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Heteroatom in-situ doped porous carbon composite lithium negative electrode and preparation method and application thereof

An in-situ doping and heteroatom technology is applied in the field of porous carbon composite lithium anode and its preparation, which can solve the problems of inability to effectively improve lithium deposition-dissolution behavior and difficulty in improving battery performance.

Pending Publication Date: 2022-01-28
重庆硕盈峰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

[0004] The present invention intends to provide a heteroatom in-situ doped porous carbon composite lithium negative electrode to solve the technical problem that the existing lithium negative electrode preparation method cannot effectively improve the deposition-dissolution behavior of lithium, which makes it difficult to improve battery performance.

Method used

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  • Heteroatom in-situ doped porous carbon composite lithium negative electrode and preparation method and application thereof
  • Heteroatom in-situ doped porous carbon composite lithium negative electrode and preparation method and application thereof
  • Heteroatom in-situ doped porous carbon composite lithium negative electrode and preparation method and application thereof

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preparation example Construction

[0038] (1) Preparation of hypercrosslinked polymer precursor

[0039] Solvothermal method

[0040] Adding reaction monomers, cross-linking agents, and catalysts into the solvent to obtain a reaction mixture; transferring the reaction mixture to a reaction kettle, and reacting at 60-100° C. for 10-36 hours to obtain a reaction product; the reaction product is washed, Purify and vacuum dry to obtain a hypercrosslinked polymer precursor; the volume ratio of the reaction monomer to the crosslinking agent is 0.5:4-2:1.

[0041] Solution method

[0042] Add the reaction monomer into the solvent, then add the cross-linking agent in the protective atmosphere, then add the catalyst, and react under reflux at 60-100°C for 10-36 hours to obtain the reaction product; the reaction product is washed, purified and vacuum-dried, A hypercrosslinked polymer precursor is obtained; the molar ratio of the reactive monomer to the crosslinking agent is 0.5:4-2:1.

[0043] In this scheme, the cros...

Embodiment 1

[0049] Embodiment 1 (solution method)

[0050] (1) Add 0.05mol of monomer aniline to 100mL 1,2-dichloroethane, 2 Add 0.1mol dimethoxyethane (FDA) under protection, stir well to make it evenly mixed;

[0051] (2) Add 0.1 mol ferric chloride, stir at 45°C for 5 hours for pre-polymerization, heat up to 80°C and reflux for 19 hours. The product was repeatedly washed with methanol and ultrapure water, purified by a Soxhlet extractor for 24 hours, and dried under vacuum at 70°C for 24 hours to obtain a hypercrosslinked polymer precursor, denoted as HCP-An;

[0052] (3) 1.0g precursor HCP-An and 4.0g KOH were mixed well, and 2 Under protection, the temperature was raised to 900°C at a rate of 5°C / min, kept for 2h, cooled to 30°C, washed thoroughly with 2M hydrochloric acid and ultrapure water respectively, and the final product was vacuum-dried at 50°C for 24h to obtain nitrogen-doped porous carbon NPC-An-900.

Embodiment 2

[0053] Embodiment 2 (solvothermal method)

[0054] (1) Add 1mL of pyrrole monomer to 30mL of solvent 1,2-dichloroethane, add 3mL of FDA for ultrasonic dispersion to mix evenly, then add 5g of ferric chloride, and mix well;

[0055] (2) Transfer the above solution to the polytetrafluoroethylene liner of the stainless steel reactor, and react at 90°C for 20h;

[0056] (3) Wash the product repeatedly with methanol and ultrapure water, purify it with a Soxhlet extractor for 24 hours, and dry it under vacuum at 70°C for 24 hours to obtain a hypercrosslinked polymer precursor, which can be recorded as HCP-Py;

[0057] (4) 1.0g of precursor HCP-Py and 4.0g of KOH were mixed well, raised to 900°C at a rate of 5°C / min under the protection of Ar, kept for 2h, cooled to 30°C, and then washed with 1.5M hydrochloric acid and ultrapure After fully washing with water, the final product was vacuum-dried at 70 °C for 24 h to obtain the oxygen-doped porous carbon NPC-Py-900.

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Abstract

The invention relates to the technical field of electrochemistry and new energy materials, in particular to a heteroatom in-situ doped porous carbon composite lithium negative electrode and a preparation method and application thereof. The heteroatom in-situ doped porous carbon composite lithium negative electrode comprises the following raw materials: a porous carbon material and lithium, the porous carbon material comprises a carbon framework containing a pore structure, the carbon framework is uniformly doped with heteroatoms, and the heteroatoms comprise at least one of nitrogen, oxygen, phosphorus and sulfur. According to the scheme, the technical problem that the battery performance is difficult to improve due to the fact that an existing lithium negative electrode and a preparation method thereof cannot effectively improve the deposition-dissolution behavior of lithium is solved. According to the scheme, the three-dimensional porous carbon framework containing the electronegative functional group is used, the deposition-dissolution behavior of lithium is directionally regulated and controlled, and the prepared heteroatom in-situ doped porous carbon composite lithium negative electrode has a wide application prospect in the fields of liquid lithium ion batteries and solid lithium batteries.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a heteroatom in-situ doped porous carbon composite lithium negative electrode and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in consumer electronics, electric vehicles and large-scale energy storage. Due to the rapid development of consumer electronics and the long-range requirements of electric vehicles, there is an urgent need to increase the energy density of lithium-ion batteries. The theoretical energy density of lithium-ion batteries with graphite as the negative electrode is about 250Wh / kg, and the theoretical capacity of the negative electrode material is 372mAh / g, which gradually cannot meet people's growing demand for high energy density batteries. [0003] The theoretical capacity of metal lithium is as high as 3860mAh / g, and the electrode po...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/382H01M4/625H01M10/052H01M2004/027H01M2004/021Y02E60/10
Inventor 徐静静闫兴陆仕荣胡超蔡松明蔡兴云
Owner 重庆硕盈峰新能源科技有限公司
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