| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which can improve a cycle property by protecting a positive electrode active material from the action of a hydrofluoric acid. <P>SOLUTION: In this nonaqueous electrolyte secondary battery provided with a nonaqueous electrolyte comprising LiPF6 as electrolyte salt, the nonaqueous electrolyte contains lithium borate. By this constitution, the hydrofluoric acid generated by the decomposition of the LiPF6 reacts with the lithium borate to precipitate as a boric acid compound not giving an adverse affect to the positive electrode active material and to be removed. Thereby, the cycle property can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
