Effects of Salts in Methyl Difluoroacetate-based Electrolytes on their Thermal Stability in Lithium-ion Batteries
✍ Scribed by T. Tanaka; T. Doi; S. Okada; J.-i. Yamaki
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 237 KB
- Volume
- 9
- Category
- Article
- ISSN
- 1615-6846
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✦ Synopsis
Abstract
The effects of salts in methyl difluoroacetate (MFA)‐based electrolytes on their ionic conductivity and their thermal stability were investigated. When LiPF~6~ was used as a salt, an MFA‐based electrolyte showed a higher ionic conductivity than an ethylene carbonate (EC) and dimethyl carbonate (DMC)‐based electrolyte from –30 to 25 °C. In DSC curves, while an MFA‐based electrolyte containing LiPF~6~ gave only negligible exothermic heat up to 400 °C, a large exothermic peak due to the electrolyte decomposition was observed at about 270 °C for an EC + DMC‐based electrolyte. The thermal stability of lithium metal and de‐lithiated LiCoO~2~ coexisting with an electrolyte of 1 mol dm^–3^ LiPF~6~/MFA is also reported.