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Cathode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in the field of preparation of conductive nanocrystal/reduced graphene oxide composite materials prepared by solvothermal method, can solve the problems of agglomeration, high internal resistance, large interface resistance, etc., and achieves low contact resistance, The effect of low internal resistance and high specific capacity

Active Publication Date: 2015-08-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of preparation method of reducing graphene oxide / tin dioxide-based conductive nanocrystal composite with simple process, mild conditions and uniform dispersion, which solves the problem of graphene / metal oxide composite obtained in the prior art. The problems of graphene sheet stacking, large interface resistance, metal oxide particle agglomeration, and high internal resistance improve the specific capacity of the battery, and enhance the cycle stability and rate performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 0.2g of tungsten-doped tin dioxide (0.01 at% tungsten doping amount), and disperse it in deionized water to obtain a nanocrystal dispersion with a mass concentration of 0.01g / ml. Grind the reduced graphene oxide into a powder, weigh 0.9 g of the reduced graphene oxide powder and add it to the nanocrystal dispersion liquid, and after the magnetic stirring disperses evenly, ultrasonically disperse it for 0.5 hours, transfer the dispersion liquid into a high-pressure reactor, and After reacting at 120° C. for 6 hours, cool to room temperature, take out the reactant, wash and dry to obtain a tungsten-doped tin oxide / reduced graphene oxide composite material. The above composite is used as a lithium ion battery negative electrode material, and the specific capacity after stabilization is 1011mAh / g.

Embodiment 2

[0030] Weigh 0.3g of molybdenum-doped tin dioxide (molybdenum doping amount 0.7 at%), and disperse in deionized water to obtain a nanocrystal dispersion with a mass concentration of 0.01g / ml. Grind the reduced graphene oxide into a powder, weigh 1.0 g of the reduced graphene oxide powder and add it to the nanocrystal dispersion liquid, and after magnetic stirring and dispersion, ultrasonically disperse for 6 hours, transfer the dispersion liquid to a high-pressure reactor, and After reacting at 120° C. for 72 hours, cool to room temperature, take out the reactant, wash and dry to obtain a molybdenum-doped tin oxide / reduced graphene oxide composite material. The above composite is used as anode material of lithium ion battery, and the specific capacity after stabilization is 1093mAh / g.

Embodiment 3

[0032] Weigh 0.6g of fluorine-doped tin dioxide (20at% fluorine doping amount), and disperse in deionized water to obtain a nanocrystal dispersion with a mass concentration of 0.03g / ml. Grind the reduced graphene oxide into a powder, weigh 2g of the reduced graphene oxide powder and add it to the nanocrystal dispersion liquid. After magnetic stirring and dispersion, ultrasonic dispersion is carried out for 6 hours, and the dispersion liquid is transferred to an autoclave. After reacting at ℃ for 6 hours, cool to room temperature, take out the reactant, wash and dry to obtain the fluorine-doped tin dioxide / reduced graphene oxide composite material. The above composite is used as anode material of lithium ion battery, and the specific capacity after stabilization is 1133mAh / g.

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Abstract

The invention discloses a cathode material for a lithium ion battery and a preparation method thereof. Stannic oxide-based conductive nanocrystal particles are uniformly loaded on the surfaces of reduced graphene oxide slice layers, and one to five layers of reduced graphene oxide slice are available. The stannic oxide-based conductive nanocrystal is SnO2 doped with one or a plurality of W, F, Mo, Nb, Ta and Cr. The doping content of heteroatom is 0.01-20at%. The mass ratio of the reduced graphene oxide to stannic oxide-based conductive nanocrystal is 1: (0.1-10). The size of the loaded nanocrystal is 7-30nm. Square resistance is 20-60 Omega. The conductive nanocrystal or reduced graphene oxide composite material prepared by the method overcomes the defects of large interface resistance, high internal resistance, stacking of the graphene slices, aggregation of loaded particles and so on of conventional composite materials. The stannic oxide-based conductive nanocrystal or reduced graphene oxide composite cathode material prepared by the method has excellent electrochemical performance, high specific capacity, good cycle performance and small internal resistance.

Description

technical field [0001] The invention belongs to the intersecting technical field of new energy material science and electrochemical technology, and relates to a method for preparing a conductive nanocrystal / reduced graphene oxide composite material by a solvothermal method. Background technique [0002] Due to the decreasing reserves of fossil fuels and the aggravation of environmental pollution, at the same time, people's demand for energy is increasing, and the development of clean and efficient new energy has become the research focus of people all over the world. As a new type of energy storage device, lithium-ion batteries have the advantages of high specific energy, high working voltage, long cycle life and environmental friendliness, and are widely used in hybrid vehicles, electric vehicles, smart grids and other fields. [0003] The electrode material is the key to affect the energy density and service life of the battery. At present, the negative electrode material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525
CPCB82Y30/00H01M4/366H01M4/48H01M4/587H01M10/0525H01M2004/021Y02E60/10
Inventor 施利毅袁帅毕越王帅徐海平
Owner SHANGHAI UNIV
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