Li3V2(PO4)3 as a cathode additive for the over-discharge protection of lithium ion batteries

Abstract

Li₃V₂(PO₄)₃ has been used as a cathode additive to make lithium ion batteries (LIBs) retain a good electrochemical performance under over-discharge conditions. Its lower discharge voltage plateau effectively prevents the corrosion of anode collector-copper foil during the over-discharge progress. When 7 wt% Li₃V₂(PO₄)₃ is added to LiCoO₂ through a “layer to layer” mode, the capacity retention ratio of the LIBs has raised from 49.55% to 95.91%.