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Nitrogen-doped carbon electrode material and preparation method thereof

A carbon electrode and nitrogen doping technology, applied in the preparation/purification of carbon, negative electrode, battery electrode, etc., can solve the problems that hinder the practical application of lithium-ion batteries, low theoretical specific capacity, etc.

Pending Publication Date: 2021-09-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its low theoretical specific capacity (372mAh / g) has always been a shortcoming in its development, hindering the practical application of lithium-ion batteries.

Method used

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  • Nitrogen-doped carbon electrode material and preparation method thereof
  • Nitrogen-doped carbon electrode material and preparation method thereof
  • Nitrogen-doped carbon electrode material and preparation method thereof

Examples

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Embodiment 1

[0032] A method for preparing a nitrogen-doped carbon electrode material, comprising the following steps:

[0033] (1) prepare nitrogen-containing copolymerized polymer emulsion by seed emulsion polymerization according to the following steps:

[0034] (a) 25g of acrylonitrile, 24g of styrene and 1g of divinylbenzene (DVB) were mixed uniformly to obtain a mixed monomer;

[0035] (b) 100g of water and 1g of SDS are added to the reaction kettle equipped with thermometer, heating temperature controller, stirrer, feeding tube and azeotropic condensation reflux tube, stirred and dispersed for 10 minutes, then weighed 5g of step (a) Add the mixed monomers into the reactor and raise the temperature to 78°C;

[0036] (c) Weigh 0.25g of KPS and dissolve in 50g to make a KPS aqueous solution with a concentration of 0.5wt%, take 25g of it and directly add it to the reactor, and react for 15 minutes;

[0037] (d) Add the remaining aqueous initiator solution and the remaining mixed monom...

Embodiment 2

[0044] A method for preparing a nitrogen-doped carbon electrode material, comprising the following steps:

[0045] (1) prepare polymer emulsion by seed emulsion polymerization, the steps that it comprises are as follows:

[0046] (a) 30g of acrylonitrile, 19g of styrene and 1g of divinylbenzene (DVB) were weighed and mixed uniformly to obtain a mixed monomer;

[0047] (b) Add 100g of water, 1g of DBS and 0.5g of OP-10 into a reaction kettle equipped with a thermometer, a heating temperature controller, an agitator, a feeding tube and an azeotropic condensing reflux tube, stir and disperse for 15 minutes, and then weigh 5g of the mixed monomer of step (a) was added into the reactor, and the temperature was raised to 80°C;

[0048] (c) Weigh 0.3g of APS and dissolve it in 50g of water, and directly add 25g of APS aqueous solution into the reactor, and react for 20 minutes;

[0049] (d) Add the remaining aqueous initiator solution and the remaining mixed monomers dropwise into ...

Embodiment 3

[0056] A preparation method of nitrogen-doped carbon electrode material (lithium vanadium phosphate / carbon), comprising the following steps:

[0057] (1) prepare polymer emulsion by seed emulsion polymerization, the steps that it comprises are as follows:

[0058] (a) 35g of acrylonitrile, 14g of butyl acrylate (BA) and 1g of divinylbenzene (DVB) were weighed and mixed uniformly to obtain a mixed monomer;

[0059] (b) Add 100g of water and 1.5g of SDS to the reaction kettle equipped with thermometer, heating temperature controller, stirrer, feeding tube and azeotropic condensation reflux tube, stir and disperse for 20 minutes, then weigh 5g of step (a) Add the mixed monomers into the reactor and raise the temperature to 75°C;

[0060] (c) Weigh 0.4g KPS and dissolve it in 50g of water, and directly add 25g of KPS aqueous solution into the reactor, and react for 30 minutes;

[0061] (d) Add the remaining aqueous solution of the initiator and the remaining mixed monomers to th...

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Abstract

The invention discloses a nitrogen-doped carbon electrode material, which is prepared by the following steps of removing electrolyte from polymer emulsion prepared from acrylonitrile and other monomers, adding electrolyte solution, standing to form polymer hydrogel, drying the polymer hydrogel, and carrying out two-step heat treatment of oxidation and carbonization to obtain the nitrogen-doped carbon electrode material. The invention also provides a preparation method of the nitrogen-doped carbon electrode material. The method has the following advantages that the nitrogen with electrochemical activity in the obtained material can change the conductivity and interface stability of the carbon material and improve the reaction kinetics of a carbon-based electrode, so that the structural stability and lithium storage performance of the carbon negative electrode material of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a nitrogen-doped carbon electrode material and a preparation method thereof. Background technique [0002] Graphite carbon has the advantages of high electronic conductivity, good crystallinity and low charge-discharge platform, and is a good choice for lithium-ion battery anode materials. However, its low theoretical specific capacity (372mAh / g) has always been a shortcoming in its development, hindering the practical application of lithium-ion batteries. Atom doping such as doping nitrogen atoms and boron atoms is a good way to improve the electrochemical performance of graphite carbon negative electrodes. Nitrogen is a lithium-friendly element that can change the charge distribution of carbon atoms and improve its material properties. The introduction of nitrogen can also More lithium ion defect vacancies can be generated, thereb...

Claims

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Application Information

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IPC IPC(8): C01B32/05C08F220/44C08F212/08C08F220/18C08F212/36C08F2/26C08F2/30H01M4/583H01M10/0525
CPCC01B32/05C08F220/44C08F2/26C08F2/30H01M4/583H01M10/0525H01M2004/027C08F212/08C08F212/36C08F220/1804Y02E60/10
Inventor 谢德龙金艳李冲谢于辉吴华陈鑫智梅毅
Owner KUNMING UNIV OF SCI & TECH
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