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Author(s): |
Shi-you Li, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China
Jie Fan, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China
Xiao-ling Cui, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China
Xiao-li Xu, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China
Li-ping Mao, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China
Fa-qiang Li, College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou , China |
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Abstract: |
LiBC2O4F2 (LiODFB) as electrolyte material for lithium ion battery was synthesized from self-made BF3, and was used to prepare following electrolytes, 0.7 mol L-1 LiODFB/ethylene carbonate (EC) +ethyl methyl carbonate (EMC) + dimethyl carbonate (DMC) and 0.7 mol L-1 LiODFB /propylene carbonate (PC) +EMC+DMC. Conductivities κ of these electrolytes were tested, and the change law of κ with temperature θ was fitted. These electrolytes were used to assemble LiFePO4/Li cells which cycling performances, high and low temperature performances and rate performances were tested. Contrast to the comparing cells with the electrolyte system of LiBC4O8 (LiBOB) or LiPF6, LiODFB cells showed most excellent rate performances. Moreover, LiODFB cells’ using life and low temperature performances were very similar to LiPF6 cells, and better than LiBOB cells, meanwhile, LiODFB cells’ high temperature performances were very similar to LiBOB cells, and better than LiPF6 cells. This paper not only proves that LiODFB is an very promising alternative salt for lithium ion chemistry, but also provides appropriate solvent to exert LiODFB’s electrochemical performance.
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