Minimized Lithium Trapping by Isovalent Isomorphism for High Initial Coulombic Efficiency of Silicon Anodes

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2019 Nov 26

PMID 31763449

Citations 9

Authors

Bin Zhu

Guoliang Liu

Guangxin Lv

Yu Mu

Yunlei Zhao

Yuxi Wang

Xiuqiang Li

Pengcheng Yao

Yu Deng

Yi Cui

Jia Zhu

Affiliations

Soon will be listed here.

Abstract

Silicon demonstrates great potential as a next-generation lithium ion battery anode because of high capacity and elemental abundance. However, the issue of low initial Coulombic efficiency needs to be addressed to enable large-scale applications. There are mainly two mechanisms for this lithium loss in the first cycle: the formation of the solid electrolyte interphase and lithium trapping in the electrode. The former has been heavily investigated while the latter has been largely neglected. Here, through both theoretical calculation and experimental study, we demonstrate that by introducing Ge substitution in Si with fine compositional control, the energy barrier of lithium diffusion will be greatly reduced because of the lattice expansion. This effect of isovalent isomorphism significantly reduces the Li trapping by ~70% and improves the initial Coulombic efficiency to over 90%. We expect that various systems of battery materials can benefit from this mechanism for fine-tuning their electrochemical behaviors.

Citing Articles

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