ALL-SOLID-STATE LITHIUM-ION BATTERY

• Main Author: SOTOWA CHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 18.02.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide an all-solid-state lithium-ion battery with excellent rate characteristics, cycle characteristics, and coulombic efficiency, with good contact between a solid electrolyte and a negative electrode active material.SOLUTION: In an all-solid-state lithium-ion battery, a negative electrode mixture layer includes 35.0 to 80.0 mass% of a negative electrode active material, 19.0 to 64.0 mass% of a solid electrolyte, and 0.1 to less than 5.0 mass% of a conductive auxiliary agent. The negative electrode active material includes graphite particles having a non-aggregated structure in which the graphite crystal plane spacing d002 is 0.3354 to 0.3370 nm and the 50% diameter D50 in the volume-based cumulative particle size distribution is less than 0.1 to 10.0 μm, and the solid electrolyte is at least one selected from an oxide-based solid electrolyte and a sulfide-based solid electrolyte, and the D50 is a particle of 0.10 to 3.00 μm.SELECTED DRAWING: None 【課題】固体電解質と負極活物質の間の接触が良好な、レート特性とサイクル特性とクーロン効率に優れた全固体リチウムイオン電池の提供。【解決手段】全固体リチウムイオン電池であって、負極合剤層は負極活物質を３５．０～８０．０質量％、固体電解質を１９．０～６４．０質量％、導電助剤を０．１～５．０質量％未満含み、前記負極活物質は黒鉛結晶面間隔ｄ００２が０．３３５４～０．３３７０ｎｍであり、体積基準累積粒径分布における５０％径Ｄ５０が０．１～１０．０μｍ未満である非凝集構造の黒鉛粒子を含み、前記固体電解質は酸化物系固体電解質及び硫化物系固体電解質から選ばれる少なくとも１種であり、Ｄ５０が０．１０～３．００μｍの粒子であることを特徴とする。【選択図】なし