Mixed salts of LiTFSI and LiBOB for stable LiFePO4-based batteries at elevated temperatures

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/C3TA13043F· OSTI ID:1130641

Chen, Xilin; Xu, Wu; Engelhard, Mark H.; Zheng, Jianming; Zhang, Yaohui; Ding, Fei; Qian, Jiangfeng; Zhang, Ji-Guang

To achieve stable long-term cycling stability at elevated temperatures, mixed salts of LiTFSI and LiBOB are used to replace LiPF6 salt in non-aqueous electrolytes for LiFePO4-based batteries. It is found that adding LiBOB in LiTFSI-based electrolytes effectively prevents the severe corrosion to Al current collectors that often is observed in LiTFSI-based electrolytes, which have high thermal stability. The cells using LiTFSI-LiBOB-based electrolytes demonstrate superior high temperature (60 °C) stability and very similar room temperature performance (i.e., cycling stability and rate capability) when compared to cells using the LiPF6-based electrolyte.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1130641
• Report Number(s): PNNL-SA-97421; JMCAET; 47476
• Journal Information: Journal of Materials Chemistry. A, Vol. 2, Issue 7; ISSN 2050-7488
• Publisher: Royal Society of Chemistry
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
Environmental Molecular Sciences Laboratory