NONAQUEOUS ELECTROLYTE BATTERY AND BATTERY PACK

摘要

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode contains active material particles and a coating material. The active material particles are represented by any one of the following formulae (1) to (3):;LixM1yO2  (1);LizM22wO4  (2);LisM3tPO4  (3);and have an average particle diameter of 0.1 to 10 μm. The coating material comprises at least particles having an average particle diameter of 60 nm or less or layers having an average thickness of 60 nm or less. The particles or the layers contain at least one element selected from the group consisting of Mg, Ti, Zr, Ba, B and C.

主权项

1. A nonaqueous electrolyte battery comprising:
a positive electrode containing active material particles and a coating material which covers a surface of each of the active material particles, wherein the active material particles are represented by any one of the following formulas (1) to (3) and have an average particle diameter of 0.1 to 10 μm, the coating material comprises at least particles having an average particle diameter of 60 nm or less or layers having an average thickness of 60 nm or less, the particles or the layers containing at least one element selected from the group consisting of Mg, Ti, Zr, Ba, B and C; a negative electrode including a metal compound absorbing lithium ions at 0.4 V (vs. Li/Li+) or more; a separator interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte including a mixture solvent and a lithium salt to be dissolved in the mixture solvent, the mixture solvent containing a first nonaqueous solvent containing at least one of propylene carbonate and ethylene carbonate and a second nonaqueous solvent containing at least one of γ-butyrolactone and a nonaqueous solvent having a nitrile group and a molecular weight of 40 to 100, and a content of the second nonaqueous solvent in the mixture solvent being 10 to 70% by volume:
LixM1yO2  (1)LizM22wO4  (2)LisM3tPO4  (3) where M1, M2 and M3, which may be the same or different, respectively represent at least one element selected from the group consisting of Mn, Ni, Co and Fe, and x, y, z, w, s and t satisfy the following requirements: 0