Nanometer silicon carbide coated lithium nickel manganese cobalt cathode material and preparation method thereof

A technology of nickel-cobalt lithium manganate and nano-silicon carbide, which is applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. Rate capability and cycling capability, simple operation, and the effect of reducing surface polarization

Inactive Publication Date: 2017-02-15
JIANGSU XIANGYING NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no literature and patents have been found on the modification of lithium-ion battery ternary cathode materials with nano-silicon carbide

Method used

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  • Nanometer silicon carbide coated lithium nickel manganese cobalt cathode material and preparation method thereof
  • Nanometer silicon carbide coated lithium nickel manganese cobalt cathode material and preparation method thereof
  • Nanometer silicon carbide coated lithium nickel manganese cobalt cathode material and preparation method thereof

Examples

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Embodiment 1

[0032] This embodiment provides a kind of nano-silicon carbide coated nickel-cobalt lithium manganese oxide positive electrode material, and its preparation method comprises the following steps:

[0033] (a) Precursor (Ni 0.5 co 0.2 mn 0.3 )OH 2 Li:Ni 0.5 co 0.2 mn 0.3 =1.04:1 molar ratio using dry mixing method for uniform mixing; then packed into a sagger for compaction, sintered at a constant temperature of 910°C in an air atmosphere for 12h, naturally cooled to below 80°C after completion, coarsely broken, Finely crushing and sieving to obtain the nickel-cobalt-lithium-manganese-oxide positive electrode material;

[0034] (b) Put the above-mentioned nickel-cobalt lithium manganese oxide positive electrode material and nano-silicon carbide (primary particle size is 10-100nm) at a mass ratio of 1000:4, and put them into a ball mill tank lined with polytetrafluoroethylene (using oxidation Zirconium balls are mixed and coated by dry ball milling at a speed of 200 rpm fo...

Embodiment 2

[0036] This embodiment provides a nano-silicon carbide-coated nickel-cobalt-lithium-manganese-oxide positive electrode material. Its preparation method is basically the same as that in Example 1, except that different nano-silicon carbides are used, and the primary particle size is 100-400nm, the sample number is SY523C-2, such as image 3 shown.

Embodiment 3

[0038]This embodiment provides a nano-silicon carbide-coated nickel-cobalt lithium manganese oxide positive electrode material. Its preparation method is basically the same as that in Example 1, except that the nickel-cobalt lithium manganese oxide prepared by sintering is LiNi 0.6 co 0.2 mn 0.2 o 2 ; In step (b), sintering at 800°C for 8h in an air atmosphere to obtain LiNi coated with nano-silicon carbide 0.6 co 0.2 mn 0.2 o 2 Sample SY622C-3, such as Figure 4 shown.

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Abstract

The invention relates to a nanometer silicon carbide coated lithium nickel manganese cobalt cathode material and preparation method thereof. The nanometer silicon carbide coated lithium nickel manganese cobalt cathode material is prepared through the coating of the nanometer silicon carbide on the surface of a lithium nickel manganese cobalt cathode material; the mass ratio of the lithium nickel manganese cobalt cathode material to the nanometer silicon carbide is 1: 0.002-0.02; the chemical general formula of the lithium nickel manganese cobalt cathode material is LiaNixCoyMnzO2, wherein a is not less than 0.9 and not more than 1.2, and x+y+1=1; and the grain size of the nanometer silicon carbide is 10-500nm. The nanometer silicon carbide is coated on the surface of the lithium nickel manganese cobalt cathode material to prepare the nanometer silicon carbide coated lithium nickel manganese cobalt cathode material, so that the conductivity of the cathode material is increased, the surface polarization of the material in the charging / discharging process is effectively lowered, thereby improving the rate performance and the cycle performance of the material.

Description

technical field [0001] The invention belongs to the field of electrode materials for energy devices, and relates to a positive electrode material, in particular to a nano-silicon carbide-coated nickel-cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Nickel cobalt lithium manganese oxide ternary cathode material has been widely studied since it was first reported in 1999. The ternary cathode material combines lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide through the synergistic effect of Ni-Co-Mn. The advantages of the three materials: high capacity characteristics of lithium nickel oxide, high safety performance and low cost of lithium manganese oxide, good cycle performance of lithium cobalt oxide, has become one of the most promising cathode materials for lithium ion batteries in recent years . At present, the country is vigorously developing new energy vehicles. As a high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 臧启扩徐利军程世扬
Owner JIANGSU XIANGYING NEW ENERGY TECH CO LTD
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