POSITIVE ELECTRODE FOR ALL-SOLID BATTERY, AND ALL-SOLID BATTERY

• Main Authors: KINOSHITA SHUNJI, OKUMURA TAKURO, OKAMOTO HIDETAKE
• Format: Patent
• Language: English; Japanese
• Published: 31.05.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a positive electrode for an all-solid battery, which enables the reduction in interface resistance of each positive electrode active material particle and a solid electrolyte on condition that Li-excess positive electrode active material particles are used in a positive electrode of an all-solid battery.SOLUTION: A positive electrode 2 for an all-solid battery comprises a positive electrode mixture layer 2a. The positive electrode mixture layer 2a includes complex particles including positive electrode active material particles, and oxide particles deposited on the surface of the positive electrode active material particles, and a solid electrolyte. The positive electrode active material particles include a solid solution represented by the following formula: Li(MeM)O(where Me represents a first metal element; M represents a second metal element smaller than the first metal element in average valence; and x and y satisfy 0<x≤1/3 and 0.5≤y≤0.8). The oxide particles include a Zr-containing metal oxide.SELECTED DRAWING: Figure 1 【課題】全固体電池の正極において、Ｌｉ過剰の正極活物質粒子を用いる際の、正極活物質粒子と固体電解質との界面抵抗を低減できる全固体電池用正極の提供。【解決手段】正極合材層２ａを含み、正極合材層２ａは、正極活物質粒子と、前記正極活物質粒子の表面に付着した酸化物粒子とを含む複合粒子、及び固体電解質を含み、前記正極活物質粒子が、式：Ｌｉ１＋ｘ（ＭｅｙＭ１−ｙ）１−ｘＯ２（Ｍｅは、第１金属元素；Ｍは第１金属元素より平均価数が低い第２金属元素；ｘ及びｙは０＜ｘ≦１／３および０．５≦ｙ≦０．８を充足する。）で表される固溶体を含み、前記酸化物粒子は、Ｚｒを含む金属酸化物を含む全固体電池用正極２。【選択図】図１