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A kind of preparation method of fast charging graphite composite material

A composite material and graphite technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of insufficient lithium ion intercalation, affecting material rate performance and safety performance, conductivity deviation, etc., to reduce irreversible capacity , Improve fast charging performance and safety performance, and improve the effect of embedding channels

Active Publication Date: 2020-10-16
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method mainly improves the intercalation rate of lithium ions by doping or coating carbon materials with large interlayer spacing formed after carbonization of phenolic resin materials. Affect the rate performance and safety performance of its materials

Method used

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  • A kind of preparation method of fast charging graphite composite material
  • A kind of preparation method of fast charging graphite composite material
  • A kind of preparation method of fast charging graphite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for fast-filling graphite composite material, comprising the following steps:

[0025] (1) Add 100g of organic titanium epoxy resin into 500ml of toluene, mix and stir evenly to obtain a mixed solution with a weight concentration of 20%; add graphene to the mixed solution, stir evenly, and then transfer it to a high-pressure reactor for hydrothermal reaction , the heating temperature is 80°C and the pressure is 3Mpa and the reaction is 2h. After the reaction is completed, the filtrate is removed by filtration. At a temperature of 50°C and a vacuum of 50pa, the filter residue is dried for 48h, and then transferred to a tube furnace. Carbonization at 550°C for 7 hours in an argon inert gas environment, resulting in a porous composite hard carbon matrix;

[0026] (2) 1g of lithium carbonate is added into deionized water to configure a lithium carbonate aqueous solution with a weight concentration of 5%, and 10g of porous composite hard carbon matrix is...

Embodiment 2

[0029] A preparation method for fast-filling graphite composite material, comprising the following steps:

[0030] (1) Add 100g of organic titanium epoxy resin into 1000g of xylene, mix and stir evenly to obtain a mixed solution with a weight concentration of 10%; add 3g graphene to the mixed solution, stir evenly, transfer to the autoclave for hydrothermal Reaction, react at a heating temperature of 60°C and a pressure of 5Mpa for 1h. After the reaction is complete, filter and remove the filtrate. At a temperature of 30°C and a vacuum of 100pa, dry the filter residue for 72h, then transfer it to a tube furnace and In an inert gas argon environment, carbonize the filter residue at a high temperature of 500°C for 8 hours to form a porous composite hard carbon matrix;

[0031] (2) 3g of lithium carbonate is added into deionized water to configure a weight concentration of 8% inorganic lithium salt solution, and 20g of porous composite hard carbon matrix is ​​added to the inorgan...

Embodiment 3

[0034] A preparation method for fast-filling graphite composite material, comprising the following steps:

[0035] (1) Add 100g organic titanium epoxy resin into 2000g acetone, mix and stir evenly to obtain a mixed solution with a weight concentration of 5%; add 1g graphene to the mixed solution, stir evenly, and transfer it to a high-pressure reactor for hydrothermal reaction , react at a heating temperature of 90°C and a pressure of 3Mpa for 2h. After the reaction is complete, filter and remove the filtrate. At a temperature of 80°C and a vacuum of 10pa, dry the filter residue for 12h, then transfer it to a tube furnace and In an inert gas argon environment, carbonize the filter residue at a high temperature of 550°C for 7 hours to form a porous composite hard carbon matrix;

[0036] (2) 1g of lithium hydroxide is added into deionized water to configure an inorganic lithium salt solution with a weight concentration of 7%, and 10g of porous composite hard carbon matrix is ​​a...

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Abstract

The invention discloses a preparation method of a quick-filling graphite composite material. The mehtod comprises the steps of adding organic titanium epoxy resin into an organic solvent, and uniformly stirring to obtain a mixed solution; adding graphene into the mixed solution, carrying out hydrothermal reaction under the conditions of heating and pressurizing, filtering to remove filtrate, drying filter residue at low temperature, and carbonizing the filter residue in an inert gas environment to obtain a porous composite hard carbon matrix; preparing an inorganic lithium salt aqueous solution, adding a porous composite hard carbon matrix into the inorganic lithium salt aqueous solution, stirring for reaction, filtering a reaction solution, and drying filter residues to obtain a lithium salt / porous composite hard carbon composite material; and adding glucose solution, adding artificial graphite, stirring, ball milling, filtering, drying, carbonizing under the protection of inert gas,naturally cooling to room temperature, and pulverizing. The preparation method of the quick-filling graphite composite material has the beneficial effects that the composite material has a porous structure and high first efficiency, improves the intercalation and deintercalation of lithium ions in the charge and discharge processes of the composite material, and improves the quick charge performance and safety of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a method for preparing a fast-charging graphite composite material. Background technique [0002] With the huge market demand for fast-charging pure electric vehicles and the introduction of national subsidies for fast-charging electric vehicles, it is required that electric vehicles have long battery life and fast charging and discharging performance in order to receive more state subsidies. The fast-charging batteries on the market mainly include lithium titanate batteries and fast-charging graphite / ternary lithium-ion batteries. Although lithium titanate batteries have advantages in charge and discharge rates, their low gram capacity and high voltage platform seriously restrict Its rapid promotion on fast-charging electric vehicles. [0003] Fast-charging graphite has a gram capacity more than double that of lithium titanate, and has become the main nega...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 许晓落安静刘尚吴浩吴琪
Owner 石家庄尚太科技股份有限公司
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