Low-temperature fast-charging artificial graphite negative electrode material, preparation method and low-temperature fast-charging battery

An artificial graphite negative electrode, low temperature technology, applied in the direction of negative electrode, battery electrode, secondary battery, etc., can solve the problem of affecting the charging and discharging performance of the material, peeling off the surface coating, reducing the specific capacity of the material, etc., to achieve superior high current charging. Discharge performance, small diffusion resistance, effect of improving diffusion performance

Pending Publication Date: 2021-12-28
上海昱瓴新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a metal catalyst, and a large amount of metal impurities remain on the surface of the obtained material, which affects the charge and discharge performance of the material and reduces the specific capacity of the material.
It uses a one-step cooling method to cause the material stress to release too quickly, resulting in the peeling off of the surface coating layer, and the low-temperature fast charging performance of the material is still poor

Method used

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  • Low-temperature fast-charging artificial graphite negative electrode material, preparation method and low-temperature fast-charging battery
  • Low-temperature fast-charging artificial graphite negative electrode material, preparation method and low-temperature fast-charging battery

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preparation example Construction

[0038] The preparation method of the low-temperature fast-charging artificial graphite negative electrode material of the present invention comprises the following steps:

[0039] 1. Crushing and spheroidizing:

[0040] The raw materials are pulverized and spheroidized to obtain graphite precursor powder. The raw materials used are one or more of petroleum coke or pitch coke or graphite electrode joint powder with a particle size of less than 10mm. The particle size D50 of the graphite precursor powder is 2-7 microns.

[0041] 2. High temperature purification:

[0042] Put the graphite precursor powder into a high-temperature purification furnace, pass in an inert protective gas, and raise the temperature to 2600-3000°C at a heating rate of 1-20°C / min, and at the same time pass in the purification gas chlorine or Freon, and keep it warm for 1-96h , and then stop feeding the purified gas chlorine or freon, and cool with the furnace under the condition of inert protective gas...

Embodiment 1

[0056] Petroleum coke with a particle size of less than 10 mm is pulverized by a mechanical mill and a shaper, and shaped into balls until the particle size D50 is 5 microns to obtain graphite precursor powder. Put the graphite precursor powder into a push boat type high-temperature graphite purification furnace, pass in an inert protective gas, raise the temperature to 2600°C at a heating rate of 10°C / min, pass in the purified gas chlorine, keep it for 96 hours, and then stop the flow Enter the purified gas chlorine, and cool with the furnace under the condition of inert protective gas to obtain the graphite matrix.

[0057] Put 10Kg of the obtained graphite matrix into the hearth of the rotary kiln; rotate the hearth at a speed of 10rpm, raise the temperature at a speed of 15°C / min, and at the same time feed inert protective gas nitrogen at a flow rate of 500L / h, when the temperature reaches 1100°C , adjust the flow rate of inert protection gas nitrogen to 2000L / h, feed cata...

Embodiment 2

[0061] Petroleum coke with a particle size of less than 10 mm is pulverized by a mechanical mill and a shaper, and shaped into balls until the particle size D50 is 2 microns to obtain graphite precursor powder. Put the graphite precursor powder into a push boat type high-temperature graphite purification furnace, pass in an inert protective gas, raise the temperature to 2800°C at a heating rate of 1°C / min, pass in the purified gas Freon, keep it warm for 48 hours, and then stop the flow Inject the purified gas Freon, cool with the furnace under the condition of inert protective gas, and obtain the graphite matrix.

[0062] Put 10Kg of the obtained graphite matrix into the hearth of the rotary kiln; rotate the hearth at a speed of 10rpm, raise the temperature at a speed of 3°C / min, and at the same time feed inert protective gas nitrogen at a flow rate of 250L / h, when the temperature reaches 1100°C , adjust the flow rate of the inert protection gas nitrogen to 1000L / h, and simul...

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Abstract

The invention relates to a low-temperature fast-charging artificial graphite negative electrode material and a preparation method thereof, and a low-temperature fast-charging battery. The composite material comprises a graphite matrix, and carbon nanotubes and amorphous carbon coating the surface of the graphite matrix. The mass of the carbon nanotubes and the amorphous carbon is 0.5-5% of the mass of the graphite matrix; in the preparation process, petroleum coke, pitch coke or graphite electrode joint powder is adopted as a raw material, and after crushing, shaping and spheroidizing and high-temperature purification, CVD (Chemical Vapor Deposition) carbon coating is performed to obtain the low-temperature quick-charge artificial graphite negative electrode material. Compared with the prior art, the small-particle-size graphite single particles used in the invention have better low-temperature fast charging performance; a high-temperature purification mode is adopted, so that the graphite has higher purity and crystallinity; by adopting a two-step cooling mode, internal stress generated in the material preparation process can be eliminated; a battery prepared from the low-temperature fast-charging artificial graphite negative electrode material has relatively high energy density and good low-temperature fast-charging performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a low-temperature fast-charging artificial graphite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, the country has vigorously promoted new energy electric vehicles, but the charging time of electric vehicle batteries is long, and the battery performance is greatly reduced in cold winter weather, which hinders the promotion of electric vehicles. Therefore, it is urgent to improve the low-temperature fast charging performance of lithium-ion batteries . The improvement of the performance of lithium-ion batteries mainly depends on the improvement of the electrochemical performance of the electrode materials. Therefore, it is of great significance to improve the charge-discharge characteristics of anode materials while maintaining superior cycle performance. In the prior art, low-temperature fast-charging graphite ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 刘萍胡文良陈辉王磊高瑞星徐怀良
Owner 上海昱瓴新能源科技有限公司
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