LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery which can prevent the capacity from dropping even if it is discharged with a large current, and besides can prevent the cycle life from becoming short. SOLUTION: A positive electrode active material layer 2 having LiCoO2 as its principal component and a negative electrode active material layer 4 consisting of lithium-aluminum alloy are laminated through an electrolyte layer 5. The electrolyte layer 5 is composed of a main electrolyte layer 5a, where a nonaqueous electrolyte is contained in a separator, and an auxiliary electrolyte layer 5b which has a high polymer solid electrolyte arranged between the main electrolyte layer 5a and the negative electrode active material layer 4 for its principal component.