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Method for dispersing and coating electrode material and application of method

An electrode material and coating technology, applied in the field of high-efficiency dispersion and coating materials, can solve the problems of poor cycle stability and rate performance, and achieve the effects of good uniformity, simple method, excellent cycle stability and rate performance

Active Publication Date: 2018-02-02
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to use charge interaction to realize efficient dispersion and uniform coating of nanomaterials, especially for high-capacity battery anode materials, to solve the problems of poor cycle stability and rate performance during charge and discharge, and to provide a production Process route with simple process and commercial mass production

Method used

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  • Method for dispersing and coating electrode material and application of method
  • Method for dispersing and coating electrode material and application of method
  • Method for dispersing and coating electrode material and application of method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The graphene oxide solution with a concentration of 6 g / L and silicon oxide with a particle size of 500 nm were mixed and ball-milled for 6 hours, the frequency of the ball mill was 50 Hz, and the mass ratio of graphene oxide to silicon oxide was 3:7. Prepare a protonated chitosan solution with a concentration of 20g / L, stir and dissolve at 400r / min, then slowly add the uniformly mixed graphene oxide / silicon oxide slurry into the protonated chitosan solution, let stand and centrifuge the precipitate After collection, it was dried in a vacuum oven at 80°C with a centrifuge speed of 1000r / min, and the obtained powder was sintered in an argon atmosphere at 700°C for 3 hours with a heating rate of 5°C / min.

[0033] Scanning electron microscope (JEOL-6700F) was used to test the morphology of the composite material, the particle dispersion inside the material was observed by transmission electron microscope, and the surface coating of the material was observed by high-resoluti...

Embodiment 2

[0042]A graphene oxide solution with a concentration of 8 g / L and silicon powder with a particle size of 100 nm were mixed and ball milled for 4 hours, the frequency of the ball mill was 40 Hz, and the mass ratio of graphene oxide to silicon was 4:6. The configuration concentration is the protonated chitosan solution of 25g / L, and 40ml acetic acid is added thereto, 400r / min stirs and dissolves, then the graphene oxide / silicon powder slurry that is mixed is slowly added in the chitosan solution, let stand After the precipitate was collected by centrifugation, it was dried in a vacuum oven at 80°C at a centrifuge speed of 2000r / min, and the obtained powder was sintered in an argon atmosphere at 800°C for 3 hours at a heating rate of 5°C / min.

[0043] The thickness of the cladding layer is 10nm, the silicon content is 56% according to the thermogravimetric test, and the specific surface area of ​​the composite material is 7.9m2 as measured by nitrogen adsorption and desorption met...

Embodiment 3

[0045] The graphene oxide solution with a concentration of 10 g / L and tin dioxide with a particle size of 30 nm were mixed and ball milled for 2 hours, the frequency of the ball mill was 40 Hz, and the mass ratio of graphene oxide to tin dioxide was 2:8. Prepare an ammonia solution with a concentration of 10g / L, then slowly add the uniformly mixed graphene oxide / tin dioxide slurry into the ammonia solution, let it stand, collect the sediment by centrifugation, and dry it in a vacuum oven at 80°C. 2500r / min, the obtained powder was sintered in an argon atmosphere at 700°C for 3 hours, and the heating rate was 10°C / min.

[0046] The thickness of the cladding layer is 5nm, the content of tin dioxide is 78% according to the thermogravimetric test, and the specific surface area of ​​the composite material is 13.5m2 as measured by nitrogen adsorption and desorption method. 2 / g. The battery test method is the same as in Example 1, the voltage range is 0.01-3V, and the test results ...

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Abstract

The invention provides a method for dispersing and coating an electrode material. The method comprises the steps of 1) performing grinding and dispersing on a graphene oxide solution and an electrodematerial in a ball mill to obtain uniformly dispersed paste; 2) preparing a coagulation agent water solution at certain concentration, and slowly adding the paste obtained in the step 1) thereto; 3) performing centrifuging to obtain a condensated composite material, and performing drying; and 4) performing sintering treatment on the dried material obtained in the step 3) in inert atmosphere. Whenthe composite material prepared by the method is used as a negative electrode material of a lithium ion battery, excellent cycle stability and rate capability are shown; and in the cyclic process, theelectrode material is stable in interface, without causing obvious pulverization and fracturing phenomena.

Description

technical field [0001] The invention relates to a method for efficiently dispersing and covering materials, in particular to large-scale dispersion and covering materials and application as high specific capacity lithium ion battery electrode materials. Background technique: [0002] With the increasing consumption of non-renewable resources and the aggravation of environmental pollution, the development and utilization of new energy, especially clean energy, is extremely important to the sustainable development of society. Batteries have the advantages of no environmental pollution, low cost, and long life. They have been widely used in portable electronic devices and electric vehicles, and gradually occupy a dominant position in the energy field. As a strategic emerging industry and the transformation and development of my country's automobile industry An important breakthrough, improving the energy density of batteries is the main direction of future research and developme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/483H01M4/5815H01M4/628H01M10/0525Y02E60/10
Inventor 郭玉国徐泉殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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