Preparation method and application of lithium battery binder with self-repairing performance

A lithium battery and binder technology, which is applied in the direction of lithium batteries, secondary batteries, battery electrodes, etc., can solve the problems of electrode material structure damage, reduction of battery charge-discharge specific capacity, cycle stability, and poor high temperature resistance. , to achieve high discharge specific capacity, specific capacity and improved cycle stability, high cycle stability

Active Publication Date: 2020-11-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinylidene fluoride (PVDF) is the most important positive electrode binder for lithium batteries, but PVDF has its own shortcomings such as limited mechanical strength, poor high temperature resistance and easy swelling in the electrolyte, making it unable to effectively inhibit th

Method used

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  • Preparation method and application of lithium battery binder with self-repairing performance
  • Preparation method and application of lithium battery binder with self-repairing performance
  • Preparation method and application of lithium battery binder with self-repairing performance

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Experimental program
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Embodiment 1

[0038]The preparation and application of the lithium battery binder with self-repairing properties is characterized in that it comprises the following steps:

[0039] (1) Synthesis of dithiolactone-containing functional group component A: N,N'-oxalylthiolactone: Weigh 6.15g (40mmol) DL-homocysteine ​​thiolactone hydrochloride and dissolve it in 50mL In anhydrous dichloromethane, 11.1 mL of triethylamine was slowly added thereto, cooled to 0°C, and 1.70 mL (20 mmol) of oxalyl chloride was added dropwise to the solution. After the reaction system was stirred at room temperature for 2 hours, excess solvent was removed by rotary evaporation. The remaining solids were successively washed with 100 mL of 0.1 mol / L dilute hydrochloric acid and 300 mL of deionized water, and dried in vacuum. Finally, N,N'-oxalylthiolactone is obtained.

[0040] (2) Synthesis of a binder for lithium ions with self-healing properties: 100 mg of N,N'-oxalylthiolactone containing dithiolactone functional...

Embodiment 2

[0044] The preparation and application of the lithium battery binder with self-repairing properties is characterized in that it comprises the following steps:

[0045] (1) Synthesis of dithiolactone-containing functional group component AN, N'-sebacoyl thiolactone: Weigh 6.15g (40mmol) DL-homocysteine ​​thiolactone hydrochloride and add it to 13.44 g NaHCO 3 In a suspoemulsion of dioxane and water, the volume ratio of dioxane to water was 2:1 (120ml in total), and the mixture was stirred for 30 minutes. Then within 30 minutes, 4.27mL (20mmol) of sebacoyl chloride was added dropwise to the mixture, stirred overnight at room temperature, the resulting solid was suction filtered, washed with 200mL of deionized water, and filtered to obtain N,N'-sebacoyl sulfide Lactone.

[0046] (2) Synthesis of a binder for lithium ions with self-healing properties: 100 mg of N,N'-sebacoyl thiolactone containing dithiolactone functional groups and 200 mg of polyamino functional group-containin...

Embodiment 3

[0050] The preparation and application of the lithium battery binder with self-repairing properties is characterized in that it comprises the following steps:

[0051] (1) Synthesis of AN,N'-oxalylthiolactone containing dithiolactone functional group component: weigh 6.15g (40mmol) DL-homocysteine ​​thiolactone hydrochloride and dissolve in 50mL Slowly add 11.1 mL of triethylamine into dichloromethane water, and cool to 0° C., then gradually add 1.70 mL (20 mmol) of oxalyl chloride dropwise into the solution. After the reaction system was stirred at room temperature for 2 hours, excess solvent was removed by rotary evaporation. The remaining solids were successively washed with 100 mL of 0.1 mol / L dilute hydrochloric acid and 300 mL of deionized water, and dried in vacuum. Finally, N,N'-oxalylthiolactone is obtained.

[0052] (2) Synthesis of a binder for lithium ions with self-healing properties: 100 mg of N,N'-oxalylthiolactone containing dithiolactone functional groups an...

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Abstract

The invention relates to a preparation method and application of a lithium battery binder with self-repairing performance. The method comprises the following steps: adding a component A containing a disulfide lactone functional group and a component B containing an amino functional group into a solvent, and reacting at 50-100 DEG C for 12 hours to obtain the polymer binder with self-repairing performance for the lithium battery, wherein the component A containing the sulfur lactone functional group is N,N'-oxalyl sultone, N,N'-malonyl sultone, N,N'-butanedioyl sultone, N,N'-glutaryl sultone, N,N'-adipoyl sultone or N,N'-sebacoyl sultone; and the component B containing the amino functional group is polyethyleneimine, chitosan, amino cellulose or polylysine. The polymer binder disclosed by the invention can enable the positive electrode of the lithium battery to have a self-repairing characteristic, so that the problem of pulverization of an electrode material is greatly improved, and the specific discharge capacity and the cycling stability of the lithium battery are favorably improved.

Description

Technical field: [0001] The invention belongs to the field of lithium battery binders. Specifically relates to the preparation and application of a lithium battery binder with self-repairing properties. Background technique: [0002] In recent years, human's demand and consumption of energy have been increasing day by day. As a clean and efficient energy storage and conversion device, the new green and high-performance secondary battery has become one of the fields that countries in the world are competing to develop. Among them, the development of lithium batteries has attracted much attention. focus on. Lithium batteries have the advantages of high voltage, high energy density, long cycle life, and small internal resistance (Nature, 2001, 414, 359-367). Lithium batteries include lithium-ion batteries and lithium-sulfur batteries, among which lithium-ion batteries have developed into one of the most widely used commercial batteries; The larger theoretical specific capaci...

Claims

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Application Information

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IPC IPC(8): C08G73/04H01M4/62H01M10/052H01M10/0525
CPCC08G73/02H01M4/622H01M10/052H01M10/0525Y02E60/10
Inventor 张效洁吉海峰姜晓霞孙淼瞿雄伟
Owner HEBEI UNIV OF TECH
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