Anodic Solid Electrolyte Interphase Formed around the Li2OHBr/ LiCoO2 Interface

Keisuke Yoshikawa

doi:10.1021/acsaem.2c04103

2023-04-14

DOI：10.1021/acsaem.2c04103

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摘要

En 中文

4 V-class oxide-based all-solid-state batteries, Li/ Li2OHBr/LiCoO2, are prepared using ductile antiperovskitestructured Li2OHBr via room-temperature densification. The effects of anodic decomposition of Li2OHBr on the LiCoO2/ Li2OHBr interfacial resistance and charge???discharge stabilities are investigated. Li2OHBr decomposes on LiCoO2 at 3.6 V vs. Li/Li+, and an irreversible charging capacity is observed in the first cycle. This anodic decomposition does not increase the resistance at the LiCoO2/Li2OHBr interface and in Li2OHBr. Transmission electron microscopy analysis shows an anodic-decomposed region of Li2OHBr with a thickness of ???30 nm between the LiCoO2 and Li2OHBr phases. This thickness is almost consistent with the expected value assuming a one- to two-electron anodic decomposition reaction of Li2OHBr. The resulting solid electrolyte interphase will have acceptable Li+ conductivity and improves the adhesion of the interface. The surface coating of amorphous lithium phosphate stabilizes charge???discharge reactions probably by suppressing proton insertion into LiCoO2.

Keyword:

all-solid-state battery

interface

Li2OHBr

solid electrolyte interphase

thin film

期刊

ACS Applied Energy Materials

IF:

5.5

论文数:

1.1W

被引数:

4.5W

机构

Nagoya University

学者数:

3.3W

论文数: 2.5W

被引数: 2.6W

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