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Carbon self-coated micron-sized tungsten oxide, negative electrode material, battery and preparation method

A carbon self-coating and tungsten oxide technology, which is applied in the preparation/purification of carbon, tungsten oxide/tungsten hydroxide, battery electrodes, etc., can solve the problems of low specific capacity and poor cycle stability of electrode materials, and achieve uniform particle size , Stable charge and discharge, solve the effect of low specific capacity

Active Publication Date: 2020-02-11
QINGDAO UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In the embodiment of the present application, a carbon self-coated micron-scale tungsten oxide, negative electrode material, battery and preparation method are provided to help solve the problems of low specific capacity or poor cycle stability of electrode materials for potassium ion batteries in the prior art

Method used

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  • Carbon self-coated micron-sized tungsten oxide, negative electrode material, battery and preparation method
  • Carbon self-coated micron-sized tungsten oxide, negative electrode material, battery and preparation method
  • Carbon self-coated micron-sized tungsten oxide, negative electrode material, battery and preparation method

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preparation example Construction

[0041] figure 1 A schematic flow chart of a carbon self-coated micron-scale tungsten oxide preparation method provided in the examples of this application, as shown in figure 1 As shown, the method mainly includes the following steps.

[0042] Step S100: Prepare carbon self-coated micron tungsten oxide precursor by self-polymerization reaction with stirring in a water bath.

[0043] In an optional embodiment, the preparation of carbon self-coated micron-sized tungsten oxide precursor by reaction includes:

[0044] Step S101: adding carbon source and tungsten source into the dispersant to disperse and mix to obtain a mixed solution.

[0045] In an optional embodiment, the carbon source is a mixture of two or more of dopamine hydrochloride, polyvinylpyrrolidone and urotropine; the tungsten source is sodium tungstate, lithium tungstate and tungsten One or a mixture of two or more in ammonium acid; the dispersant is one or a mixture of absolute ethanol and deionized water.

[...

Embodiment 1

[0067] At room temperature, add 0.4g of tungstic acid, 1g of polyvinylpyrrolidone and 0.1g of PDA to the mixed solution of 100mL of water and 150mL of ethanol to disperse and mix. After stirring for 5 years, take 80mL of the above solution in a 100mL beaker for self-polymerization with water bath stirring For the reaction, the reaction temperature is 50° C., and the holding time is 5 hours. After the reaction is completed, the product is subjected to centrifugal drying treatment, and then vacuum-dried at 60° C. for 12 hours. Then place the dried sample in a porcelain boat at 500°C, with a heating rate of 2°C min -1 , The holding time is 2h, and the sintering atmosphere is argon.

Embodiment 2

[0069] At room temperature, add 0.5g tungstic acid, 1g polyvinylpyrrolidone and 0.1g PDA to the mixed solution of 100mL water and 150mL ethanol to disperse and mix. For the polymerization reaction, the reaction temperature is 80° C., and the holding time is 5 hours. After the reaction is completed, the product is subjected to centrifugal drying treatment, and then vacuum-dried at 60° C. for 12 hours. Then place the dried sample in a porcelain boat at 500°C, with a heating rate of 2°C min -1 , The holding time is 2h, and the sintering atmosphere is argon.

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Abstract

The embodiment of the invention discloses carbon self-coated micron-sized tungsten oxide, a negative electrode material, a battery and a preparation method. The method comprises the following steps of: preparing a precursor of the carbon self-coated micron-sized tungsten oxide by adopting a water bath stirring method, and calcining the precursor of the carbon self-coated micron-sized tungsten oxide in an inert atmosphere to obtain the carbon self-coated micron-sized tungsten oxide. The carbon self-coated micron-sized tungsten oxide composite material synthesized by adopting the method providedby the embodiment of the invention is of a pomegranate-like structure, and tungsten oxide nanoparticles are uniformly distributed in a carbon matrix. The carbon matrix can improve the conductivity ofthe carbon self-coated micron-sized tungsten oxide composite material, a rapid and shortened transmission channel for potassium ions is provided, and higher rate capability is provided for a battery.Besides, due to the confinement effect of carbon, the volume expansion and the structural damage of tungsten oxide after potassium ion intercalation can be effectively reduced for the tungsten oxidenanoparticles uniformly coated by carbon, and better cycle performance is provided for the battery.

Description

technical field [0001] The present application relates to the technical field of potassium ion batteries, in particular to a carbon self-coated micron-sized tungsten oxide, negative electrode material, battery and preparation method. Background technique [0002] With the continuous development of human society and economy, the demand for fossil resources continues to increase, leading to the depletion of resources, the intensification of environmental pollution, and the increasing global greenhouse effect. The development of new technologies such as exploring and developing new energy and reducing carbon dioxide emissions has become the current trend of human beings. extremely urgent need. The chemical energy storage device is a very important part of the energy system, and metal-ion batteries, including lithium-ion batteries, sodium-ion batteries, aluminum-ion batteries, and potassium-ion batteries, have attracted much attention. [0003] Lithium-ion batteries (LIBs), as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/054C01B32/05C01G41/02
CPCH01M4/483H01M4/625H01M10/054C01B32/05C01G41/02C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 李洪森赵忠晨胡正强郭向欣
Owner QINGDAO UNIV
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