What is Lithium cobalt phosphate powder

    Lithium cobalt phosphate is a positive electrode material used in commercial lithium ion batteries.Cobalt lithium phosphate anode material has a theoretical capacitance of 167mAh· G-1 and good safety performance. Compared with lithium electrode potential of about 4.8V, it is expected to be a new generation of high-capacity and high-voltage anode material.Zinc phosphate salts such as sodium zinc phosphate, sodium zinc hydrogen phosphate and lithium zinc phosphate have been successfully synthesized by low heat solid reaction method.Lithium cobalt phosphate has some disadvantages when it is used as anode material for lithium ion batteries.Due to band gap wider, for example, the electrical conductivity of the poor, and, at a high working voltage (not less than 5 v), the electrolyte decomposition in the electrode/electrolyte interface loop performance is not stable, these can cause the specific capacity of rapid attenuation of lithium cobalt phosphate and electrochemical activity is reduced, affect the use of the positive electrode material performance and service life.Therefore, it has become an important research direction to modify cobalt-lithium phosphate materials to improve electrochemical kinetics characteristics and stability of electrode/electrolyte interface.At present, the modification methods of cobalt lithium phosphate mainly include surface modification and bulk doping.The main method of surface modification is cladding. The purpose of cladding is to improve the electronic conductivity or form an isolation layer, avoid the direct contact between the active material and electrolyte, and inhibit the dissolution or oxidation of the active material.Bulk doping USES partial substitution of cation to improve the intrinsic ionic conductivity.The combination of surface coating and bulk doping is the development trend of positive electrode materials such as cobalt lithium phosphate.