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Polyimide Conductive Binder for Silicon-Based Anodes of Li-ion Batteries

A conductive binder and lithium-ion battery technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as inability to greatly increase energy density, low load capacity, unstable electrode structure, etc., and achieve technological The conditions are convenient and feasible, the energy density is improved, and the electrochemical performance is excellent.

Active Publication Date: 2022-02-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the existing problems in the background technology, that is, the low energy density caused by the low conductivity of the silicon-based negative electrode of the lithium-ion battery, which cannot greatly increase the loading of the active material in the electrode, and the instability of the electrode structure during the cycle, etc. problem, a polyimide conductive adhesive was designed

Method used

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  • Polyimide Conductive Binder for Silicon-Based Anodes of Li-ion Batteries
  • Polyimide Conductive Binder for Silicon-Based Anodes of Li-ion Batteries
  • Polyimide Conductive Binder for Silicon-Based Anodes of Li-ion Batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The specific operation method of preparing conductive adhesive is as follows:

[0043] Add 0.4746g (3 mmol) of 1,5-naphthalene diamine and 0.631g (3 mmol) of 4,4-biphenyldicarbaldehyde into a three-necked flask, add 10ml of DMSO as a solvent, and stir evenly with magnetic force;

[0044] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 90°C, and react for 12 hours to obtain a conductive adhesive solution.

[0045] The above solution was dialyzed 3 times with DMSO (the volume ratio of binder solution to DMSO was 1:100), and the excess solvent was removed by rotary evaporation, and then vacuum 75 o C and dried for 12 h to obtain the conductive adhesive product.

[0046] The concrete operation of preparing lithium-ion battery is as follows:

[0047] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95 nanometer silicon, add it to the binder solution, and stir for 24 h to make the slurry even...

Embodiment 2

[0053] The specific operation method of preparing conductive adhesive is as follows:

[0054] Add 0.553g (3mmol) 4,4'-diaminobiphenyl and 1.261g (6mmol) 4,4-biphenyldicarbaldehyde into a three-necked flask, add 10ml of DMSO as a solvent, and stir evenly with magnetic force;

[0055] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 60°C, and react for 12 hours to obtain a conductive polyimide binder solution.

[0056] Dialyze 3 times with DMSO (the volume ratio of binder solution to DMSO is 1:100), rotary evaporate to remove excess solvent, and then vacuum 75 o C and dried for 12 h to obtain the conductive polymer binder.

[0057] The concrete operation of preparing lithium-ion battery is as follows:

[0058] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95g of nano-silicon, add it into the binder solution, and stir for 24 hours to make the slurry evenly mixed.

[0059] The obtained negativ...

Embodiment 3

[0064] The specific operation method of preparing conductive adhesive is as follows:

[0065] Add 0.276g (1.5mmol) 4,4'-diaminobiphenyl, 0.324g (1.5mmol) 3,3-dihydroxybenzidine and 0.631g (3mmol) 4,4-biphenyldicarbaldehyde into the three-necked flask, Add 10ml of DMSO as a solvent and stir evenly with magnetic force;

[0066] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 100°C, and react for 12 hours to obtain a conductive polyimide binder solution.

[0067] Dialyze 3 times with DMSO, remove excess solvent by rotary evaporation, and then vacuum 75 o C and dried for 12 h to obtain the conductive polymer binder.

[0068] The concrete operation of preparing lithium-ion battery is as follows:

[0069] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95 of the silicon-carbon composite negative electrode material, add it into the binder solution, and stir for 24 h to make the slurry evenly mixed...

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Abstract

The invention relates to a polyimide conductive adhesive used for a silicon-based negative electrode of a lithium ion secondary battery. Conductive polymer made by copolymerization of monomer A and monomer B, wherein monomer A is 1,5-naphthalene diamine, 4,4'-diaminobiphenyl or 3,3-dihydroxybenzidine One of them and its mixture; monomer B is one of naphthalene-2,3 dicarbaldehyde, 4,4-biphenyldicarbaldehyde or 6-hydroxyl-2-naphthaldehyde and its mixture; infrared spectrum test, in 1645 (±5) cm ‑1 There are characteristic absorption peaks of imine groups on the left and right. The present invention can completely abandon the use of traditional conductive agents, and greatly increase the loading capacity of active substances in electrodes; form rich cross-linked networks through rich hydrogen bonds and physical cross-links contained in molecular chains, and inhibit the volume expansion of silicon-based materials, Stabilize the electrode structure. It is especially suitable for silicon-based negative electrodes of lithium-ion secondary batteries. The electrode of the invention has the characteristics of good rate performance, high cycle stability, long cycle life, simple preparation process, suitable for industrial production and the like.

Description

technical field [0001] The invention relates to a polyimide conductive adhesive used for a silicon-based negative electrode of a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries are widely used in transportation, energy storage, and 3C digital fields due to their high energy density, long cycle life, and low self-discharge rate. The anode material of commercialized lithium-ion secondary batteries is still dominated by graphite. However, its low theoretical specific capacity (372mAh / g) is difficult to continue to meet people's demand for high-performance secondary batteries. [0003] Silicon-based anode material is considered to be a very promising carbon replacement material due to its high specific capacity (3579 mAh / g) and abundant natural reserves. However, silicon will produce a large volume expansion during repeated charge and discharge, resulting in the separation of electrode materials, conductive agents and current collec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/058C08G12/08
CPCH01M4/622H01M10/0525H01M10/058C08G12/08Y02E60/10Y02P70/50
Inventor 杨化滨高世伦潘宜漾
Owner NANKAI UNIV
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