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A kind of network polymer material for negative electrode of sodium ion battery, its preparation method and sodium ion battery

A technology of polymer materials and sodium-ion batteries, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the difficulty of meeting the commercialization requirements of sodium-ion batteries, the capacity of hard carbon materials is not high, and the thermal stability needs to be improved and other problems, to achieve good industrial prospects, the overall structure is beneficial, and the effect of enriching the pore content

Active Publication Date: 2021-10-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the capacity of hard carbon materials prepared in the prior art is generally not high. When most hard carbons are used as negative electrode materials, their specific capacity at a current density of 1A / g is about 100mAh / g, and at a current density of 5A / g Lower, generally between 50-70mAh / g, it is difficult to meet the requirements of commercialization of sodium-ion batteries
[0005] Chinese patent application CN107098910 has prepared a triazine polymer for the negative electrode of lithium-ion batteries through a solution method, but it can only be polymerized with specific monomers, which has poor flexibility, and the prepared material is not a full aromatic heterocycle structure, thermal stability needs to be improved

Method used

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  • A kind of network polymer material for negative electrode of sodium ion battery, its preparation method and sodium ion battery
  • A kind of network polymer material for negative electrode of sodium ion battery, its preparation method and sodium ion battery
  • A kind of network polymer material for negative electrode of sodium ion battery, its preparation method and sodium ion battery

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preparation example Construction

[0071] The invention provides a method for preparing a sodium-ion battery negative electrode mesh polymer material, comprising the following steps:

[0072] (1) prepare the dinitrile monomer containing N, O and S;

[0073] (2) the obtained dinitrile monomer is mixed with anhydrous zinc chloride to obtain a mixture;

[0074] (3) Under vacuum conditions, the mixture is subjected to a polymerization reaction to obtain a polymerization product;

[0075] (4) Grinding the polymer product into powder, stirring in an acid solution, and then washing until neutral to obtain the network polymer material.

[0076] The applicant found that if the structure of the dinitrile monomer does not contain N, O and S heteroatoms, the performance of the polymer material prepared is not good, and if the molecular structure is small, such as similar terephthalonitrile structure, its prepared Porous materials have more internal micropores, larger specific surface area, and larger non-effective area. ...

Embodiment 1

[0116] A preparation method for a sodium ion battery negative electrode network polymer material, comprising the following steps:

[0117] (1) Synthesis and purification of the dinitrile monomer containing N, O, S, wherein, the structure of the dinitrile monomer is as shown in the following formula:

[0118]

[0119] In the structure of the above formula, Ar1 is a benzene ring, Ar2 is a thiophene ring, and Ar3 is a benzene ring;

[0120] The synthetic method of described dinitrile monomer is specifically as follows:

[0121] a) Reference K.Y.Yuan, C.Liu, J.H.Han, G.P.Yu, J.Y.Wang, H.M.Duan, Z.G.Wang, X.G.Jian, Phthalazinone structure-based covalent triazine frameworks and their gas adsorption and separation properties, RSC Adv.2016, 6, From 12009 to 12020, the preparation, synthesis and purification of the intermediate product PHPZ-CN were carried out; refer to the literature J.H.Han, K.Y.Yuan, C.Liu, J.Y.Wang, X.G.Jian, Donor–acceptor copolymers containing the phthalazino...

Embodiment 2

[0131] The difference between this embodiment and embodiment 1 is that: in step (3), the temperature is raised to 700° C., and the others remain the same as in embodiment 1.

[0132] The specific surface area of ​​the network polymer material of the present embodiment is 1155m 2 / g, the pore volume is 0.71cm 3 / g, the interlayer spacing is 0.374nm, and the contents of N and S are 5.11wt.% and 0.72wt.%, respectively.

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Abstract

The invention belongs to the technical field of sodium ion batteries, and in particular relates to a method for preparing a network polymer material for a negative electrode of a sodium ion battery, comprising the following steps: (1) preparing a dinitrile monomer containing N, O and S; (2) ) mixing the obtained dinitrile monomer with anhydrous zinc chloride to obtain a mixture; (3) under vacuum conditions, the mixture is polymerized to obtain a polymer product; (4) the polymer product is ground into In powder form, it is stirred in acid solution, and then washed to neutrality to obtain the network polymer material. The present invention prepares a porous polymer through a one-step ionothermal method, the prepared monomer is flexible and can be designed, and the thermal stability of the triazine-based material prepared at a higher temperature is better, and because it contains S, O and other heteroatoms, the performance better.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a network polymer material for a negative electrode of a sodium ion battery, a preparation method thereof and a sodium ion battery. Background technique [0002] With the continuous development of human society, energy and environmental issues have become the most concerned issues in the world today. On the one hand, the contradiction between the increasing demand of human society for fossil energy and its limited reserves has become increasingly prominent; on the other hand, environmental problems such as environmental pollution, greenhouse effect, and smog caused by long-term and large-scale use of fossil energy have become increasingly serious. Therefore, Exploring new energy systems is crucial. However, the generation of renewable energy is greatly affected by natural conditions, and has the characteristics of serious intermittency and uneven spatial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/06H01M4/60H01M10/054
CPCC08G73/0644C08G73/065H01M4/608H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 蹇锡高胡方圆刘程张守海王锦艳李楠
Owner DALIAN UNIV OF TECH
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