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Lithium titanate negative electrode material having multistage carbon-clad network structure, and preparation method and application thereof

A network structure and negative electrode material technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of difficult and fast transmission of lithium ions and electrons, inability to fully utilize the material capacity, lack of conductive network structure, etc., to achieve high-rate charging Improvement of discharge and internal capacity, good electrical conductivity, and suppression of excessive growth

Inactive Publication Date: 2019-05-21
德州贝珥碳纳米材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents only cover carbon nanotubes or graphene on the surface of lithium titanate materials, and the inside of the material particles still lacks an effective conductive network structure. Under high-rate charge and discharge, it is difficult for lithium ions and electrons to be quickly transported into the particles. Inability to fully utilize material capacity

Method used

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  • Lithium titanate negative electrode material having multistage carbon-clad network structure, and preparation method and application thereof
  • Lithium titanate negative electrode material having multistage carbon-clad network structure, and preparation method and application thereof
  • Lithium titanate negative electrode material having multistage carbon-clad network structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Weigh 17 ml of tetrabutyl titanate, 30 ml of graphene oxide dispersion with a concentration of 5 mg / ml, add it to 250 ml of absolute ethanol, add 10 ml of glacial acetic acid, and place it in a closed container with magnetic stirring to obtain ethanol Dispersions.

[0064] Slowly add 250 ml of deionized water dropwise, and stir vigorously during the addition of water at a speed of 500-1000 rpm to form a gray-black suspoemulsion.

[0065] The emulsion was transferred to a reactor with a volume of 1 L, and hydrothermally reacted in an oven at 150 °C for 6 h.

[0066] Use a circulating water vacuum pump to vacuum filter, collect and filter the precipitate, wash with absolute ethanol three times, add an equal volume of absolute ethanol to the reaction solution each time, and dry in vacuum at 60 °C for 12 h to form a nanoscale in-situ doped novel The titanium dioxide precursor of the conductive carbon material, wherein the doping ratio of carbon element is 4wt%.

[0067] T...

Embodiment 2

[0073]Weigh 17 ml of tetrabutyl titanate and 50 ml of carbon nanotube dispersion, add them to 250 ml of absolute ethanol, add 10 ml of glacial acetic acid, and place them in a closed container with magnetic stirring to obtain a dispersion.

[0074] Slowly add 250 ml of deionized water dropwise, and stir vigorously during the addition of water at a speed of 500-1000 rpm to form a gray-black suspoemulsion.

[0075] The emulsion was transferred to a reaction kettle with a volume of 1 L, and hydrothermally reacted in an oven at 180 °C for 2 h.

[0076] Use a circulating water vacuum pump to vacuum filter, collect and filter the precipitate, wash with absolute ethanol three times, add an equal volume of absolute ethanol to the reaction solution each time, and dry in vacuum at 60 °C for 12 h to form a nanoscale in-situ doped novel Titanium dioxide precursor of conductive carbon material, wherein the doping ratio of carbon element is 3.4wt%.

[0077] The precursor was pulverized and...

Embodiment 3

[0082] Weigh 20 ml of tetrabutyl titanate and 0.17 g of Ketjen black, add it to 300 ml of absolute ethanol, add 10 ml of nitric acid (concentration 68 wt%), place in a closed container and magnetically stir evenly to obtain a dispersion.

[0083] Slowly add 300 ml of deionized water dropwise, and stir vigorously during the addition of water at a speed of 500-1000 rpm to form a gray-black suspoemulsion.

[0084] The emulsion was transferred to a reactor with a volume of 1 L, and hydrothermally reacted in an oven at 150 °C for 6 h.

[0085] Use a circulating water vacuum pump to vacuum filter, collect and filter the precipitate, wash with absolute ethanol three times, add an equal volume of absolute ethanol to the reaction solution each time, and dry in vacuum at 60 °C for 12 h to form a nanoscale in-situ doped novel A titanium dioxide precursor of a conductive carbon material, wherein the doping ratio of carbon element is 3.0wt%.

[0086] The precursor was crushed through a 20...

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Abstract

The invention relates to a lithium titanate negative electrode material having a multistage carbon-clad network structure, and a preparation method and an application thereof. A novel conductive carbon material is doped in a TiO2 preparation process to achieve in-situ internal carbon doping in a lithium titanate raw material precursor, and the lithium titanate negative electrode material having the novel conductive carbon material doped therein and the multistage carbon-clad network structure clad by conventional carbon via external secondary carbon cladding synthesis. The lithium titanate negative electrode material having the multistage carbon-clad network structure provided by the invention can realize rapid charging and discharging at a large rate and fully exert the capacity of activesubstances in material particles, and is suitable for a lithium ion secondary battery electrode material.

Description

technical field [0001] The invention relates to a lithium titanate negative electrode material with a multi-level carbon-coated network structure and a preparation method thereof, which can be applied to lithium ion secondary batteries and belongs to the technical field of synthesis of lithium titanate negative electrode materials. Background technique [0002] Li 4 Ti 5 o 12 As a lithium-ion battery negative electrode material, the intercalation and extraction of lithium ions have little effect on the material structure during charging and discharging. It is called a zero-strain material and can be used normally in the range of minus 50°C to 75°C. Therefore, it is widely used in One of the preferred materials for power batteries. However, since the lithium titanate material is a semiconductor material, the conductivity of lithium ions and electrons is poor, resulting in serious polarization during high-rate charge and discharge of the lithium-ion battery made, and the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 张军峰侯士峰徐继正台利芝刘梦瑶
Owner 德州贝珥碳纳米材料研究院有限公司
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