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Graphite composite material, preparation method and application thereof

A technology of composite materials and graphite, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unfavorable material rate performance and low temperature performance, improvement, poor conductivity, etc., to achieve improved cycle performance and high Li+ conduction performance, rate capability, and low-temperature performance enhancement

Inactive Publication Date: 2017-02-01
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

TiO obtained by this patent 2 The cladding layer is likely to be amorphous, TiO 2 Poor electrical conductivity, especially the amorphous structure, which is not conducive to the improvement of the rate performance and low temperature performance of the material

Method used

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  • Graphite composite material, preparation method and application thereof

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[0029] The application also provides a preparation method of graphite composite material, comprising:

[0030] Under a protective atmosphere, the cladding layer raw material containing soluble titanium source, lithium source, graphite and solvent are mixed, heated and then calcined to obtain graphite composite material.

[0031] In the process of preparing the graphite composite material, in order to make the reaction fully proceed, the process of preparing the graphite composite material can be carried out according to the following process:

[0032] Mixing the graphite material with a solution of coating layer raw materials containing a soluble titanium source, and stirring to obtain a graphite material coated with titanium oxide on the surface;

[0033] The graphite material obtained above is mixed with a solution containing a lithium source, dried and calcined in sequence after stirring to obtain a graphite composite material.

[0034] According to the present invention, ...

Embodiment 1

[0043] Weigh 10g of commercial negative electrode graphite material and place it in a solution containing 1g TiOSO 4 dilute H 2 SO 4 (concentration 0.015mol / L) in 200mL aqueous solution, using propeller stirring method to stir evenly, add 0.17g calcium oxide (CaO) at the same time, stir thoroughly for 3h; root remains; at this point, the surface is coated with TiO(OH) 2 Graphite anode material, converted to TiO 2 Calculate, the mass ratio of graphite surface coating is 5wt%;

[0044] Place the obtained transition product in 20mL of 0.31mol / L LiOH solution prepared in advance, and then place it in a ball mill for ball milling for 2h, remove the slurry and dry it, and then calcinate it at 700°C under an inert atmosphere of nitrogen 2h, the graphite anode material coated with lithium-rich LTO was obtained. During the preparation of graphite anode materials, the reactions mainly include: H 2 SO 4 +CaO=CaSO 4 +H 2 O, TiOSO 4 +2H 2 O=TiO(OH) 2 +H 2 SO 4 , 5TiO(OH) 2 +...

Embodiment 2

[0046] Take by weighing 10g of commercial negative electrode graphite material and be placed in the solution that has 3.4g Ti(OC 4 h 9 ) 4 Magnetically stir in 80mL ethanol solution for 0.5h to make the stirring fully uniform, then transfer the reactant to a solvothermal reaction kettle, and react at 150°C for 3h, so that the graphite surface is coated with a layer of amorphous TiO 2 ,TiO 2 The coating amount is 8%. Mix the obtained reactant with 20mL of 0.4mol / L LiOH ethanol solution, and carry out sufficient magnetic stirring. After drying at 150°C for 2h, under the inert atmosphere of N2 gas, carry out 650°C After 3h of heat treatment, the graphite anode material coated with LTO was obtained. During the preparation of graphite anode materials, the reactions mainly include: Ti(OC 4 h 9 ) 4 = TiO 2 +2C 4 h 9 OC 4 h 9 ;5TiO 2 +4LiOH=Li 4 Ti 5 o 12 +2H 2 O.

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Abstract

The invention provides a graphite composite material. The graphite composite material comprises graphite and a lithium titanate layer coated on the surface of the graphite. The invention also provides a preparation method of the graphite composite material. The preparation method comprises the steps of mixing a coating layer raw material containing a dissolvable titanium source, a lithium source, graphite and a solvent in presence of a protective atmosphere; then heating the mixture; and then roasting the heated mixture to obtain the graphite composite material. As a thin lithium titanate layer with high Li+ conductivity and good degree of crystallization is coated on the surface of the graphite material, the cyclic performance of the graphite material is greatly improved, and the rate capability and the low-temperature performance are also facilitated.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a graphite composite material, its preparation method and application. Background technique [0002] With the rapid development of emerging markets in the field of new energy vehicles and energy storage, the demand for lithium-ion batteries has increased dramatically. The performance requirements of lithium-ion batteries for new energy vehicles, in addition to high energy density and high safety, also need to have a long life to meet the needs of the car's service life. The field of energy storage, such as photovoltaic energy storage, energy storage power stations, mobile base stations, and household energy storage, has very high requirements on the service life of energy products, generally more than 8 years. The life of a lithium-ion battery mainly depends on the material, process, and use environment, among which the battery material plays a key role. Among the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62
CPCH01M4/366H01M4/587H01M4/625H01M2220/20Y02E60/10
Inventor 钟宽林炳辉王文华李影吉纯
Owner GREE ELECTRIC APPLIANCES INC
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