Preparation of LiNi1/3Mn1/3Co1/3O2/Li3PS4 cathode composite particles using a new liquid-phase process and application to all-solid-state lithium batteries

The sulfide based electrolyte Li3PS4 was directly produced on the cathode active materials LiNi1/3Mn1/3Co1/3O2 (NMC) using the SEED method which was a new liquid-phase process developed by applying liquid-phase shaking method. The generation of PS43- unit in the SEED process was confirmed by in-situ Raman spectroscopy measurement. The generation of beta-Li3PS4 on NMC was shown using X-ray elemental mapping, transmission electron microscope observation and electron diffraction analysis. An all-solid-state cell composed of [90NMC center dot 10Li(3)PS(4) by SEED composite vertical bar Li3PS4 vertical bar In] was fabricated. It showed promising charge-discharge cycle performance, which could be ascribed to good retention of electrochemical contact at the interface between NMC and the electrolyte during the cycling. (C) 2018 The Ceramic Society of Japan. All rights reserved.