阳极
化学工程
化学
复合材料
高分子化学
材料科学
电极
物理化学
工程类
作者
Zhu Liu,Yongming Wang,Guoquan Liu,Xinyang Yue,Zhangqin Shi,Yi‐Hong Tan,Jun Zhao,Lei Yu,Xuzhou Yan,Zheng Liang
摘要
Mechanical fatigue of the binders during the repeated volume change of Si-based anodes induces binder network collapse, resulting in lithium-ion batteries (LIBs) failing prematurely. Herein, we designed a damageless polymer binder with a mechanically interlocked network utilizing [an]daisy chains (DCMIN) and poly(acrylic acid) (PAA) to improve the structural cohesion of the Si-based anode. This DCMIN@PAA binder exhibits robust mechanical properties, high elasticity, and excellent adhesion. More importantly, the recognition between the dialkylammonium salt decorated on the thread component and the ether group of benzo-24-crown-8 provides efficacy for the DCMIN@PAA binder in quickly dissipating energy and reducing damage accumulation. Therefore, with the DCMIN@PAA binder, the pure-Si anode showcases high retention over 1050 cycles at 1 C and a fast rate response (5 C). The DCMIN@PAA binder also improves the cycling stability of the homemade pouch cell using a pure-Si anode. In addition, the water-soluble DCMIN@PAA binder, capable of quick release and separation, could facilitate recycling of the end-of-life anode, enhancing the sustainability of the battery. This work highlights the indispensability of energy dissipation with the consideration of a binder and provides a viable path forward to stabilize Si-based anodes suffering from volume change-induced stress accumulation.
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