Method for improving the characteristics of lithium-ion secondary batteries and lithium-ion secondary batteries

摘要

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery and a method for improving the characteristics of a lithium ion secondary battery, which can be flow-soldered and have high versatility. SOLUTION: A positive electrode, a negative electrode, a separator, an electrolyte, an exterior case 2 containing these, a positive electrode terminal 15 connected to the positive electrode and pulled out to the outside of the exterior case 2, and an exterior connected to the negative electrode. A negative electrode terminal 14 drawn out to the outside of the case 2 is provided, the negative electrode contains lithium titanate, and the positive electrode terminal 15 and the negative electrode terminal 14 are pulled out in parallel in the same direction and can be short-circuited. It is characterized by. [Selection diagram] Fig. 1