Multifunctional self-repairing adhesive for lithium-sulfur battery positive electrode, preparation method and application thereof

A lithium-sulfur battery, multi-functional technology, applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of limited ability to adsorb polysulfide compounds, poor toughness of polyacrylic acid, etc., to protect the integrity of the interface and ensure the conductive path , the effect of excellent cycle stability

Active Publication Date: 2021-04-13
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the defects or deficiencies of polyacrylic acid in the prior art, such as poor toughness, limited ability to adsorb polysulfide compounds, and the difficulty of efficiently solving the serious volume expansion and shuttle effect of the sulfur positive electrode, the present invention provides a lithium-sulfur battery positive electrode. Multifunctional self-healing adhesive

Method used

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  • Multifunctional self-repairing adhesive for lithium-sulfur battery positive electrode, preparation method and application thereof
  • Multifunctional self-repairing adhesive for lithium-sulfur battery positive electrode, preparation method and application thereof
  • Multifunctional self-repairing adhesive for lithium-sulfur battery positive electrode, preparation method and application thereof

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preparation example Construction

[0069] Preparation of Sulfur / Carbon Black Composite: Sulfur Loading of Commercial Super p Carbon Materials Using In Situ Generation. The specific operation is: put 3.0g of Na 2 S 2 o 3 ·5H 2 O and 0.15g of Super p carbon material were placed in a 50mL round-bottomed flask, and 10mL of deionized water was added, stirred for 10min until uniform and ready for use. Measure the concentrated hydrochloric acid (38wt%) of 2.37g again, after adding 23.7g deionized water and fully mixing, dilute hydrochloric acid is slowly dripped in the above-mentioned round bottom flask, after stirring and reacting for 12h, the reaction system is carried out suction filtration, washing to The filtrate was neutral, and the product was dried in a blast oven at 60°C, and then dried for use.

[0070] Polyrotaxane is a polymer material prepared by α-cyclodextrin and polyethylene glycol through supramolecular self-assembly-capping method. The cationic polyrotaxane is a polymer material obtained by reac...

Embodiment 1

[0072] The preparation of embodiment 1 phenylboronic acid graft polyacrylic acid

[0073] Weigh 1.0g of dried polyacrylic acid (number average molecular weight 400kDa) and add it to 20mL of dimethylformamide (DMF). After stirring to obtain a clear solution, add 5mL of DMF solution containing 0.06g of N,N-dicarbonylimidazole , stirred and reacted at 50°C in an argon atmosphere for 12h, cooled to 30°C and added 0.086g of 3-aminophenylboronic acid, kept the temperature for 48h, concentrated and dripped into excess tetrahydrofuran (THF) for precipitation, separated by Vacuum drying to obtain phenylboronic acid grafted polyacrylic acid. Infrared spectrogram see attached figure 1 , where at 1540cm -1 and 1450cm -1 The absorption peak that appears comes from the skeleton vibration of C=C in the benzene ring, at 911cm -1 The C-H out-of-plane bending vibration signal in the benzene ring structure appeared at , indicating the successful preparation of phenylboronic acid grafted poly...

Embodiment 2

[0074] The preparation of embodiment 2 phenylboronic acid graft polyacrylic acid

[0075] Weigh 1.0g of dried polyacrylic acid (number average molecular weight 400kDa) and add it to 20mL of dimethylformamide (DMF). After stirring to obtain a clear solution, add 5mL of DMF solution containing 0.3g of N,N-dicarbonylimidazole , stirred and reacted at 50°C in an argon atmosphere for 12h, cooled to 30°C and added 0.086g of 3-aminophenylboronic acid, kept the temperature for 48h, concentrated and dripped into excess tetrahydrofuran (THF) for precipitation, separated by Vacuum drying to obtain phenylboronic acid grafted polyacrylic acid. In this embodiment, the grafting rate of phenylboronic acid grafted polyacrylic acid is 13.3%.

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Abstract

The invention discloses a multifunctional self-repairing adhesive for a positive electrode of a lithium-sulfur battery, a preparation method and application thereof. The multifunctional self-repairing adhesive for the positive electrode of the lithium-sulfur battery is prepared from phenylboronic acid grafted polyacrylic acid, thioglycerol grafted polyrotaxane and thioglycerol grafted cationic polyrotaxane. According to the invention, the self-repairing adhesive provided by the invention has good adhesion and toughness, and can buffer the volume change of the positive electrode of the lithium-sulfur battery in the charging and discharging process; the binder has self-repairability, can autonomously repair cracks or micro-damage generated in the charge-discharge cycle process of the positive electrode, and ensures good interface contact between the active substance and the conductive agent and the integrity of a conductive path; the cross-linked network contains rich hydroxyl, carboxyl and quaternary ammonium salt cationic groups, and can adsorb polysulfide and limit the polysulfide near the positive electrode, thereby effectively inhibiting the shuttle effect; and the sulfur positive electrode material prepared from the binder has excellent charge-discharge specific capacity and cycling stability.

Description

technical field [0001] The invention relates to the technical field of secondary battery materials, in particular to a multifunctional self-repairing binder for positive electrodes of lithium-sulfur batteries and its preparation method and application. Background technique [0002] With the increasingly serious problems of energy crisis and environmental pollution, people's demand for green new energy battery systems is increasing. Lithium-sulfur batteries have attracted extensive attention because of their low cost of active materials, high theoretical specific capacity (1675mAh / g) and energy density (~2600Wh / kg). However, there are still many problems to be solved to realize the commercial application of lithium-sulfur batteries, mainly including: ① the low conductivity of sulfur and sulfide in the sulfur cathode material, which makes the redox reaction rate inside the battery low; ② the active material in the sulfur cathode and the discharge The density difference betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139H01M4/02H01M10/052
CPCH01M4/622H01M4/139H01M2004/028H01M10/052Y02E60/10
Inventor 容敏智谢振华章明秋
Owner SUN YAT SEN UNIV
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