Composite silicate and carbon composite material, preparation method of composite material, and lithium ion battery containing composite material

A composite silicate and composite material technology, applied in the composite material and the preparation method thereof, in the field of lithium ion batteries containing the material, can solve the problems affecting the electrochemical performance of the silicate positive electrode material, the large particle size of the silicate positive electrode material, Problems such as poor rate performance, to achieve good cyclic stability, prevent dissolution and corrosion, and achieve the effect of modification
CN102969503AActive Publication Date: 2013-03-13CHERY AUTOMOBILE CO LTD
4 Cites 14 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHERY AUTOMOBILE CO LTD
Publication Date
2013-03-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a composite silicate and carbon composite material, a preparation method of the composite material, and a lithium ion battery containing the composite material. The general formula of the composite silicate prepared by using the method is Li2FexMn(1-x)SiO4, wherein x is greater than or equal to 0 and smaller than or equal to 1. The preparation method comprises the following steps: (1) mixing a lithium compound, a ferrum compound, a manganese compound, a silicon compound and a carbon source; and (2) carrying out firing under inert atmosphere, so as to obtain Li2FexMn(1-x)SiO4 and carbon composite material. The preparation method is simple in technology and the cost is low. By using the method, both the surfaces of the composite silicate and the interiors of gaps of the composite silicate can be coated with the carbon. A conductive network can be formed in the way that the carbon is coated on the surface and in the gaps of the composite silicate, so that the conductivity of the composite material of the composite silicate and the carbon is enhanced; in addition, the composite material of the composite silicate and the carbon can be prevented from being dissolved and corroded by electrolyte; and the volume change resulting from a jahnteller effect of Mn<3+> is relieved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite material of composite silicate and carbon, a preparation method thereof, and a lithium ion battery containing the material. Background technique

[0002] With the advancement of science and technology, the requirements for energy storage equipment in the fields of electronic products (mobile phones, digital products, notebook computers, etc.), electric vehicles, medical equipment, and aerospace are increasing. At present, polyanionic cathode materials have been developed. , mainly phosphate cathode materials (LiMPO 4 ) and silicate cathode material (Li 2 MSiO 4 ) (where M=Mn, Fe, Co, etc.). Compared with phosphate cathode materials, silicate cathode materials can theoretically allow two lithiums to be deintercalated, thus having a higher theoretical specific capacity. Moreover, silicon has the highest content among the elements on the ear...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More