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Constructing a Resilient Hierarchical Conductive Network to Promote Cycling Stability of SiOx Anode via Binder Design
Small ( IF 13.3 ) Pub Date : 2021-09-15 , DOI: 10.1002/smll.202102256
Zhibo Song 1 , Shiming Chen 1 , Yan Zhao 2 , Shida Xue 1 , Guoyu Qian 1 , Jianjun Fang 1 , Taohang Zhang 1 , Chuanjiang Long 3 , Luyi Yang 1 , Feng Pan 1
Affiliation  

Despite exhibiting high specific capacities, Si-based anode materials suffer from poor cycle life as their volume change leads to the collapse of conductive network within the electrode. For this reason, the challenge lies in retaining the conductive network during electrochemical processes. Herein, to address this prominent issue, a cross-linked conductive binder (CCB) is designed for commercially available silicon oxides (SiOx) anode to construct a resilient hierarchical conductive network from two aspects: on the one hand, exhibiting high electronic conductivity, CCB serves as an adaptive secondary conductive network in addition to the stiff primary conductive network (e.g., conductive carbon), facilitating faster interfacial charge transfer processes for SiOx in molecular level; on the other hand, the cross-linked structure of CCB shows resilient mechanical properties, which maintains the integrity of the primary conductive network by preventing electrode deformation during prolonged cycling. With the aid of CCB, untreated micro-sized SiOx anode material delivers an areal capacity of 2.1 mAh cm−2 after 250 cycles at 0.8 A g−1. The binder design strategy, as well as, the relevant concepts proposed herein, provide a new perspective toward promoting the cycling stability of high-capacity Si-based anodes.

中文翻译:

通过粘合剂设计构建弹性分层导电网络以促进 SiOx 阳极的循环稳定性

尽管表现出高比容量,但硅基负极材料的循环寿命很短,因为它们的体积变化会导致电极内导电网络的崩溃。因此,挑战在于在电化学过程中保持导电网络。在此,针对这一突出问题,针对市售氧化硅(SiO x)阳极设计了一种交联导电粘合剂(CCB),以从两个方面构建弹性分层导电网络:一方面,表现出高电子导电性,除了坚硬的初级导电网络(例如导电碳)之外,CCB 还用作自适应次级导电网络,促进 SiO x更快的界面电荷转移过程分子水平;另一方面,CCB 的交联结构显示出弹性的机械性能,通过防止电极在长时间循环过程中变形来保持主要导电网络的完整性。在 CCB 的帮助下,未经处理的微型 SiO x负极材料在 0.8 A g -1 下循环 250 次后可提供 2.1 mAh cm -2的面积容量。粘合剂设计策略以及本文提出的相关概念为提高高容量硅基负极的循环稳定性提供了新的视角。
更新日期:2021-10-21
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