Lithium ion secondary battery
US10263294B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2017 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Jun 14, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a lithium ion secondary battery which has a low internal resistance in a low-SOC region and a sufficiently large amount of gas generated during overcharge. The lithium ion secondary battery disclosed herein includes an electrode body having a positive electrode and a negative electrode, and a nonaqueous electrolytic solution. The lithium ion secondary battery further includes a pressure-type safety mechanism. The nonaqueous electrolytic solution includes a gas generating agent. The positive electrode has a positive electrode active material layer including a positive electrode active material. The positive electrode active material includes a lithium transition metal composite oxide represented by LiNiaCobMncO2 wherein a, b and c satisfy the following conditions: 0.35≤a≤0.45, 0.15≤b≤0.25, 0.35≤c≤0.45, and a+b+c=1, and a lithium transition metal composite oxide represented by LiNixCoyMnzO2 wherein x, y and z satisfy the following conditions: 0.35≤x≤0.45, 0.45≤y≤0.55, 0.05≤z≤0.15, and x+y+z=1, and the mass ratio of the oxides is 60:40 to 85:15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.