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In situ preparation of an advanced binder with a triple-crosslinking network for high-performance silicon anodes.

Authors :
Qin, Yu
Jiang, Haowen
Cai, Kanghui
Liu, Zhenzhen
Su, Jing
Lv, Xiaoyan
Wen, Yanxuan
Source :
Journal of Alloys & Compounds. May2024, Vol. 983, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

Silicon serves as a promising anode material for lithium-ion batteries. However, silicon suffers from low initial coulombic efficiency (ICE) and poor cycling performance due to large volume change, lithium consumption, the formation of a solid-electrolyte interphase (SEI), and low conductivity. To improve the performance of silicon anodes, this work proposed a new strategy for the design of silicon electrode binders based on β -cyclodextrin, citric acid, and sodium alginate, where a binder with a chemical/ionic/hydrogen-bonded triple-crosslinked network was constructed in situ during electrode preparation. The binder with a triple-crosslinked network provided the silicon electrode with a high binding strength, excellent ion/electron permeation network, and robust interfacial protective layer, providing better tolerate volume changes, and inhibiting the interfacial side reactions and the formation of solid-electrolyte interphase, as well as accelerating Li+ diffusion during the charge/discharge processes. The prepared silicon electrodes had a higher ICE (92.8%), better cycling stability (1429 mAh/g after 400 cycles at 0.5 C), and superior rate performance (1274 mAh/g at 4 C). This work may guide the design of high-performance binders for silicon electrodes. [Display omitted] • Si@ACD was prepared in situ with a triple crosslinked network on the copper. • Si@ACD was prepared at a low amount of binder (10 wt%) and carbon black (10 wt%). • Si@ACD has a better ionic/electronic transport network and a robust and stable SEI. • Si@ACD has higher ICE (92.8%) and superior rate performance (1274 mAh/g at 4 C). • Si@ACD exhibits better cyclic stability (1429 mAh/g after 400 cycles at 0.5 C). [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09258388
Volume :
983
Database :
Academic Search Index
Journal :
Journal of Alloys & Compounds
Publication Type :
Academic Journal
Accession number :
175696891
Full Text :
https://doi.org/10.1016/j.jallcom.2024.173869