A kind of hard carbon graphite negative electrode 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, small interlayer spacing, high crystallinity, and achieve stable product properties, large The effect of high carbon layer spacing and retention

Active Publication Date: 2022-07-05
SHANGHAI SHANSHAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
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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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  • A kind of hard carbon graphite negative electrode material for high rate lithium ion battery and preparation method thereof
  • A kind of hard carbon graphite negative electrode material for high rate lithium ion battery and preparation method thereof
  • A kind of hard carbon graphite negative electrode material for high rate lithium ion battery and preparation method thereof

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Embodiment 1

[0054] The present embodiment provides a hard carbon graphite-like negative electrode material for a high-rate lithium ion battery, and the preparation method (the other embodiments are the same as this) includes the following preparation steps:

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

[0056] S2: Disperse the polymer powder in an aqueous solution containing an oxidant 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-rich carbon a precursor; the mass ratio of the polymer powder to the oxidant is 100:20-50;

[0057] S3: pulverize the oxygen-rich carbon precursor, and obtain a hard carbon-like graphitized carbon powder after graphitization;

[0058] S4: Deaggregate the hard carbon-like graphitized carbon powder and sieve to obtain a hard carbon-like graphite nega...

Embodiment 2

[0062] This embodiment provides a hard carbon graphite-like 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 of 250°C) is pulverized by air flow to make powder with a volume average particle size D50 of 5 μm; The mixture was mixed to make water slurry with a solid content of 50% and dried in a heated stirring tank at 180 ° C for 4 hours for oxidation reaction. After cooling to room temperature, the material was discharged to obtain oxidized asphalt powder; Under nitrogen protection, the temperature was raised to 1000°C for 2 hours, and the temperature was lowered to room temperature for discharging; then it was pulverized by air flow to make powder with a volume average particle size D50 of 8 μm, and the process was carried out at 2800°C under the protection of inert gas. After being graphitized at high temperature for 12 hours, cooled to room te...

Embodiment 3

[0065] This embodiment provides a hard carbon graphite-like 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 air flow to prepare a powder with a volume average particle size D50 of 5 μm; the obtained resin powder is mixed with nitric acid and Tween 20 with a mass concentration of 20% in a mass ratio of 100:30:2 A water slurry with a solid content of 50% was made and dried in a heated stirring tank at 100°C for 8 hours for oxidation reaction, cooled to room temperature and discharged to obtain oxidized resin powder; It was heated to 1000°C for 2 hours at 2°C / min, and then cooled to room temperature for discharging; then it was pulverized by air flow to make powder with a volume average particle size D50 of 8 μm, and graphitized at 2600°C under the protection of inert gas. After being treated at high temperature for 24 hours, cooled to room temperature, and then m...

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Abstract

The invention relates to a hard carbon graphite-like negative electrode material for high-rate lithium ion batteries and a preparation method thereof. The preparation method includes the following steps: S1: pulverizing the thermoplastic polymer to obtain polymer powder; S2: dispersing the polymer powder in an aqueous solution containing an oxidizing agent and a surfactant to carry out liquid phase low-temperature oxidation reaction crosslinking, and then Pyrolysis to obtain oxygen-enriched carbon precursor; S3: pulverize the oxygen-enriched carbon precursor, and graphitize to obtain hard-carbon-like graphitized carbon powder; S4: depolymerize and sieve the hard-carbon-like graphitized carbon powder, namely It is a kind of hard carbon graphite anode material. The preparation method provided by the invention takes thermoplastic polymer as raw material, adopts liquid-phase low-temperature oxidative crosslinking and pyrolysis treatment to obtain isotropic oxygen-rich carbon precursor, and then obtains low-orientation and large interlayer spacing through graphitization treatment. The hard carbon graphite anode material improves the charge-discharge rate performance of the material. When used in lithium-ion batteries, 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 graphite-like 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 the fields of 3C, power and energy storage. Among them, the lithium-ion power battery market has become the largest engine for the rapid growth of the global lithium battery market. With the improvement of consumers' comprehensive requirements for electric vehicles, lithium-ion batteries with fast charging and discharging speed are increasingly favored by the market. As the core component of lithium batteries, the negative electrode material is an important factor restricting the fast charging capability of lithium ion batteries. At present, the marketed anode materials are mainly graphite materials. Graphite has excellent stability (chemical stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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