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Preparation method and application of 0D/2D heterostructure composite cathode material

A technology of heterostructure and negative electrode material, which is applied in the fields of nanotechnology, negative electrode, structural parts, etc. for materials and surface science, can solve the complex preparation process of LTO composite material, low energy density, low tap density, etc. problems, to achieve the effect of being conducive to large-scale production and market promotion, and improving the low specific capacity and large specific capacity

Active Publication Date: 2020-02-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LTO composite material prepared by the above scheme has complicated preparation process, high cost, low tap density and low energy density.

Method used

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  • Preparation method and application of 0D/2D heterostructure composite cathode material
  • Preparation method and application of 0D/2D heterostructure composite cathode material
  • Preparation method and application of 0D/2D heterostructure composite cathode material

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Embodiment 1

[0044] A method for preparing a 0D / 2D heterostructure composite negative electrode material, comprising the steps of:

[0045] (1) Under normal temperature conditions, dissolve 0.189g of lithium hydroxide monohydrate in 25mL of absolute ethanol by magnetic stirring for 20min, then add 1.7mL of tetrabutyl titanate dropwise, continue stirring for 12h, and finally add 25mL of Ionized water, transferred to a polytetrafluoroethylene reactor, kept at 180°C for 36h, cooled to room temperature naturally after the reaction, washed the product three times with dehydrated ethanol, dried in vacuum at 80°C for 6h, and then placed the precursor in air at 700 ℃ heat treatment for 6h to obtain two-dimensional lithium titanate nanosheets;

[0046](2) Evenly disperse 95 mg of the above-mentioned two-dimensional lithium titanate nanosheets in the organic solvent NMP to form a solution A with a concentration of 1 mg / mL; purchased, then obtained by protonation treatment, impregnated with dilute n...

Embodiment 2

[0049] A method for preparing a 0D / 2D heterostructure composite negative electrode material, comprising the steps of:

[0050] (1) Under normal temperature conditions, dissolve 0.189g of lithium hydroxide monohydrate in 25mL of absolute ethanol by magnetic stirring for 20min, then add 1.7mL of tetrabutyl titanate dropwise, continue stirring for 12h, and finally add 25mL of Ionized water, transferred to a polytetrafluoroethylene reactor, kept at 180°C for 36h, cooled to room temperature naturally after the reaction, washed the product three times with dehydrated ethanol, dried in vacuum at 80°C for 6h, and then placed the precursor in air at 700 ℃ heat treatment for 6h to obtain two-dimensional lithium titanate nanosheets;

[0051] (2) Evenly disperse 90 mg of the above-mentioned two-dimensional lithium titanate nanosheets in the organic solvent NMP to form a solution A with a concentration of 1 mg / mL; Purchased, then obtained by protonation treatment, soaked in dilute hydroch...

Embodiment 3

[0056] A method for preparing a 0D / 2D heterostructure composite negative electrode material, comprising the steps of:

[0057] (1) Under normal temperature conditions, dissolve 0.189g of lithium hydroxide monohydrate in 25mL of absolute ethanol by magnetic stirring for 20min, then add 1.7mL of tetrabutyl titanate dropwise, continue stirring for 12h, and finally add 25mL of Ionized water, transferred to a polytetrafluoroethylene reactor, kept at 180°C for 36h, cooled to room temperature naturally after the reaction, washed the product three times with dehydrated ethanol, dried in vacuum at 80°C for 6h, and then placed the precursor in air at 700 ℃ heat treatment for 6h to obtain two-dimensional lithium titanate nanosheets;

[0058] (2) Evenly disperse 80 mg of the above-mentioned two-dimensional lithium titanate nanosheets in the organic solvent NMP to form a solution A with a concentration of 1 mg / mL; Purchased, then obtained by protonation treatment, soaked in dilute hydroch...

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Abstract

The invention discloses a preparation method and application of a 0D / 2D heterostructure composite cathode material. According to the preparation method, a two-dimensional lithium titanate nanosheet isprepared through a solvothermal method and thermal treatment, zero-dimensional metallic oxide nanocrystals are purchased from commercialized products and subjected to protonation treatment, two materials are dispersed in an organic solvent and then are uniformly mixed, and a 0D / 2D heterostructure is formed under electrostatic interaction. According to the heterostructure, the 0D metallic oxide nanocrystals have good electrolyte wettability as a polar material, prevent self-aggregation of the lithium titanate nanosheet, increase the tap density of the lithium titanate nanosheet and improve gasgeneration in the lithium titanate charging / discharging process. Besides, a heterojunction interface can stimulate an electric constraint effect of the lithium titanate nanosheet and enhance storageof lithium ions, and therefore the heterostructure material can show good electrochemical properties and safety characteristics. The preparation method meanwhile has the advantages of being simple inpreparation technology, good in technological repeatability, low in cost, environmentally friendly and the like.

Description

technical field [0001] The invention relates to the preparation of negative electrode materials, in particular to a preparation method and application of an 0D / 2D heterogeneous structure composite negative electrode material. Background technique [0002] At present, lithium-ion batteries have been widely used in portable electronic devices, power supplies, hybrid vehicles and other equipment. However, the performance of lithium-ion batteries is close to the limit that the current commercial graphite anode can achieve, so the research of new anode materials has attracted more and more attention of researchers. A large number of studies have shown that titanium-based compounds are applied to the negative electrode of lithium-ion batteries, showing efficient storage and transfer of energy, and high safety performance. Especially spinel lithium titanate Li 4 Ti 5 o 12 When (LTO) is used as the negative electrode of lithium-ion batteries, the charge / discharge voltage platfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G49/06C01G51/04H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00H01M4/02
CPCC01G23/005C01G51/04C01G49/06B82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/62H01M10/0525H01M2004/021H01M2004/027C01P2004/80C01P2004/20C01P2006/40C01P2004/64Y02E60/10
Inventor 许国保张家玉杨利文李伦刘雄
Owner XIANGTAN UNIV
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