Type of mixed additives and electrolyte for lithium-ion secondary batteries using such mixed additives
US7700242B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2006 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Mar 12, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention discloses a type of mixed additives for electrolyte of lithium-ion secondary batteries, having the following characteristics: in weight percentage: biphenyl series: 0.5% to 95.4%; cyclohexylbenzene series: 1.1% to 93.8%; vinylene carbonate: 0.4% to 93.2%; phenyl vinyl sulfone: 0.5% to 96.5%; ethenyl sulfonyl benzene: 0.5% to 95.8%. This invention also discloses an electrolyte for lithium-ion secondary batteries comprising organic solvents and lithium saline, wherein the special characteristic is that it comprises 2% to 20% weight percentage of said mixed additives. The distinctive advantage of the mixed additives for lithium-ion secondary batteries of this invention is to effectively enhance the overcharging, low-temperature, and cycle properties of lithium-ion batteries. A lithium-ion battery having the mixed additives of this invention remains explosion-free, ignition-free and reliably safe when the lithium-ion secondary battery is overcharging. A battery of this invention's exemplary embodiment, when discharging at temperatures of −10° C. and −20° C., has high capacity, high medium voltage and low terminal inner resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.