LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery, whose positive electrode has an upper limit charging potential of 4.2 V or more but less than 4.35 V, exhibiting excellent effects of reducing internal resistance and suppressing battery expansion.SOLUTION: A lithium secondary battery includes: a positive electrode containing a cathode active material capable of inserting and extracting lithium ions; a negative electrode containing an anode active material capable of inserting and extracting lithium ions; a separator; and a nonaqueous electrolyte. The upper limit charging potential of the positive electrode is 4.2 V or more but less than 4.35 V. The nonaqueous electrolyte contains trialkoxy vinyl silane.