The Preparation and Modification of LiNi0.5MN1.5O4 Cathode Materials with High Rate Capacity Performance
Spinel LiNi0.5Mn1.5O4(LNMO)has the advantages of high voltage plateau(4.7 V),high reversible capacity(～140 mAh·g-1),good thermal stability,low cost,environmental friendliness and high energy density,making it one of the most promising high-voltage cathode materials for future applications.Compared with the traditional cathode materials LiCoO2 and LiFePO4,respectively,LNMO can provide energy density 20％and 30％higher than them.However,different micro-and nanostructures and compositions exhibit vastly different electrochemical properties,and the cycling and thermal stability of LNMO-based lithium-ion batteries are poor at high temperatures and in aqueous environments due to the oxidation of organic carbonate solvents and decomposition of LiPF6.Therefore,it is necessary to systematically and comprehensively summarize the structural features,preparation methods,materials and electrolyte modification progress of LNMO cathodes.This paper firstly discusses the structure as well as the electron transport property of LNMO anode in detail.On this basis,new advances in recent years in improving the cycling stability and multiplicity performance of LNMO-based batteries,especially the multiplicity performance and cycling stability enhancement strategies at high temperature,are highlighted,including three aspects:material synthesis,material modification(elemental doping,surface coating and morphology control,etc.),and electrolyte design.Finally,the future research and development of LNMO cathodes are prospected.
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