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Method for preparing three-dimensional porous carbon-doped lithium titanate coating on surface of copper foil

A three-dimensional porous lithium titanate technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of complex process, harsh preparation conditions, poor electronic conductivity of lithium titanate coating, etc., to achieve simplified The effect of preparation process, reduction of preparation cost and resistance reduction

Active Publication Date: 2020-07-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method of the above-mentioned lithium titanate coating has problems such as complex process, harsh preparation conditions, use of a large amount of organic solvent, and poor electronic conductivity of the obtained lithium titanate coating.

Method used

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  • Method for preparing three-dimensional porous carbon-doped lithium titanate coating on surface of copper foil
  • Method for preparing three-dimensional porous carbon-doped lithium titanate coating on surface of copper foil
  • Method for preparing three-dimensional porous carbon-doped lithium titanate coating on surface of copper foil

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Embodiment

[0025] A method for preparing a three-dimensional porous carbon-doped lithium titanate coating on the surface of copper foil, comprising the following steps:

[0026] Step 1. Disperse titanyl sulfate and lithium hydroxide in deionized water, stir and mix evenly to obtain mixed solution A;

[0027] Step 2. Disperse PVP (molecular weight: 5,000-20,000) or PEG (molecular weight: 3,000-20,000) polymer carbon source in absolute ethanol, stir and mix evenly to obtain mixed solution B;

[0028] Step 3. Add mixed solution B to mixed solution A, stir and mix evenly to obtain mixed solution C; in the obtained mixed solution C, the concentration of titanium source is 5g / L, the concentration of lithium hydroxide is 15g / L, and the polymer The concentration of carbon source is 2~10g / L;

[0029] Step 4. Put the prepared mixed solution C in a stainless steel tank, use copper foil as the anode and the stainless steel tank as the cathode, and use a liquid-phase plasma oxidation power supply to...

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Abstract

The invention discloses a method for preparing a three-dimensional porous carbon-doped lithium titanate coating on the surface of a copper foil, and belongs to the field of lithium ion battery negative electrode preparation. The method comprises the following steps: 1) dispersing a titanium source and lithium hydroxide in deionized water to obtain a mixed solution A; 2) dispersing a macromolecularcarbon source into absolute ethyl alcohol to obtain a mixed solution B; 3) mixing the mixed solution B and the mixed solution A to obtain a mixed solution C; 4) putting the mixed solution C into a stainless steel tank body; taking a copper foil as an anode and a stainless steel tank body as a cathode, supplying power by adopting a liquid-phase plasma oxidation power supply, and oxidizing for 3-8minutes under the conditions that the pulse voltage is 700V-900V and the frequency is 60Hz-1000Hz, thereby forming the three-dimensional porous carbon-doped lithium titanate composite coating on the surface of the copper foil. The carbon-doped lithium titanate coating obtained by the invention has a three-dimensional porous structure, is beneficial to infiltration of electrolyte of the lithium ionbattery, and can reduce the resistance of diffusion and mass transfer.

Description

technical field [0001] The invention belongs to the field of negative electrode preparation of lithium ion batteries, and in particular relates to a method for in-situ growth of a three-dimensional porous carbon-doped lithium titanate coating on the surface of copper foil. Background technique [0002] Lithium titanate material (Li 4 Ti 5 o 12 , referred to as LTO) is considered to be one of the most promising anode materials. There is basically no volume change during the cycle of Li+ charge and discharge, and the structure is very stable. It is called a "zero strain" material, which makes LTO exhibit excellent cycle performance and long-life energy storage. At the same time, the lithiation voltage platform of LTO is around 1.55V (Vs Li+ / Li), which can effectively inhibit the formation of lithium dendrites and avoid potential safety hazards caused by lithium dendrite growth and electrolyte decomposition. However, as an insulating material, lithium titanate has low condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/1391H01M4/1393H01M10/0525
CPCH01M4/364H01M4/485H01M4/583H01M4/1391H01M4/1393H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 唐辉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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