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用于高容量硅电极中弹性聚合物粘合剂的锌-咪唑配位交联

Zn-Imidazole Coordination Crosslinks for Elastic Polymeric Binders in High-Capacity Silicon Electrodes.

作者信息

Kim Jaemin, Park Kiho, Cho Yunshik, Shin Hyuksoo, Kim Sungchan, Char Kookheon, Choi Jang Wook

机构信息

School of Chemical and Biological Engineering and Institute of Chemical Process Seoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea.

Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea.

出版信息

Adv Sci (Weinh). 2021 Mar 2;8(9):2004290. doi: 10.1002/advs.202004290. eCollection 2021 May.

DOI:10.1002/advs.202004290
PMID:33977065
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8097348/
Abstract

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, Zn-imidazole coordination crosslinks that are formed to carboxymethyl cellulose backbones in situ during electrode fabrication are reported. The recoverable nature of Zn-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 LiNiCoAlO cathodes. The present study underlines the importance of highly reversible metal ion-ligand coordination chemistries for binders intended for high capacity alloying-based electrodes.

摘要

最近的研究已达成共识，即粘结剂在锂离子电池高容量硅阳极的性能中起着关键作用。这些阳极需要使用粘结剂，以在循环过程中硅发生巨大体积变化时保持电极的完整性。在此，报道了在电极制造过程中原位形成于羧甲基纤维素主链上的锌-咪唑配位交联。锌-咪唑配位键的可恢复性和聚乙二醇链的柔韧性共同导致了粘结剂网络的高弹性。高弹性增强了颗粒间的接触并维持了电极的完整性，这两者都有利于长期循环稳定性。这些具有商业面积容量水平的电极，在与LiNiCoAlO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基电极的粘结剂的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/04b641281d9a/ADVS-8-2004290-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/9b8621619e78/ADVS-8-2004290-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/4ae1c58df8ee/ADVS-8-2004290-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/e61fe58aaff7/ADVS-8-2004290-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/04b641281d9a/ADVS-8-2004290-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/9b8621619e78/ADVS-8-2004290-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/d9c6f91f405e/ADVS-8-2004290-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/6936e4486d0b/ADVS-8-2004290-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/83a6f41e73a1/ADVS-8-2004290-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/4ae1c58df8ee/ADVS-8-2004290-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/e61fe58aaff7/ADVS-8-2004290-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4402/8097348/04b641281d9a/ADVS-8-2004290-g007.jpg

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