Overcharge and overdischarge protection of ambient temperature secondary lithium cells
US5278000A · kind A · utility
44Cited by
11References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode additive is provided for protecting an ambient temperature secondary lithium cell from over-charging or over-discharging. The cathode additive is chosen to create an upper voltage plateau which is slightly higher than a characteristic charge cutoff voltage of the cathode of the cell. The cathode additive additionally creates a lower voltage plateau which is slightly lower than the characteristic discharge cutoff voltage of the cell. Preferably the cathode additive is a transition metal oxide or a sulfide may, for example, include a mixture of Li.sub.2 Mn.sub.2 O.sub.4 and Li.sub.0.1 MoO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.