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Hard carbon-like graphite cathode material for high-rate lithium ion battery and preparation method thereof

A lithium-ion battery, graphite anode technology, applied in battery electrodes, carbon preparation/purification, negative electrodes, etc., can solve the problems of poor fast charge and discharge performance, high crystallinity, small interlayer spacing, etc., to achieve stable product properties, The effect of high retention and large carbon layer spacing

Active Publication Date: 2019-04-16
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects and deficiencies in the prior art of high crystallinity, small interlayer spacing, relatively developed lamellar orientation, obvious anisotropy characteristics, and poor fast charge and discharge performance of the main body graphite of graphite materials, and provide a A kind of preparation method of class hard carbon graphite negative electrode material for lithium-ion battery with high rate

Method used

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  • Hard carbon-like graphite cathode material for high-rate lithium ion battery and preparation method thereof
  • Hard carbon-like graphite cathode material for high-rate lithium ion battery and preparation method thereof
  • Hard carbon-like graphite cathode material for high-rate lithium ion battery and preparation method thereof

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Embodiment 1

[0054] The present embodiment provides a kind of hard carbon graphite negative electrode material for high-rate lithium-ion batteries, and its preparation method (all the other embodiments are the same) comprises the following preparation steps:

[0055] S1: Grinding the thermoplastic polymer to a micron size to obtain a polymer powder;

[0056] S2: Disperse the polymer powder in an aqueous solution containing an oxidizing agent and a surfactant, carry out a liquid-phase low-temperature oxidation reaction under stirring conditions at 80-180°C, cross-link to obtain an oxidized product, and then pyrolyze the oxidized product to obtain oxygen-enriched carbon Precursor; the mass ratio of the polymer powder to the oxidizing agent is 100:20-50;

[0057] S3: Pulverize the oxygen-rich carbon precursor and graphitize it to obtain a hard carbon-like graphitized carbon powder;

[0058] S4: depolymerize and sieve the hard carbon-like graphitized carbon powder to obtain the hard carbon-li...

Embodiment 2

[0062] This embodiment provides a hard carbon-like graphite negative electrode material for a high-rate lithium-ion battery, which is prepared by the following preparation method.

[0063] The high-temperature coal tar pitch (softening point is 250°C) is pulverized by air flow to make a powder with a volume average particle diameter D50 of 5 μm; Mix to make a water slurry with a solid content of 50%, and dry it in a heated stirring tank at 180°C for 4 hours to carry out oxidation reaction, and discharge it after cooling to room temperature to obtain oxidized asphalt powder; then put it into a rotary kiln and Under the protection of nitrogen, the temperature was raised to 1000°C for 2 hours, and the temperature was lowered to room temperature to discharge; then it was crushed by air flow to make a powder with a volume average particle size D50 of 8 μm, and it was carried out at 2800°C under the protection of an inert gas. Graphitization at high temperature for 12 hours, cooling...

Embodiment 3

[0065] This embodiment provides a hard carbon-like graphite negative electrode material for a high-rate lithium-ion battery, which is prepared by the following preparation method.

[0066] The coumarone resin is pulverized by airflow to make a powder with a volume average particle diameter D50 of 5 μm; the obtained resin powder is mixed with nitric acid and Tween 20 with a mass concentration of 20% according to a mass ratio of 100:30:2 Make a water slurry with a solid content of 50% and dry it in a heated stirring tank at 100°C for 8 hours for oxidation reaction. After cooling to room temperature, the oxidized resin powder is obtained; then put it into a rotary kiln and protect it under nitrogen Heat up to 1000°C at 2°C / min for 2 hours, cool down to room temperature and discharge; then use jet milling to make a powder with a volume average particle size D50 of 8 μm, and graphitize at 2600°C under the protection of an inert gas High-temperature treatment for 24 hours, cooling t...

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Abstract

The invention relates to a hard carbon-like graphite cathode material for a high-rate lithium ion battery and a preparation method thereof. The preparation method comprises the following steps of S1,crushing a thermoplastic polymer to obtain polymer powders; S2, dispersing polymer powders in an aqueous solution containing an oxidizing agent and a surfactant for liquid-phase low-temperature oxidation reaction crosslinking, and then pyrolyzing to obtain an oxygen-rich carbon precursor; S3, crushing and graphitizing the oxygen-rich carbon precursor to obtain hard carbon-like graphitized carbon powders; S4, depolymerizing and screening the hard carbon-like graphitized carbon powders to obtain the hard carbon-like graphite cathode material. According to the preparation method, the thermoplastic polymer is used as a raw material, the isotropic oxygen-rich carbon precursor is obtained through liquid-phase low-temperature oxidation crosslinking and pyrolysis treatment, and then the hard carbon-like graphite negative electrode material with low orientation degree and large interlayer spacing is obtained through graphitization treatment, so that the charge-discharge rate performance of thematerial is improved; and when the material is used in the lithium ion battery, the charge-discharge rate can reach more than 15C.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a hard carbon-like graphite negative electrode material for high-rate lithium-ion batteries and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in 3C, power and energy storage fields. Among them, the lithium-ion power battery market has become the largest engine of rapid growth in the global lithium battery market. With the improvement of consumers' comprehensive requirements for electric vehicles, lithium-ion batteries with fast charging and discharging speeds are increasingly favored by the market. As the core component of lithium-ion batteries, the negative electrode material is an important factor restricting the fast charging ability of lithium-ion batteries. At present, the anode materials that have been marketed are mainly graphite materials. Graphite has excellent stability (chemical sta...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/205H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525C01B32/05C01B32/205H01M2004/021H01M2004/027Y02E60/10
Inventor 葛传长曾繁俊范拯华苗荣荣吴志红
Owner SHANGHAI SHANSHAN TECH CO LTD
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