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 good contact between the solid electrolyte and the negative electrode active material, with excellent discharge capacity, rate characteristics, cycle characteristics, and coulombic efficiency.SOLUTION: In an all-solid-state lithium-ion battery, a negative electrode mixture layer includes 31.0 to 85.0 mass% of a negative electrode active material and 15.0 to 69.0 mass% of a solid electrolyte, and the negative electrode active material includes non-aggregated graphite particles in which graphite crystal plane spacing d002 is 0.3354 to 0.3360 nm, the 50% diameter D50 in the volume-based cumulative particle size distribution is 10.0 to 30.0 μm, and the circularity is 0.84 to 0.94, 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、放電容量と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３１．０～８５．０質量％及び固体電解質を１５．０～６９．０質量％含み、前記負極活物質は黒鉛結晶面間隔ｄ００２が０．３３５４～０．３３６０ｎｍであり、体積基準累積粒径分布における５０％径Ｄ５０が１０．０～３０．０μｍであり、円形度が０．８４～０．９４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