Abstract
Lithium difluoro(oxalato)borate (LiODFB) was investigated as a lithium salt for non-aqueous electrolytes for LiMn 2O 4 cathode in lithium-ion batteries. Linear sweep voltammetry (LSV) tests were used to examine the electrochemical stability and the compatibility between the electrolytes and LiMn 2O 4 cathode. Through inductively coupled plasma (ICP) analysis, we compared the amount of Mn 2+ dissolved from the spinel cathode in 1 mol L −1 LiPF 6/EC + PC + EMC (1:1:3 wt.%) and 1 mol L −1 LiODFB/EC + PC + EMC (1:1:3 wt.%). AC impedance measurements and scanning electron microscopy (SEM) analysis were used to analyze the formation of the surface film on the LiMn 2O 4 cathode. These results demonstrate that ODFB anion can capture the dissolution manganese ions and form a denser and more compact surface film on the cathode surface to prevent the continued Mn 2+ dissolution, especially at high temperature. It is found that LiODFB, instead of LiPF 6, can improve the capacity retention significantly after 100 cycles at 25 °C and 60 °C, respectively. LiODFB is a very promising lithium salt for LiMn 2O 4 cathode in lithium-ion batteries.
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