Gradient H-Bonding Binder Enables Stable High-Areal-Capacity Si-Based Anodes in Pouch Cells

被引：153

作者：

Hu, Linlin ^{[1
]}

Zhang, Xudong ^{[2
]}

Zhao, Peiyu ^{[1
]}

Fan, Hao ^{[1
]}

Zhang, Zhen ^{[1
]}

Deng, Junkai ^{[1
]}

Ungar, Goran ^{[1
]}

Song, Jiangxuan ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Shaanxi Int Res Ctr Soft Matter, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, Network Informat Ctr, Ctr High Performance Comp, Xian 710049, Peoples R China

来源：

ADVANCED MATERIALS | 2021年 / 33卷 / 52期

基金：

中国国家自然科学基金;

关键词：

lithium-ion batteries; silicon-based anodes; high-energy-dissipation binders; gradient hydrogen bonding; pouch cells; SILICON MICROPARTICLE ANODES; CONDUCTIVE POLYMER BINDER; NEGATIVE ELECTRODES; POROUS SILICON; ION; BATTERY;

D O I：

10.1002/adma.202104416

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页数：9

共 63 条

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