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Preparation method of lithium titanate negative electrode material with nitrogen-doped and carbon-coated layer

A technology of nitrogen-doped carbon and negative electrode materials, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc. Solid density and other issues, to achieve the effect of low cost, improve rate cycle performance, and improve conductivity

Inactive Publication Date: 2017-12-08
MCNAIR TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anode materials prepared by the above-mentioned improved methods often exhibit low tap density and large irreversible capacity, and it is difficult to produce power batteries with high energy density.

Method used

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  • Preparation method of lithium titanate negative electrode material with nitrogen-doped and carbon-coated layer

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Effect test

Embodiment 1

[0025] A method for preparing a lithium titanate negative electrode material with a nitrogen-doped carbon coating layer, which includes the following steps:

[0026] Step 1). Add butyl titanate to the cetyltrimethylammonium bromide solution, stir well, and then slowly add the lithium acetate solution, stir evenly, to obtain a mixed solution, in which, butyl titanate, ten The molar ratio between hexaalkyltrimethylammonium bromide and lithium acetate is 1:0.2:0.8;

[0027] Step 2). Transfer the mixed solution of step 1) to a hydrothermal kettle, conduct a hydrothermal reaction treatment at 180°C for 24 to 48 hours, then dry it at 85°C, and place the dried powder Heat to 700℃ in a tube furnace with argon gas and keep it for 7 hours to obtain the precursor nano lithium carbonate material;

[0028] Step 3). Distribute the nano-lithium carbonate material obtained in step 2 uniformly in an alumina crucible, and place it in a tube furnace filled with argon and acetonitrile steam, the flow r...

Embodiment 2

[0030] A method for preparing a lithium titanate negative electrode material with a nitrogen-doped carbon coating layer, which includes the following steps:

[0031] Step 1). Add butyl titanate to the cetyltrimethylammonium bromide solution, stir well, and then slowly add the lithium hydroxide solution, stir evenly to obtain a mixed solution, wherein, butyl titanate, The molar ratio between cetyltrimethylammonium bromide and lithium hydroxide is 1:0.05:0.1;

[0032] Step 2). Transfer the mixed solution of step 1) to a hydrothermal kettle, conduct a hydrothermal reaction treatment at 160°C for 24 to 48 hours, then dry it at 75°C, and place the dried powder Heat it to 600℃ in a tube furnace with argon gas and keep it for 8 hours to obtain the precursor nano lithium carbonate material;

[0033] Step 3). Distribute the nano-lithium carbonate material obtained in step 2 uniformly in an alumina crucible and place it in a tube furnace filled with argon and acetonitrile steam, the flow rate...

Embodiment 3

[0035] A method for preparing a lithium titanate negative electrode material with a nitrogen-doped carbon coating layer, which includes the following steps:

[0036] Step 1). Add titanium dioxide to the cetyltrimethylammonium bromide solution, stir well, and then slowly add the lithium carbonate solution, stir evenly to obtain a mixed solution, where titanium dioxide, cetyltrimethyl The molar ratio between ammonium bromide and lithium carbonate is 1:0.5:0.9;

[0037] Step 2). Transfer the mixed solution of step 1) to a hydrothermal kettle, conduct a hydrothermal reaction treatment at 200°C for 24 to 48 hours, then dry it at 95°C, and place the dried powder Heat it to 800℃ in a tube furnace with argon gas and keep it for 6 hours to obtain the precursor nano lithium carbonate material;

[0038] Step 3). Distribute the nano-lithium carbonate material obtained in step 2 uniformly in an alumina crucible, and place it in a tube furnace filled with argon and acetonitrile steam, the flow ra...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a preparation method of a lithium titanate negative electrode material with a nitrogen-doped and carbon-coated layer. The preparation method comprises the steps of firstly, preparing a nanometer lithium titanate material with high crystallinity and electrochemical performance by taking lithium acetate as a lithium source, butyl titanate as a titanium source and cetyl trimethyl ammonium bromide as a surfactant; and finally, depositing the uniform and controllable nitrogen-doped and carbon-coated layer on a surface of the sheet-shaped lithium titanate material by employing acetonitrile steam as a carbon source and a nitrogen source and by a chemical vapor deposition method. Therefore, the electrical conductivity of the lithium titanate material is improved, meanwhile, the storage of sheet-shaped morphology of lithium titanate is facilitated, the rate cycle property of a lithium titanate battery is further improved, and the problem that the lithium titanate battery is easy to get bubbles is prevented; and moreover, the preparation method is low in cost and simple in process and is suitable for industrial production on a large scale.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a method for preparing a lithium titanate negative electrode material with a nitrogen-doped carbon coating layer. Background technique [0002] Due to the characteristics of high charge and discharge efficiency, high energy density, environmental protection and low cost, lithium-ion batteries are currently widely used in electronic products and power vehicles. At present, the most widely used negative electrode material in the commercial is undoubtedly graphite. However, due to its low charge and discharge voltage platform, graphite negative electrodes will produce defects such as lithium dendrites that pierce the separator and cause safety problems. Researchers are currently actively developing New anode material to replace graphite anode. [0003] Among them, spinel lithium titanate (Li 4 Ti 5 O 12 ) In the process of lithium ion insertion and extraction, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 武俊伟靳晓诚丁志玉赵玲张新河张涛李容
Owner MCNAIR TECH
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