Battery

摘要

According to one embodiment, there is provided a battery including a positive electrode, and a negative electrode. The positive electrode contains a lithium-cobalt composite oxide and a lithium-manganese composite oxide. The negative electrode contains a lithium titanium composite oxide. The battery satisfies the following formula (1). In addition, an open circuit voltage (OCV) of the positive electrode when the battery is discharged to 1.8 V at 0.2 C is 3.6 V (Li v.s. Li+) or more.
(Qp/Qn)>1.1  (1);Qp is a charge capacity (mAh/m2) of the positive electrode per unit area, and Qn is a charge capacity (mAh/m2) of the negative electrode per unit area.

主权项

1. A battery comprising:
a positive electrode comprising a lithium-cobalt composite oxide and a lithium-manganese composite oxide wherein the lithium-manganese composite oxide is present in an amount greater than 50% by weight based on the total weight of the lithium-cobalt composite oxide and the lithium-manganese composite oxide, a negative electrode comprising a lithium titanium composite oxide, and a nonaqueous electrolyte, wherein: the battery satisfies the following formula (1), and an open circuit voltage of the positive electrode being 3.6 V (Li v.s. Li+) or more when the battery is discharged to 1.8 V at 0.2 C:
(Qp/Qn)>1.1  (1)wherein Qp is a charge capacity (mAh/m2) of the positive electrode per unit area, Qn is a charge capacity (mAh/m2) of the negative electrode per unit area, and
a charge and discharge range of the positive electrode is from 3.0 to 4.25 V (Li v.s. Li+), and a charge and discharge range of the negative electrode is from 1.4 to 2.0 V (Li v.s. Li+).