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A kind of carbon self-coated micron 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 good cycle performance , stable charging and discharging, and high rate performance

Active Publication Date: 2022-07-26
QINGDAO UNIV
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  • Abstract
  • Description
  • 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

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  • A kind of carbon self-coated micron tungsten oxide, negative electrode material, battery and preparation method
  • A kind of carbon self-coated micron tungsten oxide, negative electrode material, battery and preparation method
  • A kind of carbon self-coated micron tungsten oxide, negative electrode material, battery and preparation method

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preparation example Construction

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

[0042] Step S100 : a precursor of carbon self-coated micron-sized tungsten oxide is prepared by a self-polymerization reaction stirred in a water bath.

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

[0044] Step S101 : adding a carbon source and a tungsten source into a dispersant, dispersing and mixing, 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 more mixtures of ammonium acid; the dispersing agent is one or two mixtures of absolute ethanol ...

Embodiment 1

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

Embodiment 2

[0069] At room temperature, 0.5g of tungstic acid, 1g of polyvinylpyrrolidone and 0.1g of PDA were added to the mixed solution of 100mL of water and 150mL of ethanol to disperse and mix, and after stirring for 5 years, 80mL of the above solution was taken in a 100mL beaker to carry out self-water bath stirring. In the polymerization reaction, the reaction temperature is 80°C, and the holding time is 5h. After the reaction is completed, the product is subjected to centrifugal drying treatment, and then vacuum dried at 60°C for 12h. After that, the dried samples were placed in a porcelain boat at 500 °C, and the heating rate was 2 °C min. -1 , the holding time is 2h, and the sintering atmosphere is argon.

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Abstract

The embodiment of the present application discloses a carbon self-coated micron-sized tungsten oxide, a negative electrode material, a battery and a preparation method. The method includes using a water bath stirring method to prepare a carbon self-coated micron-sized tungsten oxide precursor; The precursor of self-coated micron-scale tungsten oxide is calcined in an inert atmosphere to obtain carbon self-coated micron-scale tungsten oxide. The carbon self-coated micron-scale tungsten oxide composite material synthesized by the method provided in the embodiments of the present application has a garnet-like structure, wherein the tungsten oxide nanoparticles are uniformly distributed in the carbon matrix. The carbon matrix can improve the conductivity of carbon self-coated micron-scale tungsten oxide composites, provide fast and shortened transport channels for potassium ions, and provide higher rate performance for batteries. In addition, the tungsten oxide nanoparticles uniformly coated with carbon can effectively reduce the volume expansion and structural damage of tungsten oxide after potassium ion intercalation due to the confinement of carbon, and provide better cycle performance 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, a negative electrode material, a battery and a preparation method. Background technique [0002] With the continuous development of human society and economy, the demand for fossil resources continues to increase, resulting in increasingly depleted resources, increasing environmental pollution, and 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 extremely urgent need. Chemical energy storage devices are an important part of the energy system, among which 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 power sources, have been...

Claims

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Application Information

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Patent Type & Authority Patents(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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