Lithium ion battery positive electrode material and preparation method thereof

Abstract

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. The positive electrode material comprises a porous carbon sphere and a lithium cobalt phosphate material, wherein the lithium cobalt phosphate material is arranged in the porous carbon sphere, the peak intensity of X-ray diffraction peak of the lithium cobalt phosphate material conforms to the following: I<200> / I<131> is less than 1.5 but more than 0.8, the average grain size of the porous carbon sphere is 0.8-10 micrometers, the pore volume of the porous carbon sphere is (0.01-0.1) cm<3> / g and the carbon content of the positive electrode material is 2-10%. The lithium cobalt phosphate material obtained by employing the preparation method is uniform in particle size and excellent in electrochemical characteristics such as discharge specific capacity and cycle capacity retention ratio.

Description

technical field

[0001] The invention provides a lithium cobalt phosphate and a preparation method thereof. Background technique

[0002] Lithium-ion batteries have the advantages of high voltage, high energy density, light weight, high reliability, low self-discharge, long cycle life, and no memory effect. Therefore, they are widely used in many fields such as portable electronic devices and electric vehicles. At present, the preferred positive electrode active material for commercial lithium battery positive electrode is LiCoO 2 (lithium cobalt oxide), low safety performance. LiCoPO with regular olivine type 4 (Lithium cobalt phosphate) has improved safety performance compared with lithium cobalt oxide. At the same time, the preparation method is simpler than lithium ferrous phosphate, and the product consistency is good, which is conducive to large-scale production. Contents of the invention

[0003] The object of the present invention is to provide a lithium cobalt p...

Images