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Amorphous Ni‐Rich Li(Ni 1− x − y Mn x Co y )O 2 –Li 2 SO 4 Positive Electrode Materials for Bulk‐Type All‐Oxide Solid‐State Batteries
Author(s) -
Nagao Kenji,
Sakuda Atsushi,
Hayashi Akitoshi,
Tsukasaki Hirofumi,
Mori Shigeo,
Tatsumisago Masahiro
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201802016
Subject(s) - materials science , amorphous solid , electrode , electrolyte , oxide , solid solution , fast ion conductor , analytical chemistry (journal) , chemical engineering , metallurgy , crystallography , chemistry , chromatography , engineering
All‐solid‐state batteries attract significant attention owing to their potential to realize an energy storage system with high safety and energy density. In this paper, a mechanochemical synthesis of novel amorphous positive electrode materials of the Ni‐rich LiNi 1− x − y Mn x Co y O 2 (NMC)–Li 2 SO 4 system suitable for oxide‐type all‐solid‐state batteries is reported. Through the mechanochemical treatment with Li 2 SO 4 , excellent formabilities of the electrode materials as those of ductile solid electrolytes are obtained. Owing to the deformability of the active material, a good electrode/electrolyte interface is provided simply by pressing at room temperature. In all‐oxide solid‐state cells using 80NMCs·20Li 2 SO 4 (mol%) positive electrode materials, the cell capacity increases with the Ni content in the NMC. The all‐solid‐state cell using the 80NMC811·20Li 2 SO 4 positive electrode active material exhibits a high capacity larger than 250 mAh g −1 in a voltage range of 1.6–4.8 V versus Li at 100 °C. Furthermore, bulk‐type all‐oxide solid‐state batteries (Li 4 Ti 5 O 12 /80NMC532·20Li 2 SO 4 (mol%)) successfully function as secondary batteries with excellent cycle performances.