LiDFBP LiDFBP (Lithium difluoro bis(oxalato) phosphate) was employed as a salt-type additive for high-voltage OLO cathodes. LiDFBP additive underwent the electrochemical decomposition at the OLO cathode and formed electrochemically stable and relatively low resistive SEI layer. The addition of LiDFBP significantly improved the rate capability due to low interfacial resistance of the surface film gererated by LiDFBP. LiDFBP may delay lithium extraction on LiMO2 (M=Ni, Co, Mn) layered and regulate activation of Li2MnO3 phases. The cycling performance at an elevated temperature (60oC) seems to be related this. It is expected that the P element of LiDFBP-derived SEI layer can accept oxygen radical from activation of Li2MnO3 and trap HF produced by the LiPF6 hydrolysis reactions.
Figure 17. Scheme of LiDFBP derived SEI layer and its function.
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