Advanced electrolyte could improve thermal stability of li-ion batteries

A research team at the Huazhong University of Science and Technology in China is studying the use of an advanced electrolyte material (LiFNFSI) to enhance the thermal stability of lithium-ion batteries. The team has conducted several tests of the material, replacing the more conventional LiPF6 electrolyte with this advanced substance. Hongbo Han, a member of the Chinese research team, points to these keys findings, which highlight the thermal stability of batteries with the LiFNFSI electrolyte substance:
The electrolyte having 1.0 M LiFNFSI in a mixture of ethylene carbonate and ethyl methyl carbonate shows high conductivity comparable to LiClO4, good electrochemical stability, and does not corrode aluminum. At both room temperature (25 °Celsisus) and elevated temperature (60 °C), the graphite/LiCoO2 cells with LiFNFSI exhibit better cycling performances than those with LiPF6.

Particularly, at 60 °C, the capacity fading rate of the LiFNFSI-based cell without any additive is 37% after 100 cycles, while the cell with LiPF6 fails rapidly. These outstanding properties of LiFNFSI make it an attractive candidate to overcome the rapid capacity fading of lithium-ion batteries at elevated temperatures
Upon repeated testing, the LiFNFSI electrolyte material displayed an ability to improve the performance of batteries operating at high temperatures. In an automotive application, this high-temp resiliency could prove beneficial, allowing automakers to forego the expensive liquid cooling techniques currently used to control battery temps in some plug-in vehicles.

[Source: Green Car Congress]

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