NEGATIVE ELECTRODE MATERIAL AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND THEIR MANUFACTURING METHODS

• Main Authors: OSAWA RYOSUKE, TSUJIKO AKIRA, INOUE KAORU
• Format: Patent
• Language: English; Japanese
• Published: 10.10.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To improve the cycle characteristic of such a nonaqueous electrolyte secondary battery that negative electrode active material particles contain lithium silicate phases.SOLUTION: A negative electrode material comprises a composite particle 10. The composite particle 10 includes a negative electrode active material particle 11 and a coating film 12. The negative electrode active material particle 11 contains a silicon oxide phase and a lithium silicate phase. The coating film 12 covers the surface of the negative electrode active material particle 11. The coating film 12 contains an anion exchange resin. In the anion exchange resin, a fluoride ion is adsorbed on an exchange group. The anion exchange resin is included at 33 mass% or less in the negative electrode material.SELECTED DRAWING: Figure 1 【課題】負極活物質粒子にリチウムシリケート相が含まれている非水電解質二次電池において、サイクル特性を改善すること。【解決手段】負極材料は複合粒子１０を含む。複合粒子１０は負極活物質粒子１１および被膜１２を含む。負極活物質粒子１１は酸化珪素相およびリチウムシリケート相を含む。被膜１２は負極活物質粒子１１の表面を被覆している。被膜１２は陰イオン交換樹脂を含む。陰イオン交換樹脂において交換基にフッ化物イオンが吸着している。陰イオン交換樹脂は負極材料に３３質量％以下含まれている。【選択図】図１