Surface and interface modification strategies of cathode materials for lithium-ion batteries
Increasing the operating voltage of the cathode materials or using high specific capacity electrode materials is the most effective way to improve the energy density of lithium-ion batteries(LIBs).The increase in energy density results in a significant extraction and embedded of active lithium from the lattice of the cathode materials,leading to a series of cathode/electrolyte interface problems such as oxygen evolution,transition metal dissolution,interface side reaction,cation cross-layer migration,surface structure reconstruction.These phenomena can cause failure of cathode materials and the deterioration of battery performance.In this paper,the structure and surface and interface failure modes of three conventional types of cathode materials are summarized,including layered LiMeO2(Me=Ni、Co、Mn、Al),spinel-type LiMe2O4(Me=Ni、Mn)and olivine-type LiMePO4(Me=Fe、Mn).The latest research progresses on surface and interface of cathode materials are reviewed,focusing on the mechanism of coating,surface doping,gradient structure,particle morphology control and electrolyte additives on surface and interface modification are discussed.Key common problems and resolution strategies of surface and interface of cathode materials in LIBs are summarized.
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维普
