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Graphite composite negative electrode material, preparation method thereof and battery

A negative electrode material and composite material technology, which is applied in the field of graphite composite negative electrode materials and its preparation, can solve the problems of poor fast charging performance, poor cycle performance and safety performance, and low charge and discharge rate of lithium-ion batteries, so as to improve fast charging performance and The effect of safety performance, low cost and stable structure

Active Publication Date: 2019-09-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current graphite negative electrode materials have defects such as low charge and discharge rates, which lead to poor fast charging performance of lithium-ion batteries using graphite negative electrode materials, and the current graphite negative electrode materials also have problems such as poor cycle performance and poor safety performance, which limits its use. Applications in fields such as electric vehicles

Method used

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  • Graphite composite negative electrode material, preparation method thereof and battery
  • Graphite composite negative electrode material, preparation method thereof and battery
  • Graphite composite negative electrode material, preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: Preparation of graphite composite negative electrode material A

[0052] (1) Add 100g of organic titanium epoxy resin to 1000mL of toluene to configure a homogeneous solution with a mass concentration of 10wt%, that is, the first mixed solution;

[0053] (2) Add 3g of graphene to the first mixed solution, stir evenly, transfer to the autoclave, and react for 2h at a temperature of 100°C and a pressure of 2Mpa to form a reaction product;

[0054] (3) filter the reaction product formed in the previous step, freeze-dry at low temperature, and heat up to 500° C. for carbonization for 6 h under an argon atmosphere to obtain a titanium-doped porous composite hard carbon matrix A;

[0055] (4) 3g lithium carbonate is added to the deionized water of 37.5g, and configuration concentration is the lithium carbonate brine solution of 8wt%;

[0056] (5) Add 20 g of the titanium-doped porous composite hard carbon substrate A prepared in step (3) to the lithium carbonat...

Embodiment 2

[0058] Embodiment 2: Preparation of graphite composite negative electrode material B

[0059] (1) Add 100g of organic titanium epoxy resin to 2000mL of toluene, and configure it into a homogeneous solution with a mass concentration of 5wt%, that is, the first mixed solution;

[0060] (2) Add 1g of graphene to the first mixed solution, stir evenly, transfer to the autoclave, and react for 2h at a temperature of 100°C and a pressure of 2Mpa to form a reaction product;

[0061] (3) filter the reaction product formed in the previous step, freeze-dry at low temperature, and heat up to 500° C. for carbonization for 6 h under an argon atmosphere to obtain a titanium-doped porous composite hard carbon matrix B;

[0062] (4) 1g of lithium zirconate is added to 20g of deionized water, and the configuration concentration is an aqueous solution of lithium carbonate salt of 5wt%;

[0063] (5) Add 30 g of the titanium-doped porous hard carbon composite matrix B prepared in step (3) to the ...

Embodiment 3

[0065] Embodiment 3: Preparation of graphite composite negative electrode material C

[0066] (1) Add 100g organic titanium epoxy resin to 500g cyclohexanone, and configure it into a homogeneous solution with a concentration of 20wt%, that is, the first mixed solution;

[0067] (2) Add 5g graphene in the first mixed solution, after stirring evenly, transfer to the autoclave, and at a temperature of 100°C and a pressure of 2Mpa, react for 2h to form a reaction product;

[0068] (3) filter the reaction product formed in the previous step, freeze-dry at low temperature, and heat up to 500° C. for carbonization for 6 h under an argon atmosphere to obtain a titanium-doped porous composite hard carbon matrix C;

[0069] (4) Add 5g of lithium zirconate to 50g of deionized water, and configure a lithium zirconate salt solution with a concentration of 10wt%;

[0070] (5) Add 30 g of titanium-doped porous hard carbon composite matrix C prepared in step (3) to the aqueous solution of li...

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Abstract

The invention discloses a graphite composite negative electrode material, a preparation method thereof and a battery. Specifically, the invention provides a graphite composite negative electrode material which comprises a graphite inner core and a coating layer coating the outer side of the graphite inner core. The coating layer comprises a titanium and lithium doped porous hard carbon composite material. Therefore, through the coating layer comprising the titanium and lithium doped porous hard carbon composite material, the lithium ion extraction rate of a negative electrode prepared from the graphite composite negative electrode material in the charging and discharging process can be improved, the rate capability and the cycle performance of the negative electrode are good, and the quick charging performance, the safety performance and the like of a battery using the negative electrode are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a graphite composite negative electrode material, a preparation method thereof, and a battery. Background technique [0002] At present, lithium-ion batteries are widely used in cameras, mobile phones, notebook computers, electric vehicles and other equipment due to their advantages such as stable voltage, high capacity, high energy density, long cycle life, and environmental friendliness. The negative electrode material of lithium ion battery is the key factor determining its performance. Among them, graphite material is widely used as the negative electrode material of lithium ion battery because of its high conductivity, high crystallinity, and relatively low price. At present, with the rapid development of electric vehicles, lithium-ion batteries with high energy density and fast charging and discharging speed are increasingly favored by the market. The negative electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 赵晓锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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