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ACS Applied Materials & Interfaces

ACS Applied Materials & Interfaces

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Zwitterionic Polymer Binder Networks with Structural Locking and Ionic Regulation Functions for High Performance Silicon Anodes

Published:12 December 2024 DOI: 10.1021/acsami.4c16492 PMID: 39666675
Jiangpu Yang,?Yunpeng Qu,?Borui Li,?Wanyuan Jiang,?Chang Su,?Mengfan Pei,?Runyue Mao,?Shuo Zhuo,?Xigao Jian,?Fangyuan Hu

Abstract

The silicon anode suffers from significant volume expansion, low electrical conductivity, and poor long-term cycling performance, which collectively limit its potential to replace graphite as the anode material for lithium-ion batteries. In this article, a PAA-p(HEA-SBMA) binder was prepared by an in situ thermal cross-linking method, which combines strong mechanical properties and excellent reaction kinetics. The synergy of covalent bonding, dynamic hydrogen bonding, and ionic interactions in the binder structure provides excellent mechanical strength, which effectively dissipates stresses and "locks" the entire structure. In addition, the zwitterionic monomers in the binder structure improve the transport of lithium-ions and promote lithium salt dissociation, which helps to establish a stable solid electrolyte interphase (SEI). Thanks to the structural locking mechanism and dynamic ionic regulation function, the PAA-p(HEA-SBMA) binder exhibited a long cycling performance. Even after 1000 cycles at 0.5 C, it still has a discharge capacity of 981.63 mAh g-1. The multifunctional binder designs in this work provide insights into the advancement of high energy density lithium-ion batteries.

Substances (2)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Poly(acrylic acid) 9003-01-4 C5H10O2 622 suppliers $12.00-$2250.00
2-(Dimethylamino)ethyl methacrylate 2867-47-2 C8H15NO2 291 suppliers $14.00-$1600.00
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