Research progress of functional electrolyte for high-voltage LiCoO2 battery
Lithium cobalt oxide(LiCoO2)has the advantages of high compaction density,high volume energy density,excellent conductivity and long service life,which makes it still occupy the main market of consumer electronic products.The theoretical specific capacity of LiCoO2 material is as high as 274 mAh/g,while its capacity at a voltage of 4.2 V is only 140 mAh/g.As the increasing demand for high energy density of lithium-ion batteries,elevating the operating voltage becomes the direct route to enhancing the energy density of LiCoO2 batteries.Correspondingly,great attention has been paid to develop high voltage electrolyte with the advantages of high efficient and economical for practical application.Herein,the recent progress of functional electrolyte for high voltage LiCoO2 batteries has been reviewed elaborately,which could be divided to high voltage organic solvent,high voltage additive and localized high concentration electrolyte.The effect of electrochemical stability window,the film forming ability and the solvation structure of electrolyte on the performance of high voltage LiCoO2 batteries are discussed systematically.Finally,the further development of high voltage electrolytes for LiCoO2 cathode is prospected accordingly.
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