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Preparation method and application of hard carbon

A hard carbon and biomass technology, which is applied in the preparation/purification of carbon, active material electrodes, electrical components, etc., can solve the problems of high cost, unsatisfactory cycle specific capacity and rate performance, and achieve good cycle life and realize Effects of waste utilization and virtuous cycle, excellent rate performance

Pending Publication Date: 2020-12-11
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle specific capacity and rate performance of currently commercially available hard carbon materials are still not ideal, and the cost is high

Method used

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  • Preparation method and application of hard carbon
  • Preparation method and application of hard carbon
  • Preparation method and application of hard carbon

Examples

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preparation example Construction

[0040] The invention provides a kind of preparation method of hard carbon, comprises the following steps:

[0041] salt leaching the biomass waste powder to obtain the salt leached biomass waste powder;

[0042] The first carbonization, ball milling and second carbonization are performed sequentially on the salted biomass waste powder to obtain the hard carbon.

[0043] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0044] In the invention, the biomass waste powder is subjected to salt leaching to obtain the salt-leached biomass waste powder.

[0045] In the present invention, the biomass waste powder is preferably prepared; the preparation method of the biomass waste powder is preferably: the biomass waste is subjected to ultrasonication, cleaning, drying and crushing in sequence to obtain the biomass waste powder.

[0046] In the present invention, the biomass waste is pr...

Embodiment 1

[0064] Place the coconut shell in distilled water for ultrasonication and cleaning, dry it at a temperature of 60° C., and pulverize it with a pulverizer for 30 minutes to obtain coconut shell powder (with a particle size of 100 to 500 μm);

[0065] Soak 10 g of the coconut shell powder in 0.1 L of potassium carbonate solution with a concentration of 0.1 mol / L for 12 hours, and dry at a temperature of 60° C. to obtain the salted coconut shell powder;

[0066] Under a nitrogen atmosphere, the coconut shell powder after the salt immersion was heated up to 350° C. at a heating rate of 5° C. / min and kept warm for 120 minutes to carry out the first carbonization. After being naturally cooled to room temperature, ball milling (with a diameter of 3 mm) The number ratio of balls and balls with a diameter of 10mm is 3, the ball milling speed is 400rpm, the time is 90min, and the ball-to-material ratio is 1:20), after the second carbonization (nitrogen atmosphere, at a heating rate of 5°...

Embodiment 2

[0070] Place the coconut shell in distilled water for ultrasonication and cleaning, dry it at a temperature of 60° C., and pulverize it with a pulverizer for 30 minutes to obtain coconut shell powder (with a particle size of 100 to 500 μm);

[0071] Soak 10 g of the coconut shell powder in 0.05 L of potassium chloride solution with a concentration of 0.5 mol / L for 12 hours, and dry at a temperature of 60° C. to obtain the salted coconut shell powder;

[0072] Under a nitrogen atmosphere, the coconut shell powder after the salt immersion was heated up to 400° C. at a heating rate of 5° C. / min and kept warm for 120 minutes to carry out the first carbonization. After being naturally cooled to room temperature, ball milling (with a diameter of 3 mm) The number ratio of balls and balls with a diameter of 10mm is 1, the ball milling speed is 600rpm, the time is 90min, and the ball-to-material ratio is 1:30), then carry out the second carbonization (nitrogen atmosphere, with a heating...

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Abstract

The invention relates to the technical field of battery materials, and particularly relates to a preparation method and application of hard carbon. The preparation method provided by the invention comprises the steps of carrying out salt leaching on biomass waste powder to obtain salt-leached biomass waste powder; and sequentially carrying out first carbonization, ball milling and second carbonization on the salt-leached biomass waste powder to obtain the hard carbon. According to the method, firstly, the biomass waste powder is subjected to salt leaching to enable the biomass waste powder tocarry salt ions, and the salt ions can change the microstructure of carbon in the subsequent second carbonization process, so that the performance of hard carbon is influenced; the two-step carbonization process is used for ensuring that a primary carbon structure can be formed and tar substances in the biomass can be removed through first carbonization, so that the relative controllability of thesize of biomass waste powder in the subsequent ball milling process is facilitated, and the formation of a more stable carbon structure can be ensured through second carbonization.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method and application of hard carbon. Background technique [0002] There are various energy sources on the earth, including fossil energy, geothermal energy, wind energy, water energy and solar energy. We can generate energy that can be used by human beings from these resources, but in order to use these energies more conveniently, an efficient electrical energy storage system is required. Lithium (Li) is the lightest metal element with a small ionic radius and has many electrochemical properties. Advantages, such as high energy density, high power density and wide range of operating temperature and good working life. Therefore, Li-ion-based electrical energy storage systems have broad application prospects. [0003] No matter what kind of lithium-ion-based electric energy storage system (lithium-ion battery, lithium-ion capacitor, etc.) will rely on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 邢伟邱智健李彬
Owner SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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