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A kind of cobalt-free cathode material slurry and its preparation method and application

A cathode material and slurry technology, applied in the field of cobalt-free cathode material slurry and its preparation, can solve the problems of complex preparation method and high cost of cathode material, and achieve the effects of reducing the generation of impurities, stable performance and high safety

Active Publication Date: 2021-07-30
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the disclosed positive electrode material is very complicated and the cost is high

Method used

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  • A kind of cobalt-free cathode material slurry and its preparation method and application
  • A kind of cobalt-free cathode material slurry and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a cobalt-free cathode material slurry, which is composed of 95 parts by weight of a cobalt-free cathode material (LiNi 0.7 mn 0.3 o 2 ), 1.5 parts of binder (polyvinylidene fluoride, purchased from Sinopharm Chemical Reagent Network), 3.5 parts of conductive agent (conductive carbon black, purchased from Pioneer Technology), 30 parts of solvent (NMP) and 2 parts of unsaturated bond-containing Composition of sulfone compounds (DVS).

[0042] The preparation method of the above-mentioned cobalt-free cathode material slurry comprises the following steps:

[0043] After mixing the cobalt-free positive electrode material, the binder, the conductive agent and the solvent, add a sulfone compound containing an unsaturated bond, and mix uniformly at 25° C. to obtain the cobalt-free positive electrode material slurry.

Embodiment 2-5

[0045] The difference between Examples 2-5 and Example 1 is that the parts by weight of DVS are 3 parts, 4 parts, 5 parts and 6 parts respectively, and the rest are the same as Example 1.

Embodiment 6

[0047] This embodiment provides a cobalt-free cathode material slurry, which is composed of 95 parts by weight of a cobalt-free cathode material (Li 1.1 Ni 0.8 mn 0.2 o 2 ), 1 part of binder (polyacrylic acid, purchased from Sinopharm Chemical Reagent Network), 3 parts of conductive agent (carbon nanotubes, purchased from Pioneer Technology), 25 parts of solvent (NMP) and 1 part of sulfone containing unsaturated bonds compound (DVS) composition.

[0048] The preparation method of the above-mentioned cobalt-free cathode material slurry comprises the following steps:

[0049] After mixing the cobalt-free positive electrode material, binder, conductive agent and solvent, add a sulfone compound containing an unsaturated bond, and mix uniformly at 45° C. to obtain the positive electrode material slurry.

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Abstract

The invention relates to a cobalt-free positive electrode material slurry and a preparation method and application thereof. The cobalt-free positive electrode material slurry includes a cobalt-free positive electrode material, a solvent, a sulfone compound containing an unsaturated bond and an auxiliary agent. The positive electrode sheet formed by the cobalt-free positive electrode material slurry of the present invention can better isolate air and moisture, protect the core component of the cobalt-free positive electrode material, and the further formed lithium ion battery has higher initial discharge capacity and capacity retention rate And the first Coulombic efficiency, higher security.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cobalt-free cathode material slurry, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, wide operating temperature, high voltage window, etc., and are widely used in high energy density battery products. While improving the energy density of batteries, how to reduce the production cost of batteries and improve the safety of batteries has become an urgent problem to be solved by various battery industries. [0003] For positive electrode materials, there are many elements of nickel (Ni) and manganese (Mn). Nickel and manganese elements are mixed and enriched on the surface of the material. Under the action of voltage and potential, they are easily oxidized with carbonate solvents in the electrolyte. The reduction reaction causes battery gas production and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/525H01M4/505H01M4/04H01M4/1391H01M10/0525H01M10/42
CPCH01M4/62H01M4/525H01M4/505H01M4/04H01M4/1391H01M10/0525H01M10/4235Y02E60/10H01M4/131H01M2004/028H01M4/0404H01M10/052
Inventor 常兴奇
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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