Investigation Of Electrochemical Properties Of High-capacity Li[Ni_xMn_{（2-x）/3}Li_{（1-2x）/3}]O₂-LiMO₂Electrodes By Activating Li₂MnO₃and Used As Cathode Materials For Li-ion Ba

Recently, Li₂MnO₃-LiMO2（M=Mn, Ni, Co）solid solution becomesthe focus of the new cathode material because of its high capacity（>250mAh/g） and the structural stability. In this paper we studiedthe electrochemical performances of xLi[NiyMn_{（2-y）/3}Li_{（1-2y）/3}]O₂·（1-x）LiNi1/3Co1/3Mn1/3O2（0<y≤0.5and x=0.5and0.7） and doped Ni2+into Li₂MnO₃(Li[NiyMn_{（2-y）/3}Li₉（1-2y）/3)]O₂) to substitute the site of lithium and manganese, which reduced the formation of Li2O and activated Li₂MnO₃. Meanwhile we explored and optimized the conditionssuch as feeding methods, the precipitant concentration, reaction temperature to study the differences of components xLiNiyMn_{（2-y）/3}Li_{（1-2y）/3}]O₂·（1-x）LiNi_1/3Co_1/3Mn_1/3O₂（x=0.5,0.7; y=1/12,1/4）electrode materials for electrochemical performances. And we also explored themechanism of solid solution used as cathode materials for Li-ionbatteries.In addition, we investigated transition metal oxides used as a newhigh-capacity anode material for lithium-ion battery such as Co3O4andNiO. Furthermore, we explored the influence of reaction conditions onthe morphology and electrochemical properties and investigated theelectrochemical reaction mechanism which was different from theconventional insertion/extraction mode.（1） We synthesized the Co₃O₄nanomaterials by a hydrothermal methodand a subsequent heat treatment. When these nonomaterials were appliedto the LIBs as anode materials, the Co3O4nanorods demonstrated the bestperformance. It has a stable reversible capacity of954mAh·g^-1as theanode of a LIB, much higher than the other two kinds of Co3O4of rod-likenanoclusters and nanoplates, even after35cycles. All results showed thatthe morphology and microstructure took very important roles as the anode materials in LIBs. And we also explored the mechanism of the Co3O4nanomaterials used as anode materials for Li-ion batteries.（2） We fabricated nano-NiO powders with different morphologies andsizes on the nickel foam directly by an one-step hydrothermal synthesisand surfactants. Then we used the products, without binder and solvent,directly as as lithium ion battery anode material and studied theirelectrochemical performances.