Zn2+–Imidazole Coordination Crosslinks for Elastic Polymeric Binders in High‐Capacity Silicon Electrodes,Advanced Science

当前位置： X-MOL 学术 › Adv. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Zn2+–Imidazole Coordination Crosslinks for Elastic Polymeric Binders in High‐Capacity Silicon Electrodes
Advanced Science ( IF 14.3 ) Pub Date : 2021-03-02 , DOI: 10.1002/advs.202004290
Jaemin Kim ₁ , Kiho Park ₁ , Yunshik Cho ₁ , Hyuksoo Shin ₁ , Sungchan Kim ₁ , Kookheon Char ₁ , Jang Wook Choi _{1,

2}

Affiliation

Recent research has built a consensus that the binder plays a key role in the performance of high‐capacity silicon anodes in lithium‐ion batteries. These anodes necessitate the use of a binder to maintain the electrode integrity during the immense volume change of silicon during cycling. Here, Zn²⁺–imidazole coordination crosslinks that are formed to carboxymethyl cellulose backbones in situ during electrode fabrication are reported. The recoverable nature of Zn²⁺–imidazole coordination bonds and the flexibility of the poly(ethylene glycol) chains are jointly responsible for the high elasticity of the binder network. The high elasticity tightens interparticle contacts and sustains the electrode integrity, both of which are beneficial for long‐term cyclability. These electrodes, with their commercial levels of areal capacities, exhibit superior cycle life in full‐cells paired with LiNi_0.8Co_0.15Al_0.05O₂ cathodes. The present study underlines the importance of highly reversible metal ion‐ligand coordination chemistries for binders intended for high capacity alloying‐based electrodes.

中文翻译：

高容量硅电极中弹性聚合物粘合剂的 Zn2+-咪唑配位交联

最近的研究已经达成共识，即粘合剂在锂离子电池高容量硅负极的性能中起着关键作用。这些阳极需要使用粘合剂来在循环过程中硅的巨大体积变化期间保持电极完整性。在此，报道了电极制造过程中在原位形成的羧甲基纤维素主链上的 Zn ²⁺ -咪唑配位交联。 Zn ²⁺ -咪唑配位键的可恢复性和聚乙二醇链的柔性共同决定了粘合剂网络的高弹性。高弹性可拉紧颗粒间接触并维持电极完整性，这两者都有利于长期循环性能。这些电极具有商业水平的面积容量，在与 LiNi _0.8 Co _0.15 Al _0.05 O ₂阴极配对的全电池中表现出优异的循环寿命。本研究强调了高度可逆的金属离子配体配位化学对于用于高容量合金电极的粘合剂的重要性。

更新日期：2021-05-05

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11