Method for preparation of sulfur-nitrogen codoped carbon coated nano flower-like lithium titanate composite negative electrode material

A technology of lithium titanate and negative electrode materials, which is applied in the field of preparation of sulfur-nitrogen co-doped carbon-coated nano flower-shaped lithium titanate composite negative electrode materials, can solve the problems of poor electronic conductivity and achieve the effect of rapid hydrolysis

Active Publication Date: 2018-02-23
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve Li 4 Ti 5 o 12 To solve the problem of poor electronic conductivity, the present invention proposes a method for preparing sulfur-nitrogen co-doped carbon-coated

Method used

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  • Method for preparation of sulfur-nitrogen codoped carbon coated nano flower-like lithium titanate composite negative electrode material
  • Method for preparation of sulfur-nitrogen codoped carbon coated nano flower-like lithium titanate composite negative electrode material
  • Method for preparation of sulfur-nitrogen codoped carbon coated nano flower-like lithium titanate composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fully disperse 0.3g of polyvinylpyrrolidone, 0.015mol of n-butyl titanate and 0.01275mol of lithium hydroxide monohydrate in a mixed solvent of 200mL of anhydrous methanol and anhydrous DMF (the volume ratio of anhydrous methanol and anhydrous DMF is 4 : 1), and then transferred to a 250mL lined PPL reactor, the reactor was placed in a constant temperature infrared oven, and reacted for 8 hours at 180°C; the reacted suspension was filtered with a sand core filter, and the filter cake was filtered with Fully wash with water and methanol, dry at 80°C to obtain a lithium titanate precursor, and then plasma treat the precursor at 600°C for 30 minutes to obtain nano flower-shaped lithium titanate.

Embodiment 2

[0031] Fully disperse 0.2g of thiourea, 0.4g of polyacrylamide and the nano-flower-shaped lithium titanate obtained in Example 1 in distilled water, evaporate the solvent to dryness at 100°C, and fully vacuum-dry at 100°C to obtain sulfur-nitrogen Co-doped carbon-coated lithium titanate precursor; then plasma-treated the sulfur-nitrogen co-doped carbon-coated lithium titanate precursor at 600°C for 10 minutes to obtain sulfur-nitrogen co-doped carbon-coated nanoflowers Lithium titanate composite negative electrode material, the specific morphology is as attached figure 2 shown.

[0032] Electrochemical performance test

[0033] Using the products prepared in Example 1 of this patent, Comparative Example 1, Comparative Example 2, Comparative Example 3 and the negative electrode material prepared in Example 2 as active components respectively, the negative electrode for lithium ion batteries was prepared by the slurry method, specifically The operation is: mix the active ingr...

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Abstract

The invention relates to the technical field of lithium-ion-battery manufacture, in particular to a method for preparation of a sulfur-nitrogen codoped carbon coated nano flower-like lithium titanatecomposite negative electrode material. According to the method, polyvinylpyrrolidone, tetrabutyl titanate and lithium hydroxide monohydrate are dispersed in an organic solvent, after hydrolysis and calcination, thiourea and polyacrylamide are added, then high-temperature plasma treatment is conducted, and the sulfur-nitrogen codoped carbon coated nano flower-like lithium titanate composite negative electrode material is obtained. The seep of preparation of the electrode material and the specific capacity under the high rate condition are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for preparing a sulfur-nitrogen co-doped carbon-coated nano flower-shaped lithium titanate composite negative electrode material. Background technique [0002] Spinel lithium titanate (Li 4 Ti 5 o 12 ) as a new type of lithium-ion battery anode material has obvious advantages: zero strain, excellent cycle performance; high redox potential (1.5VvsLi), does not react with common electrolytes, good safety; environmentally friendly, easy Preparation, low cost, etc. Although Li 4 Ti 5 o 12 It has many advantages, but it also has a prominent problem: low conductivity, resulting in poor high rate performance, which will be greatly limited if it is applied to power vehicles, large energy storage batteries and other fields. It can be seen that increasing Li 4 Ti 5 O rate performance is Li 4 Ti 5 o 12 One of the key issues in the application o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 任玉荣肖慧丁建宁
Owner CHANGZHOU UNIV
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