LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To suppress Li precipitation at an electrode terminal.SOLUTION: A lithium ion secondary battery includes a positive electrode mixture layer 12 and a negative electrode mixture layer 22 facing the positive electrode mixture layer 12. The positive electrode mixture layer 12 includes a flat part 12a and an inclined terminal 12b continued to the flat part 12a. The positive electrode capacitance density at the inclined terminal 12b is lower than the positive electrode capacitance density at the flat part 12a.SELECTED DRAWING: Figure 5