Effects of lithium difluoro(oxalate)borate on the performance of Li-rich composite cathode in Li-ion battery

摘要

Promising capacity retention (more than 92% of initial capacity after 100 cycles), was exhibited in cells (graphite/xLi _2MnO _3· yLiMO _2) with 2 wt.% LiDFOB as additive. The outstanding cell performance was associated with the formation of stable solid electrolyte interface (SEI) film on the surface of electrodes derived from LiDFOB. Compared to the effect of the LiBOB additive, the main reason responsible for the greatly improved durability in LiDFOB added cells might be attributed to the more stable SEI film with lower interfacial resistance on the surface of anode.