High Performance Li[Li0.2Ni0.13Co0.13Mn0.54](BO4)0.75x(BO3)0.25xO2-3.75x Cathode with Polyanion for Li-Ion Batteries

Lithium rich manganese-based layered material is a promising high-capacity cathode candidate for lithium ion batteries, but it usually exhibits poor cycling stability and low safety because of the issues of oxygen ions unstability under high voltage. A strategy to promote the electrode performance of lithium rich manganese-based layered material through incorporation of boracic polyanion has been developed. As-synthesized Li[Li_0.2Ni_0.13Co_0.13Mn_0.54](BO₄)_0.015(BO₃)_0.005O_1.925 showed superior reversible capacity of 300 mAh/g after 80 cycles, excellent cycling stability with a capacity retention of 89% within 300 cycles, higher thermal stability and enhanced redox couple potentials in comparison with pristine Li[Li_0.2Ni_0.13Co_0.13Mn_0.54]O₂ when used as an cathode material for lithium ion batteries, which can be attributed to the tuned electronic structure after the incorporation. This facile enhanced strategy is expected to be extended to other high capacity electrode systems.