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High-performance graphite composite negative electrode material and preparation method thereof

A negative electrode material and composite material technology, applied in the field of high-performance graphite composite negative electrode material and its preparation, can solve the problems of unimproved cycle performance rate performance, cycle performance rate performance deviation, poor binding force, etc., and achieve gram capacity and cycle performance. The effect of improving performance, improving rate capability, and improving conductivity

Active Publication Date: 2018-03-02
乌兰察布市大盛石墨新材料股份有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

Although the obtained composite material has been improved in terms of gram capacity, its cycle performance and rate performance have not been improved. The reason is that due to the material prepared by the liquid phase method, the bonding force between graphite and nano-germanium is poor, and the conductivity The rate difference causes its cycle performance and its rate performance to deviate

Method used

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  • High-performance graphite composite negative electrode material and preparation method thereof
  • High-performance graphite composite negative electrode material and preparation method thereof
  • High-performance graphite composite negative electrode material and preparation method thereof

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preparation example Construction

[0024] The present invention also provides a preparation method of graphite composite negative electrode material, which comprises the following steps:

[0025] S1, adding a binder, a dispersant, a conductive agent, and an inorganic lithium compound to N-methylpyrrolidone in sequence to obtain a mixture;

[0026] S2, under an inert atmosphere, germanium oxide is deposited onto graphite by chemical vapor deposition to obtain a germanium oxide-graphite composite material;

[0027] S3, adding a germanium oxide-graphite composite material to the mixture, dispersing and then filtering to obtain a preform; and

[0028] S4, performing heat treatment on the preform to obtain a graphite composite negative electrode material, wherein the binder decomposes during the heat treatment to form a pore structure on the surface of the graphite composite negative electrode material.

[0029] In step S1, the binder is composed of polyvinylidene fluoride, sodium carboxymethyl cellulose and vinyl ...

Embodiment 1

[0043]1) Weigh 8g of composite binder (among them: 5.6g of polyvinylidene fluoride, 2g of sodium carboxymethylcellulose and 0.4g of ethylene carbonate) and add it to 500g of N-methylpyrrolidone. Then add 3g of sodium dodecylbenzene sulfonate and 3g of carbon nanotube conductive agent, after uniform dispersion, then add 75g of lithium metaaluminate to obtain mixture A after uniform dispersion.

[0044] 2) Under the protection of argon gas, 100g of graphite powder with a particle size of 3 μm is placed in a quartz boat, and 5g of germanium dioxide with a particle size of 300nm is placed on the heating port, heated to 1300°C by chemical vapor deposition, and Keeping it warm for 2 hours, and then cooling down to room temperature naturally to obtain a germanium oxide-graphite composite material B.

[0045] 3) Weighing 100g of germanium oxide-graphite composite material B was added to 500g of mixture A, mixed evenly, and filtered to obtain a preform.

[0046] 4) Transfer the prefor...

Embodiment 2

[0048] 1) Weigh 5g of composite binder (including: 2.5g of polyvinylidene fluoride, 2.0g of sodium carboxymethylcellulose and 0.5g of ethylene carbonate) and add it to 500g of N-methylpyrrolidone. , followed by adding 1g of sodium dodecylbenzenesulfonate, 0.5g of graphene and 0.5g of carbon nanotubes, and then adding 50g of lithium zirconate and 30g of lithium metaaluminate. Mixture A is obtained.

[0049] 2) Under the protection of an inert gas, place 100g of graphite powder with a particle size of 1.0μm in a quartz boat, and at the same time place 1g of germanium dioxide with a particle size of 100nm on the heating port, heat it to 1200°C by chemical vapor deposition, and Keeping it warm for 3 hours, and then cooling down to room temperature naturally, to obtain the germanium oxide-graphite composite material B.

[0050] 3) Weigh 200g of germanium oxide-graphite composite material B and add it to 500g of mixture A, mix evenly, and filter to obtain a preform.

[0051] 4) Tr...

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Abstract

The invention relates to a graphite composite negative electrode material. The graphite composite negative electrode material has a core-shell structure, and comprises a core part and a shell part which coats the core part, wherein the core part is a germanium oxide-graphite composite material composite material, the shell part is an inorganic lithium compound, and the shell part of the graphite composite negative electrode material has a porous structure. The invention also provides a preparation method of the graphite composite negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a high-performance graphite composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, long life and no memory effect, and are widely used in various civilian electronic equipment and their electric vehicles, energy storage, mobile power and other fields. As the application range of lithium-ion batteries becomes more and more extensive, people have higher energy density and rate performance of lithium-ion batteries to meet the needs of batteries used in future electric vehicles with longer cruising range and fast charging and quick discharging capabilities. The negative electrode material is a key part of the lithium-ion battery, and its performance has a great impact on the capacity, rate and cycle performance of the lithium-ion battery. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/587H01M4/624H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张彬赵磊
Owner 乌兰察布市大盛石墨新材料股份有限公司
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