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Silicon oxide-graphene coated high-nickel lithium battery anode material and preparation method

A graphene-coated, positive-electrode material technology, applied in the field of lithium-ion materials, can solve problems such as structural collapse and volume deformation, and achieve the effects of overcoming the generation of CO2, suppressing high-temperature gas production, and improving electrical conductivity and lithium-ion migration ability

Inactive Publication Date: 2018-08-10
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of structure collapse and serious volume deformation in the process of lithium ion deintercalation in the existing high-nickel ternary cathode materials while maintaining capacity and rate performance, the present invention proposes a silicon oxide-graphene-coated high-nickel lithium The battery cathode material and preparation method improve the volume deformation and structural stability of the high-nickel ternary cathode lithium ion after desorption, the preparation process is simple, and it is easy to realize industrial continuous operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 2 parts by weight of lithium salt, nickel salt, cobalt salt and manganese salt according to the molar ratio of lithium, nickel, cobalt and manganese 1:0.8:0.12:0.08, lithium carbonate, nickel carbonate, cobalt carbonate and manganese carbonate, 0.25 One part particle size is 18nm sintering aid calcium hypochlorite, 17 parts organic solvent styrene;

[0034] (2) Lithium salt, nickel salt, cobalt salt, manganese salt and sintering aid are added to the organic solvent, and the precursor slurry is obtained after high-speed stirring; the precursor slurry is obtained after stirring at a stirring rate of 500 rpm;

[0035] (3) In the wire mesh fixed with nano-mesoporous silica microspheres, the particle size of mesoporous silica is 510nm, the pore diameter is 25nm, and the loading amount of nano-mesoporous silica is 45% by mass, so The screen is a polymer PVC screen, and the diameter of the screen is 32 μm. The support material carrier is soaked in the precursor slurr...

Embodiment 2

[0039] (1) Weigh 2 parts by weight of lithium salt, nickel salt, cobalt salt and manganese salt, 2 parts by weight of lithium nitrate, nickel nitrate, 1 part by weight of cobalt nitrate and manganese nitrate according to the molar ratio of lithium, nickel, cobalt and manganese, 1:0.8:0.12:0.08, 0.33 parts of potassium permanganate with particle diameter of 10nm, 22 parts of organic solvent triethanolamine;

[0040] (2) Lithium salt, nickel salt, cobalt salt, manganese salt and sintering aid are added to the organic solvent, and the precursor slurry is obtained after high-speed stirring; the precursor slurry is obtained after stirring at a stirring rate of 1200 rpm;

[0041] (3) In the wire mesh fixed with nano-mesoporous silica microspheres, the particle size of mesoporous silica is 550nm, the pore diameter is 50nm, and the loading amount of nano-mesoporous silica is 60% by mass, so The screen is an ABS screen, and the diameter of the screen is 50 μm. The support material carr...

Embodiment 3

[0045] (1) Weigh 2 parts by weight of lithium salt, nickel salt, cobalt salt, manganese salt, lithium carbonate, nickel chloride, cobalt chloride and chloride Manganese, 0.1 part of potassium hypochlorite with a particle size of 10-30nm, 15 parts of organic solvent perchlorethylene, trichlorethylene mixed solution;

[0046] (2) Lithium salt, nickel salt, cobalt salt, manganese salt and sintering aid are added to the organic solvent, and the precursor slurry is obtained after high-speed stirring; the precursor slurry is obtained after stirring at a stirring rate of 300-1200 rpm;

[0047] (3) In the wire mesh fixed with nano-mesoporous silica microspheres, the particle size of mesoporous silica is 550nm, the pore diameter is 13nm, and the loading amount of nano-mesoporous silica is 38% by mass, so The screen is an NDC screen, and the diameter of the screen is 13 μm. The support material carrier is soaked in the precursor slurry, and after standing for 50 minutes, after the surfa...

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Abstract

The invention provides a silicon oxide-graphene coated high-nickel lithium battery anode material and a preparation method. A lithium source, a nickel source, a cobalt source, a manganese source and an accessory solvent are prepared into a high-nickel ternary precursor sizing agent by mixing and ball-grinding; a silk screen fixed with nano-sized mesoporous silicon oxide microballoons is dipped into the sizing agent; later, a high-nickel ternary powder material supported by silica dioxide is obtained by pre-sintering, sintering, ultrasonic smashing and grinding; and then, the high-nickel ternary powder is arranged in an organic solvent and configured into turbid liquid; a graphene slice layer is stripped off by a physical means, the turbid liquid is added, and stirring is carried out; low-temperature heat treatment is performed after filtering and drying; and the silicon oxide-graphene coated high-nickel ternary anode material is obtained. According to the anode material and the preparation method in the invention, the problems that the structure of the high-nickel ternary anode material collapses and volume deforms seriously during the lithium ion deintercalation process under thecondition of maintaining capacity and rate performance; the process is simple, and continuous production is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium ion materials, in particular to a silicon oxide-graphene-coated high-nickel lithium battery positive electrode material and a preparation method. Background technique [0002] Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, stronger discharge capacity, and longer cycle life, but also have an energy storage efficiency of more than 90%. The above characteristics determine the use of lithium-ion batteries in electric vehicles, storage power, etc. Great prospects for development. As lithium batteries become the mainstream of power supplies for various electronic devices, the demand continues to increase, and the requirements for batteries are getting higher and higher. It is becoming more and more important to develop high-capacity, high-energy-density lithium batteries, and to develop new high-capacity Active materials with high safety performance are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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