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The effect of electrochemical cycling on the strength of LiCoO 2
Author(s) -
Feng Lin,
Lu Xuefeng,
Zhao Tingting,
Dillon Shen
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15893
Subject(s) - nanopillar , materials science , cycling , electrochemistry , transmission electron microscopy , cathode , composite material , nanotechnology , electrode , chemistry , nanostructure , archaeology , history
This work utilizes in situ transmission electron microscopy–based nanopillar compression to investigate the effect of electrochemical cycling on the mechanical properties of LiCoO 2 . The ultimate strength of LiCoO 2 in the pristine state, and after 1 and 11 cycles are 5.62 ± 0.22 GP a, 3.91 ± 1.22 GP a, and 2.27 ± 1.07 GP a, respectively. The reduced average yield strengths and the large standard deviations of cycled samples, relative to the pristine powder, are hypothesized to result from nonuniform accumulation of Li + site‐point defects during cycling; either H + or Li + vacancies. Density functional theory calculations support our hypothesized link between a nonuniform Li site‐point defect distribution in the cathode and reduction in the materials cohesive strength.