| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary cell that has an excellent initial charge/discharge characteristics, an excellent discharge capacity and practically sufficient charge/discharge cycle properties. <P>SOLUTION: The nonaqueous electrolyte solution of the lithium ion secondary cell contains as a nonaqueous solvent propylenecarbonate, ethylenecarbonate and diethylcarbonate, and further contains a first compound expressed by formula (I) and a second compound expressed by formula (II) wherein R<SP>1</SP>and R<SP>2</SP>in formula (I) are a hydrogen atom and a 1-6 C hydrocarbon, respectively; R<SP>3</SP>to R<SP>6</SP>in formula (II) are a hydrogen atom and a 1-4 C hydrocarbon, respectively; and n=0 or 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
