Improved Cycling Stability of LiCoO2 at 4.5 V via Surface Modification of Electrodes with Conductive Amorphous LLTO Thin Film

Shipai SONG, Xiang PENG, Kai HUANG, Hao ZHANG, Fang WU, Yong XIANG, Xiaokun ZHANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

11 Citations (Scopus)

Abstract

The stability issue of LiCoO2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO2 via coating individual LiCoO2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li0.33La0.56TiO3, one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO2 electrodes through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO2 electrodes was retained, but also the Li+ transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO2 electrodes suggests that most of the stability issues can be addressed via the deposition of amorphous Li0.33La0.56TiO3. With an optimized deposition time, the LiCoO2 electrodes modified by Li0.33La0.56TiO3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cutoff voltage from 2.75 to 4.5 V vs. Li+/Li and an 84.6% capacity gain at 5 C comparing with the pristine one.

Original languageEnglish
Article number110
Number of pages10
JournalNanoscale Research Letters
Volume15
Issue number1
Early online date14 May 2020
DOIs
Publication statusPublished - Dec 2020
Externally publishedYes

Bibliographical note

This work is supported by the National Science Funds of China (grant no. 21905040), the startup funds from the University of Electronic Science and Technology of China, and the National Key Research and Development Program of China (2017YFB0702802).

Keywords

  • Cycling stability
  • High voltage
  • LiCoO
  • Lithium ion batteries
  • Surface modification

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