| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery in which cycle life performance becomes appropriate at a high temperature time, and swelling of the battery while left in a high-temperature condition is suppressed. <P>SOLUTION: This non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode in which lithium ion is stored and released, and a non-aqueous electrolyte. The non-aqueous electrolyte contains 0.01 wt% or more and 3 wt% or less of LiBOB (lithium-bis-oxalate-borate) or LiFOB (lithium di-fluorooxalate-borate) as lithium salt against the total weight of the non-aqueous electrolyte, and furthermore, contains 0.01 wt% or more and 5 wt% or less of specific chain ether compounds against the total weight of the non-aqueous electrolyte. As for the chain ether compounds, di-methoxyethane, di-ethoxyethane, and 2-(2-methoxyethoxy)-1,1,1-tri-fluoroethane are used. <P>COPYRIGHT: (C)2009,JPO&INPIT |
