Mechanically and Thermally Stable Cathode Electrolyte Interphase Enables High‐temperature, High‐voltage Li||LiCoO2 Batteries

Daxiong Wu; Chunlei Zhu; Huaping Wang; Junda Huang; Gaoxue Jiang; Yulu Yang; Gaojing Yang; Dongliang Tang; Jianmin Ma

doi:10.1002/ange.202315608

journal article Dec 29, 2023

Mechanically and Thermally Stable Cathode Electrolyte Interphase Enables High‐temperature, High‐voltage Li||LiCoO2 Batteries

Daxiong Wu

Chunlei Zhu Huaping Wang

Junda Huang Gaoxue Jiang Yulu Yang Gaojing Yang

Dongliang Tang Jianmin Ma

Angewandte Chemie Vol. 136 No. 7 · Wiley

View at Publisher Save 10.1002/ange.202315608

Abstract

AbstractThe development of high‐energy‐density Li||LiCoO2 batteries is severely limited by the instability of cathode electrolyte interphase (CEI) at high voltage and high temperature. Here we propose a mechanically and thermally stable CEI by electrolyte designing for achieving the exceptional performance of Li||LiCoO2 batteries at 4.6 V and 70 °C. 2,4,6‐tris(3,4,5‐trifluorophenyl)boroxin (TTFPB) as the additive could preferentially enter into the first shell structure of PF6− solvation and be decomposed on LiCoO2 surface at low oxidation potential to generate a LiBxOy‐rich/LiF‐rich CEI. The LiBxOy surface layer effectively maintained the integrity of CEI and provided excellent mechanical and thermal stability while abundant LiF in CEI further improved the thermal stability and homogeneity of CEI. Such CEI drastically alleviated the crack and regeneration of CEI and irreversible phase transformation of the cathode. As expected, the Li||LiCoO2 batteries with the tailored CEI achieved 91.9 % and 74.0 % capacity retention after 200 and 150 cycles at 4.6 and 4.7 V, respectively. Moreover, such batteries also delivered an unprecedented high‐temperature performance with 73.6 % capacity retention after 100 cycles at 70 °C and 4.6 V.

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Details

Published: Dec 29, 2023
Vol/Issue: 136(7)
License: View

Authors

D

Daxiong Wu

School of Chemistry Tiangong University 300387 Tianjin P. R. China; School of Physics and Electronics Hunan University 410082 Changsha P. R. China

C

Chunlei Zhu