材料科学
阳极
硅
锂(药物)
阳极连接
复合材料
电极
化学工程
氢键
消散
纳米技术
光电子学
分子
有机化学
热力学
化学
物理化学
内分泌学
工程类
物理
医学
作者
Linlin Hu,Xudong Zhang,Peiyu Zhao,Hao Fan,Zhen Zhang,Junkai Deng,Goran Ungar,Jiangxuan Song
标识
DOI:10.1002/adma.202104416
摘要
Alleviating large stress is critical for high-energy batteries with large volume change upon cycling, yet this still presents a challenge. Here, a gradient hydrogen-bonding binder is reported for high-capacity silicon-based anodes that are highly desirable for the next-generation lithium-ion batteries. The well-defined gradient hydrogen bonds, with a successive bond energy of -2.88- -10.04 kcal mol-1 , can effectively release the large stress of silicon via the sequential bonding cleavage. This can avoid recurrently abrupt structure fracture of traditional binder due to lack of gradient energy dissipation. Certainly, this regulated binder endows stable high-areal-capacity silicon-based electrodes >4 mAh cm-2 . Beyond proof of concept, this work demonstrates a 2 Ah silicon-based pouch cell with an impressive capacity retention of 80.2% after 700 cycles (0.028% decay/cycle) based on this gradient hydrogen-bonding binder, making it more promising for practical application.
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