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Electrode material based on polyimide mesocarbon microbead structure and preparation method thereof

A mesophase carbon microsphere and polyimide technology, which is applied in the preparation/purification of carbon, negative electrodes, battery electrodes, etc., can solve the problem of unstable structure of negative electrode materials, unfavorable high-rate charge and discharge, and influence on commercialization process, etc. problems, to achieve the effect of interlayer lithium intercalation and microporous lithium storage, excellent structural stability, and conducive to industrialization

Active Publication Date: 2020-11-17
许绝电工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the graphite material is layered carbon with highly oriented crystallization and the interlayer distance is small, with the intercalation of lithium ions during the charging process, it will be accompanied by the co-intercalation phenomenon of solvent molecules, resulting in the exfoliation of the graphite layer and the structure of the negative electrode material. Instability will eventually lead to battery performance attenuation, which is not conducive to high-rate charge and discharge
Similarly, electrode pulverization caused by tin-based and silicon-based anode materials due to the huge volume effect also seriously affects their commercialization process
In terms of the electrode sheet preparation process, lithium battery negative electrode materials are usually prepared by traditional grinding methods of active materials, conductive agents, and binders. The grinding process is complicated, and with the difference in the performance of the binder, the electrode sheet will crack.

Method used

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  • Electrode material based on polyimide mesocarbon microbead structure and preparation method thereof
  • Electrode material based on polyimide mesocarbon microbead structure and preparation method thereof
  • Electrode material based on polyimide mesocarbon microbead structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Under the protection of nitrogen, add 100ml of NMP solvent to a 250ml three-necked flask, add 2.1628g of diamine monomer PDA and stir for 30min, after the diamine monomer is completely dissolved in the solvent, place the reaction system in an ice water bath Under the conditions, 6.4446g of dianhydride monomer BTDA was added and reacted with high-speed stirring for 8h to obtain a yellow-brown PAA solution.

[0035] (2) Place 100ml of the PAA solution obtained in step (1) in a 200ml autoclave, drop 1ml of isoquinolinone, and heat to 120°C for 1.5h, 170°C for 8h, then cool naturally To normal temperature, a heterogeneous PI-NMP suspension was obtained; the suspension was added to 100ml of NMP, sonicated for 15min, filtered with a sand core funnel, washed with ethanol, and dried under vacuum at 100℃ for 8h to obtain a yellow-brown polyimide powder ( PI).

[0036] (3) In a nitrogen atmosphere, heat up to 100°C at a heating rate of 3°C / min for 0.5~1h, 200°C for 1h, 300°C for ...

Embodiment 2

[0040] (1) Under the protection of nitrogen, add 120ml of DMF solvent into a 250ml three-necked flask, add 4.4822g of diamine monomer BIA and stir for 30min, after the diamine monomer is completely dissolved in the solvent, place the reaction system in an ice-water bath. Then, 6.2002g of dianhydride monomer ODPA was added, and the reaction was stirred at high speed for 8 hours to obtain a yellow-brown PAA solution.

[0041] (2) Place 80ml of the PAA solution obtained in step (1) into a 250ml autoclave, drop 1.5ml of isoquinolinone, heat up to 120℃ for 2h, 160℃ for 12h, then cool naturally To normal temperature, a heterogeneous PI-DMF suspension was obtained; the suspension was added to 120ml DMF, sonicated for 15 minutes, filtered with a sand core funnel, washed with ethanol, and dried in vacuum at 100°C for 8 hours to obtain a yellow-brown polyimide powder ( PI).

[0042] (3) In a nitrogen atmosphere, heat up to 100°C for 0.5h at a heating rate of 3°C / min, sinter at 200°C for 0.5...

Embodiment 3

[0046] (1) Under the protection of nitrogen, add 90ml of DMAc solvent to a 250ml three-necked flask, add 5.2424g of diamine monomer PMR and stir for 30min. After the diamine monomer is completely dissolved in the solvent, place the reaction system in an ice water bath Under conditions, 5.8844 g of dianhydride monomer BPDA was added, and the reaction was stirred at high speed for 12 hours to obtain a yellow-brown PAA solution.

[0047] (2) Place 90ml of the PAA solution obtained in step (1) into a 250ml autoclave, drop 1ml of isoquinolinone, heat up to 120°C for 2h, 160°C for 12h, and then cool to At room temperature, a heterogeneous PI-DMAc suspension was obtained; the suspension was added to 120ml DMAc, ultrasonicated for 20 minutes, filtered with a sand core funnel, washed with ethanol, and dried in vacuum at 100°C for 8 hours to obtain a yellow-brown polyimide powder (PI ).

[0048] (3) In a nitrogen atmosphere, heat up to 100°C at a heating rate of 3°C / min and sinter for 1 hou...

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Abstract

The invention discloses an electrode material based on a polyimide mesocarbon microbead structure and a preparation method of the electrode material. The preparation method comprises the following steps: (1) preparation of a polyamide acid solution; (2) self-assembly reaction of polyimide (PI). (3) carbonization reaction of polyimide. (4) preparation of a template skeleton agent. (5) preparation of an electrode material. With the polyimide as a matrix, the porous, nitrogen-rich and uniform-size mesophase carbon microspheres are prepared through a thermal polycondensation hydrothermal reactionand control of sintering process parameters; the graphite interlayer spacing is increased by means of the unique curved surface effect of the mesophase carbon microspheres, and more structural defectsare provided through induction of the homogeneous nitrogen doping effect, so that lithium ion transmission is facilitated; in addition, during interlayer lithium intercalation, lithium storage micropore sites are increased, so that the electricity storage performance of the electrode material is improved.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrode material based on a polyimide mesophase carbon microsphere structure and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the new energy industry, lithium-ion batteries, as a preferred solution for high-energy batteries, are gradually being widely used in large-scale power grids, power storage, consumer electronics and other fields. The electrode material is an important factor that determines the performance of the battery, and the anode material also directly affects the energy density, cycle life and safety performance of the battery. Graphite, due to its wide range of sources, low price, good electrical conductivity, excellent electrochemical inertness, and low charge and discharge platform, is widely used in commercial lithium ion battery anode materials. However, because the graphite material is a layere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/194H01M4/587H01M10/0525
CPCC01B32/05C01B32/194H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 谭文军王韫斐蔡锟何伟伟李亚胜古洋卢如意高远浩
Owner 许绝电工股份有限公司
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