| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary electric source which fairly reduces the danger of the combustion/ignition of an electrolyte. SOLUTION: The nonaqueous electrolyte secondary electric source contains a positive electrode containing porous carbon, a negative electrode containing a carbon material which can occlude and eliminate lithium ions, and the lithium ions. The limiting oxygen index of the nonaqueous electrolyte is 19.5 vol% or more. Here, the nonaqueous electrolyte contains at least a type of compounds having phosphorous and/or nitrogen in a molecule, preferably contains a compound having a double coupling between phosphorus and nitrogen, and more particularly preferably, contains a phosphagen compound. COPYRIGHT: (C)2006,JPO&NCIPI
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