NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A nonaqueous electrolyte secondary battery is prevented from decreasing the remaining capacity and returned capacity at the time of continuous charge at high voltages and high temperatures. The battery has positive and negative electrodes, and a nonaqueous electrolytic solution containing ethylene carbonate and fluoroethylene carbonate as a solvent. The positive electrode contains a positive-electrode active material with the fine particles of a rare earth element compound deposited on its surface in a dispersed state.

主权项

1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode; a negative electrode; and a nonaqueous electrolytic solution, wherein: the nonaqueous electrolytic solution contains fluoroethylene carbonate as a solvent; the positive electrode contains a positive-electrode active material with fine particles of an oxyhydroxide or hydroxide of at least one element selected from the group consisting of erbium, praseodymium, neodymium, ytterbium, terbium, dysprosium, holmium, thulium, lutetium, and samarium, deposited on the surface thereof in a dispersed state; and the fine particles of the oxyhydroxide or hydroxide have an average particle size of not more than 100 nm.