Issue 59, 2016, Issue in Progress

In situ study on the charge/discharge of nanocrystalline Li2C2 as a new cathode material

Abstract

The real-time charge and discharge processes of a single phase nanocrystalline Li2C2 alloy were directly observed by in situ transmission electron microscopy. Upon lithiation, nanocrystalline Li2C2 exhibits obvious volume expansion and morphology change, and an amorphous structure is generated from the nanocrystalline matrix. The change of structure affects the cycling stability of nanocrystalline Li2C2 as a cathode material. To reduce the effect of the structural change, the degree of delithiation was optimized by controlling the charge/discharge voltage range in the electrochemical tests. A high initial specific capacity of 352 mA h g−1 was obtained for nanocrystalline Li2C2, and a discharge capacity of 171 mA h g−1 was maintained after 50 cycles. The present work proposed a new alloy-type cathode material of nanocrystalline Li2C2 for lithium ion batteries with promising electrochemical performance.

Graphical abstract: In situ study on the charge/discharge of nanocrystalline Li2C2 as a new cathode material

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2016
Accepted
27 May 2016
First published
31 May 2016

RSC Adv., 2016,6, 54256-54262

In situ study on the charge/discharge of nanocrystalline Li2C2 as a new cathode material

Y. Li, X. Song, F. Tang, C. Hou, J. He, H. Wang and X. Liu, RSC Adv., 2016, 6, 54256 DOI: 10.1039/C6RA08990A

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