In-situ nitrogen-doped carbon coated lithium titanate composite electrode material and preparation method thereof

A technology of carbon-coated lithium titanate and composite electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity, and achieve the effects of promoting energy storage performance, improving conductivity, and promoting charge and discharge performance

Active Publication Date: 2017-02-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide an in-situ nitrogen-doped carbon-coated Li 4 Ti 5 o 12 composite material

Method used

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  • In-situ nitrogen-doped carbon coated lithium titanate composite electrode material and preparation method thereof
  • In-situ nitrogen-doped carbon coated lithium titanate composite electrode material and preparation method thereof
  • In-situ nitrogen-doped carbon coated lithium titanate composite electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] 1) Add 40ml (13.6g) of tetrabutyl titanate (TBT) into 40ml of absolute ethanol, stir well to completely dissolve in the ethanol solution, and prepare mixed solution A. Then take 0.756g lithium hydroxide (LiOH·H 2 O) Dissolve in 40ml of distilled water and stir continuously with a glass rod until the lithium hydroxide is completely dissolved to make solution B. Slowly add solution B to solution A drop by drop, and use a constant temperature magnetic stirrer to continuously stir during the dropwise addition to prevent flocculation due to the continuous increase of viscosity. After the dropwise addition was completed, stirring was continued on a magnetic stirrer for 1 h, and then the mixed solution was transferred to a 100 ml hydrothermal reaction kettle and heated at 180° C. for 24 h. After the reaction was completed, it was cooled to room temperature, filtered, and the filter cake was washed repeatedly with water and absolute ethanol to obtain a white solid, which was d...

Embodiment 2

[0041] 1) Add 40ml (13.6g) of tetrabutyl titanate (TBT) into 40ml of absolute ethanol, stir well to completely dissolve in the ethanol solution, and prepare mixed solution A. Then take 0.756g lithium hydroxide (LiOH·H 2 O) Dissolve in 40ml of distilled water and stir continuously with a glass rod until the lithium hydroxide is completely dissolved to make solution B. Slowly add solution B to solution A drop by drop, and use a constant temperature magnetic stirrer to continuously stir during the dropwise addition to prevent flocculation due to the continuous increase of viscosity. After the dropwise addition was completed, stirring was continued on a magnetic stirrer for 1 h, and then the mixed solution was transferred to a 100 ml hydrothermal reaction kettle and heated at 180° C. for 24 h. After the reaction was completed, it was cooled to room temperature, filtered, and the filter cake was washed repeatedly with water and absolute ethanol to obtain a white solid, which was d...

Embodiment 3

[0046] 1) Add 40ml (13.6g) of tetrabutyl titanate (TBT) into 40ml of absolute ethanol, stir well to completely dissolve in the ethanol solution, and prepare mixed solution A. Then take 0.756g lithium hydroxide (LiOH·H 2O) Dissolve in 40ml of distilled water and stir continuously with a glass rod until the lithium hydroxide is completely dissolved to make solution B. Slowly add solution B to solution A drop by drop, and use a constant temperature magnetic stirrer to continuously stir during the dropwise addition to prevent flocculation due to the continuous increase of viscosity. After the dropwise addition was completed, stirring was continued on a magnetic stirrer for 1 h, and then the mixed solution was transferred to a 100 ml hydrothermal reaction kettle and heated at 200° C. for 24 h. After the reaction was completed, it was cooled to room temperature, filtered, and the filter cake was washed repeatedly with water and absolute ethanol to obtain a white solid, which was dr...

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Abstract

The invention discloses an in-situ nitrogen-doped carbon coated lithium titanate composite material. The in-situ nitrogen-doped carbon coated lithium titanate composite material is a composite material composed of a lithium titanate inner core and a nitrogen-doped carbon substance covering the surface of the lithium titanate inner core. The invention further discloses a method for preparing a lithium battery negative electrode material. The process disclosed by the invention is simple and easy to operate, and reaction conditions are moderate; a carbon coated layer of the prepared composite material is uniform, and the thickness is controllable; and the material has excellent circulating stability and rate performance when being used for the lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium-ion secondary batteries, and relates to the preparation of lithium titanate (Li titanate) uniformly coated with polypyrrole by a low-temperature gas-phase polymerization method. 4 Ti 5 o 12 ) precursor, followed by in situ preparation of nitrogen-doped carbon-coated Li 4 Ti 5 o 12 Composite approach. Background technique [0002] In the context of the gradual depletion of global non-renewable energy resources, encouraging the development of new energy has become the energy strategic focus of many countries. With its excellent performance, lithium-ion battery is becoming the most potential power source in portable power supply, electric vehicle and hybrid electric vehicle. At present, the poor safety performance of electrode materials, especially carbon anode materials, restricts the development of lithium-ion batteries for electric vehicles. This is because c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/587H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 段军飞朱致英袁松张昶陈召勇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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