乾式コーティング技術を用いた電極活物質とイオン伝導材料の複合粒子の設計

抄録

In this review, a dry coating technology to produce composite electrode of an all-solid-state battery is presented. Firstly, from the view point of the dry powder mixing, fundamental concept of the dry coating is reviewed. Secondly, our recent progress in the dry coating technology for cathode active material and sulfide solid electrolyte is presented. The dry coating technology is applied to produce the core-shell structure composite particle composed of cathode active material particle (LiNi_1/3Co_1/3Mn_1/3O₂, NCM) and sulfide solid electrolyte (Li₃PS₄, LPS). We demonstrate that by means of a dry coating process single NCM particle is uniformly coated with LPS without any breakage and attrition of the NCM particle, i.e., NCM@LPS core-shell particle is able to be successfully produced. Finally, performance of the half-cell prepared with NCM@LPS particles is presented. A composite cathode prepared with NCM@LPS particles exhibits much larger contact area between NCM and LPS, resulting in significant improvement of performance of an all-solid-state half-cell.