Mixed salts of LiTFSI and LiBOB for stable LiFePO₄-based batteries at elevated temperatures
2014
Chen, Xilin | Xu, Wu | Engelhard, Mark H. | Zheng, Jianming | Zhang, Yaohui | Ding, Fei | Qian, Jiangfeng | Zhang, Ji-Guang
To achieve excellent long-term cycling stability of LiFePO₄-based batteries at elevated temperatures, mixed salts of LiTFSI and LiBOB are used to replace the LiPF₆ salt in non-aqueous electrolytes. It is found that adding LiBOB into LiTFSI-based electrolytes effectively prevents severe corrosion to the Al current collector that is often observed in LiTFSI-based electrolytes which have high thermal stability. The LiFePO₄ cells using LiTFSI–LiBOB-based electrolytes demonstrate superior high temperature (60 °C) stability and similar room temperature performance (i.e., cycling stability and rate capability) when compared to the cells using the LiPF₆-based electrolyte.
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