increasing attention for rechargeable battery anode materials. However, particle pulverization as a result of the large volume expansion of Si anodes further aggravated electrochemical performance degradation during the process of charging and discharging. In this work, we report the room-temperature rapid self-healing polymer binders (Al/Alg-TUEG) synthesized via dynamic coordination bonds (Al-O) and hydrogen bonds from poly(etherthioureas) (TUEG). The prepared polymer binders exhibit a peeling force of 4.2 N, a swelling ratio of 9.5%, and a recovery of 90% in 2 h at room temperature. As a result, the Si@Al/Alg-TUEG anodes stably cycle for 300 cycles at 0.5 C with a capacity retention rate of 77.4%. A high initial Coulombic efficiency (CE) of 87.2% and good rate performance are also achieved. In terms of full cell performance, both LiFePO4//Si@Al/Alg-TUEG and NCM811//Si@Al/Alg-TUEG display stable cycling for 100 cycles at 0.5 C. The capacity retention of both full cells reaches 93.8 and 92.5%. Good recoverability at high rates is also found. The superior electrochemical performance of the Si anode indicates that Al/Alg-TUEG polymer with rapid self-healing capability at room-temperature is one of the promising binder candidates for next-generation high-energy-density lithium-ion batteries.
关键词lithium-ion battery polymer binder silicon anode self-healing full cell
DOI10.1021/acsaem.3c001613538
发表期刊ACS APPLIED ENERGY MATERIALS
ISSN2574-0962
卷号6期号:6页码:3538-3548
通讯作者Wang, Xiao Xia(wangxiaoxia@ecust.edu.cn) ; Xu, Jun(xujun@ecust.edu.cn)
收录类别SCI
WOS记录号WOS:001047293300001
语种英语