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A kind of spherical hard carbon material and preparation method thereof

A hard carbon and spherical technology, which is applied in the field of spherical hard carbon materials and their preparation, can solve problems affecting the performance of materials, affecting the low-temperature performance of start-stop power supplies, high-rate charge and discharge capabilities, and large-rate performance deviations.

Active Publication Date: 2021-09-03
上海飞鸿创联新能源发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low specific capacity and large rate performance deviation of the prepared material affect the performance of the material, and affect the low temperature performance of the start-stop power supply and the high rate charge and discharge capability in the future.

Method used

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  • A kind of spherical hard carbon material and preparation method thereof

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preparation example Construction

[0024] The invention provides a kind of preparation method of spherical hard carbon material, comprises the following steps:

[0025] (1) mixing the phenolic resin with an organic solvent to obtain a phenolic resin solution;

[0026] (2) mixing the phenolic resin solution obtained in the step (1) with sulfonated polystyrene microspheres and aminosilane, and successively undergoing reflux reaction and elution to obtain a precursor material;

[0027] (3) mixing the precursor material obtained in the step (2) with the lithium salt to obtain a composite material;

[0028] (4) The composite material obtained in the step (3) is subjected to chemical vapor deposition to obtain a spherical hard carbon material.

[0029] In the invention, the phenolic resin is mixed with an organic solvent to obtain a phenolic resin solution. In the present invention, the organic solvent preferably includes N-methylpyrrolidone, carbon tetrachloride, toluene, diphenylamine, N,N-dimethylformamide or n-...

Embodiment 1

[0049] (1) Add 61g of phenolic resin to 1000mL of N-methylpyrrolidone and be prepared with a concentration of phenolic resin solution of 0.5mol / L;

[0050] (2) After adding 1.83g sulfonated polystyrene microspheres in the phenolic resin solution that described step (1) obtains and stir, add 1.83g gamma-aminopropyltrimethoxysilane again, and transfer in the Erlenmeyer flask, And reflux reaction at 70°C for 12h; filter the reflux reaction product, soak the filtered solid in tetrahydrofuran solution for 24h to elute; after the elution is completed, filter the eluted product, dry the filtered solid to obtain a precursor Material;

[0051] (3) Add 5g of lithium acetate to 100mL N-methylpyrrolidone to prepare a lithium salt solution with a mass concentration of 5%; then add 100g of the precursor material obtained in step (2) to the lithium salt solution and stir evenly Finally, filter and dry to obtain the composite material;

[0052] (4) The composite material obtained in the ste...

Embodiment 2

[0054] (1) 12.2g phenolic resin is added in 1000mL carbon tetrachloride and is mixed with the phenolic resin solution that molar concentration is 0.1mol / L;

[0055] (2) After adding 0.122g sulfonated polystyrene microspheres in the phenolic resin solution obtained in the step (1) and stirring evenly, then add 0.122g 3-aminopropyltriethoxysilane, and transfer to the Erlenmeyer flask and reflux reaction at 30°C for 24h; filter the reflux reaction product, soak the filtered solid in tetrahydrofuran solution for 6h to elute; after the elution is completed, filter the eluted product, and dry the filtered solid to obtain Precursor material;

[0056] (3) Add 1g butyllithium to 1000mL carbon tetrachloride to prepare a lithium salt solution with a mass concentration of 1%; then add 100g of the precursor material obtained in step (2) to the lithium salt solution and stir evenly Finally, filter and dry to obtain the composite material;

[0057] (4) The composite material was subjected ...

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Abstract

The invention provides a spherical hard carbon material and a preparation method thereof, belonging to the technical field of preparation of lithium ion battery materials. The sulfonic acid groups of the sulfonated polystyrene microspheres in the present invention chemically react with the amino groups in the aminosilane to form a structurally stable polystyrene / silane spherical material, and then the polystyrene is removed by elution to obtain a polystyrene with holes. Precursor material, and then add lithium salt to the precursor material, the lithium salt is well embedded in the pores of the precursor material, which reduces the irreversible capacity of the hard carbon material and increases the intercalation rate of lithium ions during charge and discharge. The data of the embodiment shows that: the first discharge capacity of the spherical hard carbon material provided by the present invention is 575~600mAh / g, and the first efficiency is 90~92%; the rate performance at 5C / 0.1C is 96.5~98%; at 0.5 200 cycles at C / 0.5C, the capacity retention rate is 98-99%.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a spherical hard carbon material and a preparation method thereof. Background technique [0002] With the improvement of the fast charging ability, low temperature performance and rate pulse performance of lithium-ion batteries used in the start-stop power supply of automobiles, the negative electrode materials used in lithium-ion batteries are required to have high lithium ion migration rate and large layer spacing, so as to improve the low temperature of the material. Continuous discharge start-up capability under certain conditions, stronger charge acceptance capability and high power performance, etc. The current anode materials are mainly artificial graphite, which has the advantages of stable structure, excellent cycle performance at small rates, high storage performance at high temperature, and low cost. However, at the same time, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 李涛
Owner 上海飞鸿创联新能源发展有限公司
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