Preparation of sintering-free non-crystalline Li2B4O7 ceramics for Li-ion battery’s binder

Abstract

Abstract Li–B–O materials are used as binders for all solid-state lithium-ion batteries (LIBs). We obtained amorphous Li2B4O7 powder by heating treatment of precursor powder synthesized from Li(OAc)·2H2O, H3BO3, and DL-malic acid by solution method. Thermogravimetric differential thermal analysis results showed that crystallization of the precursor powder occurred at around 500 °C. Therefore, heating treatment was performed below 500 °C. As a result, the amorphous powder was obtained under the heating treatment conditions of 400 °C for 1 h in air. The obtained powder has softness and dense pellet was prepared by uniaxial pressure molding at RT. This material can be used for all solid-state LIBs as a new binder.