Preparation of LiNi_1/3Mn_1/3Co_1/3O₂/Li₃PS₄ cathode composite particles using a new liquid-phase process and application to all-solid-state lithium batteries

Abstract

The sulfide based electrolyte Li₃PS₄ was directly produced on the cathode active materials LiNi_1/3Mn_1/3Co_1/3O₂ (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 β-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·10Li₃PS₄ by SEED composite | Li₃PS₄ | 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.