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Doped stannic oxide and graphene composite material and preparing method thereof

A technology of graphene and tin oxide, which is applied in the field of one-step in-situ preparation of doped tin oxide graphene composite materials and its preparation, can solve the problems of poor rate performance, insufficient binding force, and poor conductivity of negative electrode materials, and achieve synthesis Low cost, low cost, long life effect

Inactive Publication Date: 2017-02-22
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of metal oxides, the rate performance of this negative electrode material is not good, and the simple compounding leads to insufficient binding force between metal oxides and carbon-based materials (graphene), which is prone to particle separation during charge and discharge. Agglomeration, fragmentation, shedding and other problems

Method used

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  • Doped stannic oxide and graphene composite material and preparing method thereof
  • Doped stannic oxide and graphene composite material and preparing method thereof
  • Doped stannic oxide and graphene composite material and preparing method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Weigh 0.1 g of graphene oxide, evenly disperse it in 40 mL of water, add 0.5 g of stannous oxalate, stir for 1 hour, mix 4.3 mg of tungsten powder and 90 μL of hydrogen peroxide (the precursor of tungsten needs to use hydrogen peroxide) Add it after mixing, ultrasonically disperse for 2 hours, transfer to a hydrothermal kettle, add 30 mL of water, and react at 170°C for 24 hours. After cooling, the product was taken out, washed with water and ethanol several times, and vacuum-dried at 140° C. for 12 hours to obtain a tungsten-doped tin oxide graphene composite. The specific capacity of the above composite negative electrode material is about 1100 mAh / g.

Embodiment 2

[0033] Example 2: Weigh 0.06g of graphene oxide, uniformly disperse in 40 mL of ethanol, add 0.4g of stannous oxalate and 0.19g of ammonium fluoride, stir for 0.5h, ultrasonically disperse for 1h, transfer to a hydrothermal kettle, add 30 mL of water, react at 100°C for 48h. After cooling, the product was taken out and washed several times with water and ethanol, and dried in vacuum at 120° C. for 18 hours to obtain a fluorine-doped tin oxide graphene composite. The specific capacity of the above-mentioned composite negative electrode material is about 1000 mAh / g.

Embodiment 3

[0034] Example 3: Weigh 0.12 g of graphene oxide, uniformly disperse in 40 mL of water, add 1 g of stannous oxalate, stir for 1.5 h, add 31.5 mg of antimony trichloride, ultrasonically disperse for 2 h, transfer to a hydrothermal kettle, add 30 mL of water, react at 160°C for 48h. After cooling, the product was taken out, washed with water and ethanol several times, and vacuum-dried at 150° C. for 10 h to obtain an antimony-doped tin oxide graphene composite. The specific capacity of the above composite negative electrode material is about 1100 mAh / g.

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Abstract

The invention discloses a doped stannic oxide and graphene composite material and a preparing method thereof. Graphene is used as a skeleton of the compound, and doped stannic oxide grows on graphene in a in-situ mode to form the composite material of a spongy three-dimensional structure, wherein the mass ratio of doped stannic oxide to graphene is (3-7):1, the particle size of doped stannic oxide is 3-20 nm, and doped elements include at least one of W, F and Sb, and the ratio of the atom total weight of the doped elements to the atomic weight of Sn is 1:(0.01-100). The preparing process is simpler than the previous compounding method, reaction conditions are controllable, the problems that the previous composite material is large in interface resistance and internal resistance, load particles aggregate, the structure is instable are solved by the prepared material, and the doped stannic oxide and graphene composite material has excellent electrochemical performance such as high specific capacity, good cycle performance and excellent rate capability.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a synthesis method thereof, in particular to a one-step in-situ preparation of a doped tin oxide graphene composite material and a preparation method thereof. Background technique [0002] With the decrease of fossil fuel reserves and the gradual increase of environmental pollution, 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 energy, high working voltage, long cycle life, and environmental friendliness, and are widely used in hybrid electric 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 of the commercialized lithium-ion battery is mostly graphite. Due to its low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/587H01M4/36H01M10/0525
CPCH01M4/362H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 施利毅袁帅王帅巴超群闵国全王竹仪赵尹
Owner SHANGHAI UNIV
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