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Method for preparing nanometer titania coated graphite cathode material

A nano-titanium dioxide and graphite negative electrode technology, which is applied in the field of catalyst additives and lithium-ion battery negative electrode materials, can solve the problems of carbon nanotube negative electrode lack of voltage platform, low initial charge and discharge efficiency, carbon nanotube potential hysteresis, etc., and achieve high mechanical properties , good processing performance, and the effect of improving quality

Inactive Publication Date: 2017-05-24
HUBEI UEE ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of carbon nanotubes directly as lithium-ion battery anode materials also has disadvantages: 1) the first irreversible capacity is large, and the first charge and discharge efficiency is relatively low; 2) the carbon nanotube anode lacks a stable voltage platform; 3) carbon nanotubes potential hysteresis
There is no technical disclosure or use related to the preparation of nano-titanium dioxide-coated graphite materials

Method used

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  • Method for preparing nanometer titania coated graphite cathode material
  • Method for preparing nanometer titania coated graphite cathode material
  • Method for preparing nanometer titania coated graphite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of nano titanium dioxide coated graphite negative electrode material, the steps are:

[0044] Step 1: Add 60g of graphite to a mixed solution of 120mL of glacial acetic acid, 50mL of water and 100mL of absolute ethanol at room temperature with stirring, and mix thoroughly to obtain a mixture of graphite, glacial acetic acid, distilled water and absolute ethanol;

[0045] In the second step, at room temperature and under stirring conditions, within 30 minutes, mix 400 mL of butyl titanate 100 mL, n-propyl titanate 100 mL, isopropyl titanate 100 mL, and tetraethyl titanate 100 mL, and 100 mL Add the mixture of absolute ethanol dropwise to the mixture of graphite, glacial acetic acid, distilled water and absolute ethanol obtained in the first step, let stand for 0.5 hours, and dry at 120°C for 4 hours to obtain off-white or gray titanate gel packs Graphite powder;

[0046] The third step is to place the titanate gel-coated graphite powder obtained in ...

Embodiment 2

[0049] A preparation method of nano titanium dioxide coated graphite negative electrode material, the steps are:

[0050] The first step, at room temperature, under agitation condition, the graphite of 85g is added in the mixed solution of 100mL glacial acetic acid and 40mL water and 200mL dehydrated alcohol, fully mix, obtain graphite and glacial acetic acid, twice distilled water and dehydrated alcohol mixture;

[0051] Step 2: Add 120 mL of butyl titanate, 120 mL of n-propyl titanate, and 120 mL of tetraethyl titanate to a mixture of 360 mL and 200 mL of anhydrous ethanol dropwise within 60 minutes. Put the graphite obtained in the first step into the mixture of glacial acetic acid, twice distilled water and absolute ethanol, let it stand for 1 hour, and dry it at 130°C for 6 hours to obtain off-white or gray titanate gel-coated graphite powder;

[0052] The third step is to place the titanate gel-coated graphite powder obtained in the second step in a temperature-programm...

Embodiment 3

[0055] A preparation method of nano titanium dioxide coated graphite negative electrode material, the steps are:

[0056] Step 1: Add 105g of graphite to a mixed solution of 80mL of glacial acetic acid, 30mL of water and 300mL of absolute ethanol at room temperature with stirring, and mix thoroughly to obtain a mixture of graphite, glacial acetic acid, pure water and absolute ethanol ;

[0057] Step 2: Add 160 mL of butyl titanate, 160 mL of n-propyl titanate, and 300 mL of absolute ethanol to the graphite obtained in the first step within 90 minutes under stirring. In a mixture of glacial acetic acid, pure water and absolute ethanol, let stand for 2 hours, and dry at 140°C for 8 hours to obtain gray or gray black titanate gel-coated graphite powder;

[0058] The third step is to place the titanate gel-coated graphite powder obtained in the second step in a temperature-programmed furnace, raise the temperature to 550°C at a rate of 2°C per minute, and keep the temperature con...

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Abstract

The invention discloses a method for preparing a nanometer titania coated graphite cathode material. The method comprises the steps that A, graphite is added into a mixed solution of glacial acetic acid, water and absolute ethyl alcohol at room temperature under the stirring condition, the materials are fully mixed, and a mixture is obtained; B, a titanate and absolute ethyl alcohol mixed solution is dropwise added into the mixture obtained in the step A within a certain time at room temperature under the stirring condition, standing is carried out for several hours, drying is carried out, and metatitanic acid gel coated powdered graphite is obtained; C, the metatitanic acid gel coated powdered graphite obtained in the step B is placed in a program temperature control furnace, the temperature is raised to 350 DEG C to 850 DEG C at a certain heating rate, the constant temperature is kept for several hours under the vacuum condition, the product is naturally cooled to room temperature, and the anatase and rutile type nanometer titania coated graphite material is obtained. The grain size of the nanometer titania coated graphite cathode material ranges from 1 micrometer to 35 micrometers, and high specific discharge capacity, good cycle performance and high high-rate charge and discharge performance are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode materials and catalyst additives, and more specifically relates to a preparation method of lithium ion battery modified graphite negative electrode materials. The nano-titanium dioxide-coated graphite material prepared by the invention can be used as negative electrode material of lithium ion battery, and can also be used as photocatalyst for water treatment, electrochemical catalyst, organic synthesis catalyst and additive for fine chemical products. Background technique [0002] At present, the negative electrode material used in lithium-ion batteries is usually graphite material. Relevant research on lithium-ion battery anode materials is also mainly focused on the modification of natural graphite, new carbon nanotubes, graphene, amorphous carbon, and numerous metal oxides. Among them, graphite is the earliest carbon negative electrode material used in lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/587H01M10/0525H01M2004/021Y02E60/10
Inventor 刘瑶黄光艳林定文张文博舒方君周环波丁先红
Owner HUBEI UEE ENERGY TECH CO LTD
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