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Method for preparing carbon cathode material and lithium iron battery using the material

A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as unfavorable to clean production, pollute the production environment, and increase the cost of preparation, so as to improve the first Coulombic efficiency and cycle stability Good compatibility, avoiding the peeling effect of graphite structure

Inactive Publication Date: 2014-05-28
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with graphite as the negative electrode is that during the first charge of graphite, solvent molecules and lithium ions are intercalated into the graphite layer, causing the decomposition of solvent and electrolyte.
The patent of BTR company whose application number is 200410027615.X discloses that the solvents used are benzene, toluene, xylene, ethylbenzene, petroleum ether, quinoline, thiophene or carbon disulfide, etc., and the patent of BYD company whose application number is 02126631.2 also discloses the use of solvents Acetone, chloroform, tetrahydrofuran, carbon tetrachloride, cyclohexane, and N-methylpyrrolidone, etc., the use of organic solvents not only increases the cost of material preparation, but also according to the principle of similar compatibility, organic solvents that dissolve asphalt are mostly large molecular weight Toxic organic solvents pollute the production environment and do great harm to the human body
Not conducive to clean production
This patent is to solve the problem of organic solvent pollution and cost

Method used

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  • Method for preparing carbon cathode material and lithium iron battery using the material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Take 6 grams of petroleum asphalt with a softening point of 55°C and heat it to 85°C to make it have good fluidity.

[0021] (2) Dissolve 0.36g of cetyltrimethylammonium chloride aqueous solution in 40ml of water according to 6% of the pitch weight, and adjust the pH to 4-5, and keep the temperature at 85°C to prepare the surfactant aqueous solution. (3) Take 4ml of surfactant aqueous solution, add 85°C asphalt to it, stir vigorously at high speed, keep the temperature at 85°C after mixing, and prepare emulsified asphalt. (4) Add 40 grams of spherical natural graphite (referred to as spheroidized graphite) to the remaining 36ml of surfactant solution, and stir it into a paste, wherein the specific surface area of ​​spheroidized graphite is 6.2m 2 / g, particle size 5-50μm and d002 0.3363nm; (5) Add emulsified pitch to graphite paste and stir at high speed for 1h to evaporate the water. (6) Heat-treat the emulsified pitch-coated graphite in an inert atmosphere of arg...

Embodiment 2

[0023] (1) Take 6 grams of petroleum asphalt with a softening point of 55°C and heat it to 85°C to make it have good fluidity.

[0024] (2) Dissolve 0.36 g of cetyltrimethylammonium chloride aqueous solution in 40 ml of water according to 6% of the pitch weight, add 0.06 g of nonylphenol polyoxyethylene ether, and adjust the pH=4 to 5, and make it The temperature was kept at 85°C to prepare an aqueous surfactant solution. (3) Take 4ml of surfactant aqueous solution, add 85°C asphalt to it, stir vigorously at high speed, keep the temperature at 85°C after mixing, and prepare emulsified asphalt. (4) Add 40 grams of spherical natural graphite (referred to as spheroidized graphite) to the remaining 36ml of surfactant solution, and stir it into a paste, wherein the specific surface area of ​​spheroidized graphite is 6.2m 2 / g, particle size 5-50μm and d002 0.3363nm; (5) Add emulsified pitch to graphite paste and stir at high speed for 1h to evaporate the water. (6) Heat-treat the...

Embodiment 3

[0026] (1) Take 6 grams of petroleum asphalt with a softening point of 55°C and heat it to 85°C to make it have good fluidity.

[0027] (2) Dissolve 0.48 g of cetyltrimethylammonium chloride aqueous solution in 40 ml of water according to 8% of the pitch weight, add 0.08 g of nonylphenol polyoxyethylene ether, and adjust the pH=4 to 5, and make it The temperature was kept at 85°C to prepare an aqueous surfactant solution. (3) Take 4ml of surfactant aqueous solution, add 85°C asphalt to it, stir vigorously at high speed, keep the temperature at 85°C after mixing, and prepare emulsified asphalt. (4) Add 40 grams of spherical natural graphite (referred to as spheroidized graphite) to the remaining 36ml of surfactant solution, and stir it into a paste, wherein the specific surface area of ​​spheroidized graphite is 6.2m 2 / g, particle size 5-50μm and d002 0.3363nm; (5) Add emulsified pitch to graphite paste and stir at high speed for 1h to evaporate the water. (6) Heat-treat the...

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Abstract

The invention provides a preparation method of carbon negative electrode material and lithium ion battery that uses the material. Emulsified asphalt is prepared by taking water as solvent, graphite is coated by the emulsified asphalt and the composite material is carbonized. The solvent applied by the carbon negative electrode material of the lithium ion battery prepared by the method has low cost, can eliminate solvent contamination and solves the difficulty that a great deal of poisonous organic solvent such as toluene, quinoline, etc. are applied when asphalt is dissolved in the past. By adopting the composite material prepared by the method as cathode of the lithium ion battery, the battery has the advantages of excellent performances, such as good electrolyte compatibility, high efficiency of coulomb during the first charging and discharging, low irreversible capacity and long cycle life, etc.

Description

technical field [0001] The invention relates to a battery electrode material and a battery made of the material, in particular to a lithium ion battery carbon negative electrode material and a lithium ion battery made of the material. Background technique [0002] Lithium-ion battery is a new high-energy green battery successfully developed at the end of the 20th century. Compared with traditional batteries, it has the advantages of high average discharge voltage, large volume specific capacity and mass specific capacity, long discharge time, and light weight. Graphite materials are the mainstream of commercial lithium-ion battery anode materials today. At present, there are two types of materials used in the market: artificial and natural graphite. The problem with graphite as negative electrode is that during the first charge of graphite, solvent molecules and lithium ions are intercalated into the graphite layer together, causing the decomposition of solvent and electrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02H01M4/04H01M4/58H01M10/40H01M4/36H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 杨绍斌沈丁綦瑞萍王勇费晓飞王凤琴于继甫
Owner LIAONING TECHNICAL UNIVERSITY
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