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A preparation method and application of a lithium battery binder with self-healing properties

A lithium battery and binder technology, applied in the field of lithium battery binder preparation, can solve the problems of electrode material structure damage, poor high temperature resistance, limited mechanical strength, etc., and achieve high discharge specific capacity and high cycle stability Effect

Active Publication Date: 2022-03-29
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 the charging and discharging process. The volume change of the electrode material leads to the destruction of the structure of the electrode material, which reduces the charge-discharge specific capacity and cycle stability of the battery (Journal of Energy Chemistry, 2020, 43, 165-172)

Method used

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  • A preparation method and application of a lithium battery binder with self-healing properties
  • A preparation method and application of a lithium battery binder with self-healing properties
  • A preparation method and application of a lithium battery binder with self-healing properties

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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 component A containing dithiolactone functional group and component B containing amino functional group into a solvent, and reacting at 50-100° C. for 12 hours to obtain a lithium battery polymer with self-repairing performance material binder; the component A of the sulfur-containing lactone functional group is N,N'-oxalylthiolactone, N,N'-malonylthiolactone, N,N'-succinylthiolactone lactone, N,N'-glutaryl thiolactone, N,N'-adipyl thiolactone or N,N'-sebacoyl thiolactone; the amino functional group-containing component B is Polyethyleneimine, chitosan, aminocellulose or polylysine. The polymer binder of the present invention can make the positive electrode of the lithium battery have the characteristic of self-repairing, thereby greatly improving the powdering problem of the electrode material, and is beneficial to improving the discharge specific capacity and cycle stability of the lithium battery.

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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Patent Type & Authority Patents(China)
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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