Lithium ion battery positive electrode material LiMnO2@C and preparation method thereof

Abstract

The invention belongs to the field of lithium ion batteries, and particularly provides a lithium ion battery positive electrode material layered lithium manganate LiMnO2@C and a preparation method thereof, and is used for overcoming the problem that the lithium ion battery positive electrode material layered lithium manganate (LiMnO2) is difficult to prepare and has the defects that the electrochemical performance is relatively poor, the structure is extremely easy to change, and the discharge cannot be carried out at a high rate. A hexahedron or cubic-morphology MnCO3 is prepared through a softening chemical method hydrothermal reaction, and then low-temperature solid-phase reaction with a lithium source is carried out after the high-activity Mn2O3 with the same shape is prepared, so thatthe prepared layered lithium manganate particle is a hexahedron or cubic structure material; the material is high in crystallinity and excellent in electrochemical performance at a relatively low rate; and meanwhile, the LiMnO2@C composite positive electrode material capable of being discharged at a high rate can be obtained through carbon coating.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material layered lithium manganate LiMnO 2 method of preparation. Background technique [0002] With the deteriorating global environment and climate, energy conservation and emission reduction are imminent, and countries all over the world are paying more and more attention to the development and application of new energy and renewable clean energy. As a power source with excellent performance and environmental protection, lithium-ion batteries have the advantages of high energy density, fast charging, small self-discharge, long-term storage, excellent cycle performance, and no memory effect. They have been widely used in various portable electronic and electrical equipment and will become the ideal power source of choice for future ele...

AI Technical Summary

Problems solved by technology

LiMnO synthesized lithium ion battery cathode material of the present invention 2 Carbon-coated layered lithium manganese oxide LiMnO with high discharge specific capacity and excellent cycle stability 2 @C can meet the requirements of high energy density, high power density and large rate charge and discharge. Its preparation method overcomes the shortcomings of the simple solid-phase synthesis method, such as uneven particle size distribution and poor electrochemical performance, and the prepared product has high purity and chemical uniformity. Good stability, high crystal quality, fine and uniform distribution of product particles, excellent electrochemical performance and low manufacturing cost; no phase transition from layered structure to cubic spinel structure occurs during charge and discharge, and excellent cycle performance

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