Wide operating temperature range electrolytes for lithium-ion capacitors achieving high performance
US10121605B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2015 |
| Grant date | Nov 6, 2018 |
| Priority date | — |
| Expiry date | May 16, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides for two types of wide operating temperature range electrolyte formulations that contain methyl butyrate (MB) and additives have been investigated and compared in Lithium-ion capacitors (LICs), which were consisted of hard carbon (HC)/stabilized lithium metal powder (SLMP) anodes and activated carbon (AC) cathodes. The electrolyte L1 that was 1M LiPF6 in ethylene carbonate (EC)+ethyl methyl carbonate (EMC)+MB (20:20:60 v/v %)+0.1M lithium bis(oxalato)borate (LiBOB) and electrolyte L2 that was 1M LiPF6 in EC+EMC+MB (20:20:60 v/v %)+0.1M lithium difluoro(oxalato)borate (LiDFOB) enabled the LICs to discharge at the temperature as low as −40° C., which the conventional electrolyte LP30 that was 1 M LiPF6 in EC+dimethyl carbonate (DMC) (50:50 w/w %) could not achieve. At the low temperature of −40° C., L2 held more than 64% of the discharge capacity at 30° C., while the L1 only had the discharge capacity retention of 30%. In addition, L2 proved to achieve better cycling performance compared to L1. After 10,000 cycles, the capacity retention of L1 and L2 were about 86.6% and 84.7%, which demonstrated the stable cycling performance for electrolyte L1 and L2. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.