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In situ transmission electron microscopy observation of electrochemical behavior of CoS in lithium-ion battery

ACS Applied Materials and Interfaces, ISSN: 1944-8244, Vol: 6, Issue: 4, Page: 3016-3022
2014
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Article Description

Metal sulfides are a type of potential anode materials for lithium-ion batteries (LIBs). However, their electrochemical behaviors and mechanism during the charge and discharge process remain unclear. In the present paper, we use CoS as a model material to investigate their electrochemical process using in situ transmission electron microscopy (TEM). Two kinds of reaction behaviors are revealed. The pure CoS particles show a side-to-side conversion process, in which large and anisotropic size expansion (47.1%) occurs that results in the formation of cracks and fractures in CoS particles. In contrast, the CoS particles anchored on reduced graphene oxide (rGO) sheets exhibit a core-shell conversion process involving small and homogeneous size expansion (28.6%) and few fractures, which attributes to the excellent Li conductivity of rGO sheets and accounts for the improved cyclability. Single-crystalline CoS particle converts to Co nanocrystals of 1-2 nm embedded within LiS matrix after the first lithiation. The subsequent electrochemical reaction is a reversible phase conversion between Co/LiS and CoS nanocrystals. Our direct observations provide important mechanistic insight for developing high-performance conversion electrodes for LIBs. © 2014 American Chemical Society.

Bibliographic Details

Su, Qingmei; Xie, Jian; Zhang, Jun; Zhong, Yijun; Du, Gaohui; Xu, Bingshe

American Chemical Society (ACS)

Materials Science

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