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Preparation method of graphitized carbon negative electrode material

A technology of graphitized carbon and negative electrode materials, applied in the field of lithium ion batteries, can solve the problems of increased battery impedance, battery capacity loss, and large lithium ion diffusion resistance.

Pending Publication Date: 2017-06-13
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon / graphite negative electrode has the following defects: (1) The first charge will form a solid electrolyte film (SEI) on the surface of the carbon particles, resulting in a loss of battery capacity, and the amount of SEI film formation increases with the increase in the number of charge-discharge cycles, while the internal impedance of the battery (2) During high-rate fast charging, lithium coatings are easily formed on the surface of carbon particles, and even lithium dendrites are formed to cause battery safety problems, and due to the presence of SEI films on the surface of carbon particles, the The high resistance to electron movement and lithium ion diffusion causes the temperature of the battery to rise too fast, and it is easy to approach or exceed the melting temperature of the battery separator, resulting in poor operation, and the performance of resistance to extreme temperatures and abuse needs to be improved; (3) The actual use of lithium-ion batteries is not Constant temperature process, after repeated charge and discharge cycles under variable temperature conditions, the expansion or contraction of the host electrode structure caused by the insertion or deintercalation of guest lithium ions will gradually damage the electrode structure, which has a great impact on the long-term cycle stability and life of the battery

Method used

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  • Preparation method of graphitized carbon negative electrode material
  • Preparation method of graphitized carbon negative electrode material
  • Preparation method of graphitized carbon negative electrode material

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preparation example Construction

[0030] The invention provides a method for preparing a graphitized carbon negative electrode material, comprising the following steps:

[0031] 1) Calcining the fatty acid at a temperature of 600-800° C. for 6-8 hours in a nitrogen atmosphere, and obtaining amorphous carbon after cooling;

[0032] 2) Calcining the amorphous carbon obtained in step 1) in a nitrogen atmosphere at a temperature of 2500-2800° C. for 4-6 hours, and cooling to obtain graphitized carbon;

[0033] 3) Dispersing the graphitized carbon obtained in step 2) and a certain amount of nitrogen-containing polymer in absolute ethanol, mixing evenly, spraying into balls to form a precursor, and then collecting the precursor through a cyclone separator;

[0034] 4) carbonizing the precursor obtained in step 3) in a nitrogen atmosphere at a temperature of 800-1000° C. for 2-4 hours, and obtaining porous graphitized carbon after cooling;

[0035] 5) Disperse the porous graphitized carbon obtained in step 4) and a ...

Embodiment 1

[0040] Weigh 8.5g of lauric acid and put it into a tube furnace, calcinate in a nitrogen atmosphere at a temperature of 600°C for 8h, and obtain amorphous carbon after cooling; then calcinate the amorphous carbon in a nitrogen atmosphere at a temperature of 2500°C for 6h , naturally cooled to room temperature to obtain graphitized carbon; then graphitized carbon and polypyrrole were dispersed in absolute ethanol according to a mass ratio of 1:1, and sprayed into balls after 0.5h of ultrasonic dispersion and 2h of magnetic stirring, wherein, The inlet temperature of the spray into balls is about 190°C, the outlet temperature is about 130°C, and then the precursor is collected by a cyclone separator; next, the precursor is carbonized in a nitrogen atmosphere at a temperature of 800°C for 4 hours, and porous graphitization is obtained after cooling Carbon: Finally, disperse 4g of porous graphitized carbon and 1g of sucrose in 50mL of deionized water, transfer them to a watch glass...

Embodiment 2

[0042] Weigh 9.0g of myristic acid and put it into a tube furnace, calcinate in a nitrogen atmosphere at a temperature of 800°C for 6 hours, and obtain amorphous carbon after cooling; then calcinate the amorphous carbon in a nitrogen atmosphere at a temperature of 2800°C 4h, naturally cooled to room temperature to obtain graphitized carbon; then graphitized carbon and polypyrrole were dispersed in absolute ethanol at a mass ratio of 1:1, and sprayed into balls after 0.5h of ultrasonic dispersion and 2h of magnetic stirring, wherein , the inlet temperature of the spray into balls is about 190°C, the outlet temperature is about 130°C, and then the precursor is collected by a cyclone separator; next, the precursor is carbonized for 2 hours at a temperature of 1000°C in a nitrogen atmosphere, and porous graphite is obtained after cooling carbonization; finally, 5 g of porous graphitized carbon and 1.2 g of citric acid were dispersed in 60 mL of deionized water, transferred to a wat...

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Abstract

The invention provides a preparation method of a graphitized carbon negative electrode material. The preparation method comprises the following steps: 1) calcining fatty acid in a nitrogen atmosphere at the temperature of 600-800 DEG C for 6-8h and cooling, so as to obtain amorphous carbon; 2) calcining the amorphous carbon in a nitrogen atmosphere at the temperature of 2,500-2,800 DEG C for 4-6h and cooling, so as to obtain graphitized carbon; 3) dispersing the graphitized carbon and a certain amount of nitrogenous polymers into anhydrous ethanol, uniformly mixing the mixture, atomizing to form balls and collecting precursors with a cyclone separator; 4) carbonizing the precursors in a nitrogen atmosphere at the temperature of 800-1,000 DEG C for 2-4h and cooling, so as to obtain porous graphitized carbon; 5) dispersing the porous graphitized carbon and a certain amount of sucrose into deionized water, uniformly mixing the mixture and performing air blast drying on the mixture at the temperature of 120-150 DEG C; carbonizing the mixture in a nitrogen atmosphere at the temperature of 800-1,000 DEG C for 2-3h and cooling, so as to obtain N-doped carbon-coated porous graphitized carbon.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a graphitized carbon negative electrode material. [0003] 【Background technique】 [0004] Carbon / graphite materials have high theoretical specific energy, are cheap and easy to obtain, and have mature preparation processes, so they are widely used as anode materials for lithium-ion batteries. However, the carbon / graphite negative electrode has the following defects: (1) The first charge will form a solid electrolyte film (SEI) on the surface of the carbon particles, resulting in a loss of battery capacity, and the amount of SEI film formation increases with the increase in the number of charge-discharge cycles, while the internal impedance of the battery (2) During high-rate fast charging, lithium coatings are easily formed on the surface of carbon particles, and even lithium dendrites are formed to cause battery safety problems, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/184
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 伍伟焦奇方杨泛明
Owner OPTIMUM BATTERY CO LTD
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