Preparation and application of lithium polymethylallyl sulfonate for lithium battery negative electrode protection

A technology of lithium polymethacrylate sulfonate and lithium methacrylate sulfonate, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as shortage, reduce the loss of active substances, improve cycle performance, prevent effect of growth

Active Publication Date: 2021-10-01
HANGZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the problem of lack of excellent lithium battery negative electrode protective layer in the existing lithium battery, and provides the preparation and application of a lithium battery negative electrode protective layer polymethyl propylene sulfonate lithium, which is spin-coated with poly Lithium methacrylate functional protective layer (PP-SO 3 Li), which can effectively improve the cycle performance of lithium batteries, reduce the loss of active materials caused by the corrosion reaction between electrochemical reaction products and lithium metal negative electrodes, prevent the growth of lithium dendrites, improve the cycle performance of lithium batteries and prolong their service life

Method used

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  • Preparation and application of lithium polymethylallyl sulfonate for lithium battery negative electrode protection
  • Preparation and application of lithium polymethylallyl sulfonate for lithium battery negative electrode protection
  • Preparation and application of lithium polymethylallyl sulfonate for lithium battery negative electrode protection

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preparation example Construction

[0046] The preparation process of described solid catalyst is:

[0047] a. Under the protection of argon, add anhydrous magnesium chloride, n-heptane and n-butanol to the container, raise the temperature to 85-90°C, stir for 3-3.2h, then cool down to 58-60°C and then add carbon dioxide Silicon, continue to stir and react for 2.8-3.2h. After the reaction is completed, the solid is collected by suction filtration to obtain MgCl 2 / SiO 2 Composite carrier; the addition ratio between anhydrous magnesium chloride, n-heptane, n-butanol and silicon dioxide is 1-1.2mol: 4.5-5.5mL: 3.8-4mol: 0.78-0.82mol;

[0048] b. Under argon protection, add MgCl to the container 2 / SiO 2 Composite carrier, titanium tetrachloride and n-heptane, react at 86-90°C for 1.8-2h, after the reaction is completed, filter while hot, wash with n-hexane, and dry to obtain a solid catalyst; MgCl 2 / SiO 2 Composite carrier, titanium tetrachloride and n-heptane 4.8-5mol: 4.6-5.2mol: 48-50mL.

[0049] The app...

Embodiment 1

[0052] A kind of preparation of lithium battery negative electrode protection polymethyl propylene sulfonate lithium, comprises following preparation steps:

[0053] (1) Dissolve methylpropenesulfonic acid in water, add 2.2M lithium hydroxide aqueous solution under ice bath and nitrogen conditions, the molar weight of lithium hydroxide is 2.5 times of methylpropenesulfonic acid molar weight, and react under normal temperature After 23 hours, after the reaction was completed, 1.1M dilute hydrochloric acid was added to the reaction liquid until solids were precipitated, and after being fully stirred, filtered, and the solids were collected to obtain lithium methacrylate;

[0054] (2) Heat lithium methacrylate, triethylaluminum and solid catalyst synthesized in step (1) to 60°C for 23.8 hours, add acidified ethanol to terminate the reaction, filter, and dry to obtain lithium polymethacrylate sulfonate ; The molar ratio of triethylaluminum to the solid catalyst is 240:1.1, the mol...

Embodiment 2

[0064] A kind of preparation of lithium battery negative electrode protection polymethyl propylene sulfonate lithium, comprises following preparation steps:

[0065] (1) Dissolve methylpropenesulfonic acid in water, under ice bath and nitrogen conditions, add 2M lithium hydroxide aqueous solution, the molar weight of lithium hydroxide is 1.2 times of methylpropenesulfonic acid molar weight, react at room temperature for 22h , after the reaction is completed, add 1M dilute hydrochloric acid to the reaction solution until solids are precipitated, after fully stirring, filter, collect the solids to obtain lithium methene sulfonate;

[0066] (2) Heat lithium methacrylate, triethylaluminum and solid catalyst synthesized in step (1) to 58°C for 23.5 hours, add acidified ethanol to terminate the reaction, filter, and dry to obtain lithium polymethacrylate sulfonate ; The molar ratio of triethylaluminum to the solid catalyst is 240:1, the molar weight of the solid catalyst is 5% of th...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses preparation and application of a lithium battery negative electrode protective layer lithium polymethylallyl sulfonate aiming at the problem that an existing lithium battery is lack of an excellent lithium battery negative electrode protective layer, and the preparation method comprises the following steps: (1) dissolving methallyl sulfonic acid in water, adding a lithium hydroxide aqueous solution for reaction under the conditions of ice bath and nitrogen, after the reaction is finished, adding diluted hydrochloric acid until a solid is separated out, fully conducting stirring, conducting filtering, and collecting the solid to obtain lithium methallyl sulfonate; and (2) carrying out heating reaction on lithium methallyl sulfonate, triethyl aluminum and a solid catalyst, adding acidified ethanol to terminate the reaction, conducting filtering, and conducting drying to obtain the lithium polymethallyl sulfonate. The lithium negative electrode is spin-coated with a lithium polymethallyl sulfonate functional protection layer, so that the cycle performance of the lithium battery is effectively improved, the loss of active substances caused by corrosion reaction of electrochemical reaction products and the lithium metal negative electrode is reduced, the growth of lithium dendrites is prevented, the cycle performance of the lithium battery is improved, and the service life of the lithium battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to the preparation and application of lithium polymethylpropylene sulfonate, a negative electrode protective layer of lithium batteries. Background technique [0002] With the lightening of portable electronic devices with diverse functions such as camcorder recorders, mobile phones and notebook computers, research on driving power is increasing, and lithium-ion batteries play an important role in energy storage devices. Lithium is the metal with the smallest mass and lowest potential among all simple substances, and its theoretical specific capacity is as high as 3860mAh / g. Lithium batteries composed of lithium have the characteristics of high working voltage, high mass specific capacity and large specific energy. Lithium batteries using lithium as the negative electrode will generate lithium dendrites and safety problems. In the early 1990s, Sony Corporation of Japan used lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F128/02H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCC08F128/02H01M4/628H01M4/1395H01M4/134H01M4/382H01M10/0525H01M2004/027Y02E60/10
Inventor 赵宇李华梅祝英忠叶婧
Owner HANGZHOU NORMAL UNIVERSITY
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