ALL-SOLID BATTERY

• Main Authors: HASEGAWA KENTA, KUROMIYA TAKAO
• Format: Patent
• Language: English; Japanese
• Published: 09.08.2018
• 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 an all-solid battery which is small in environmental load, and which can achieve both of a high adhesion strength and superior battery characteristics.SOLUTION: An all-solid battery 100 comprises: a positive electrode layer 20 having a positive electrode current collector 6, and a positive electrode mixture layer 21 formed on the positive electrode current collector 6 and including at least a positive electrode active material 2 and a binder 4; a negative electrode layer 30 having a negative electrode current collector 7, and a negative electrode mixture layer 31 formed on the negative electrode current collector 7 and including at least a negative electrode active material 3 and a binder 4; and a solid electrolyte layer 40 disposed between the positive electrode mixture layer 21 and the negative electrode mixture layer 31 and including at least a solid electrolyte 1 having ion conductivity. The concentration of solvent included in at least one layer selected from a group consisting of the positive electrode mixture layer 21, the negative electrode mixture layer 31 and the solid electrolyte layer 40 is 50 ppm or less. The concentration of the binder 4 included in at least one layer selected from the positive electrode mixture layer 21 and the negative electrode mixture layer 31 in the vicinity of the solid electrolyte layer 40 is lower than that in the vicinity of the positive electrode current collector 6 or the negative electrode current collector 7.SELECTED DRAWING: Figure 1 【課題】環境負荷が小さく、かつ高い密着強度と優れた電池特性とを両立する全固体電池を提供する。【解決手段】全固体電池１００は、正極集電体６と、正極集電体６上に形成された、少なくとも正極活物質２およびバインダー４を含む正極合剤層２１とを備える正極層２０と、負極集電体７と、負極集電体７上に形成された、少なくとも負極活物質３およびバインダー４を含む負極合剤層３１とを備える負極層３０と、正極合剤層２１と負極合剤層３１との間に配置された、少なくともイオン伝導性を有する固体電解質１を含む固体電解質層１０と、を備え、正極合剤層２１、負極合剤層３１および固体電解質層４０よりなる群から選ばれた少なくとも一層に含まれる溶剤の濃度が５０ｐｐｍ以下であり、正極合剤層２１および負極合剤層３１から選ばれた少なくとも一層に含まれるバインダー４の濃度が、固体電解質層４０近傍よりも正極集電体６又は負極集電体７近傍の方が高い。【選択図】図１