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High-temperature-storage-resistant oil-based lithium ion battery diaphragm and preparation method thereof

A high temperature resistant and diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as capacity reduction and active material loss

Pending Publication Date: 2022-02-01
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the battery is left standing, its capacity will decrease slightly. The reason is that the electrolyte reacts on the electrode surface or with other substances during the high temperature standing process, resulting in the loss of active materials.

Method used

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  • High-temperature-storage-resistant oil-based lithium ion battery diaphragm and preparation method thereof
  • High-temperature-storage-resistant oil-based lithium ion battery diaphragm and preparation method thereof
  • High-temperature-storage-resistant oil-based lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a high-temperature-resistant storage diaphragm slurry, comprising: putting an organic solvent and PVDF into a stirring tank, stirring at a speed of 1450 rpm for 80 minutes, adding a water removal additive, stirring at a speed of 1500 rpm for 35 minutes until uniform, adding high-temperature ingredients For the membrane agent, stir at a speed of 1500rpm for 50min until uniform, then add the optimizer, stir at a speed of 1500rpm for 30min until uniform, and obtain a high-temperature-resistant storage diaphragm slurry, wherein the organic solvent is DMAC, and the water-removing additive is alkyl phosphoric anhydride. The high-temperature film-forming agent is methylene disulfonate, and the optimizing agent is fluoroboric acid ester. The ratio of organic solvent, PVDF, water-removing additive, high-temperature film-forming agent and optimizing agent is 13:2 in parts by mass. :0.05:0.08:0.08.

Embodiment 2

[0027] A method for preparing a high-temperature-resistant storage diaphragm slurry, comprising: putting an organic solvent and PVDF into a stirring tank, stirring at a speed of 1550 rpm for 90 minutes, adding a water-removing additive, stirring at a speed of 1500 rpm for 40 minutes until uniform, adding high-temperature ingredients Membrane, stir at a speed of 1500rpm for 60min until uniform, then add the optimizer, stir at a speed of 1500rpm for 40min until uniform, and obtain a high-temperature storage diaphragm slurry, wherein the organic solvent is DMF, and the water-removing additive is alkyl phosphoric anhydride. The high-temperature film-forming agent is methylene disulfonate, and the optimizing agent is fluoroboric acid ester. The ratio of organic solvent, PVDF, water-removing additive, high-temperature film-forming agent and optimizing agent is 18:2.8 in parts by mass. :0.09:0.15:0.2.

Embodiment 3

[0029] A method for preparing a high-temperature-resistant storage diaphragm slurry, comprising: putting an organic solvent and PVDF into a stirring tank, stirring at a speed of 1650 rpm for 100 minutes, adding a water removal additive, stirring at a speed of 1500 rpm for 45 minutes until uniform, adding high-temperature ingredients The membrane agent was stirred at a speed of 1500rpm for 70min until uniform, then the optimizer was added and stirred at a speed of 1500rpm for 50min until uniform to obtain a high-temperature-resistant storage diaphragm slurry, wherein the organic solvent was DMAC, and the water-removing additive was alkyl phosphoric anhydride. The high-temperature film-forming agent is 4-methylethylene sulfite, and the optimizer is fluoroboric acid ester. The ratio of organic solvent, PVDF, water-removing additive, high-temperature film-former and optimizer is 22 in parts by mass. :3.2:0.12:0.23:0.3.

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Abstract

The invention discloses a high-temperature-storage-resistant oil-based lithium ion battery diaphragm and anpreparation method thereof. The preparation method comprises the following steps: uniformly stirring an organic solvent and PVDF (Polyvinylidene Fluoride), adding a water removal additive, uniformly stirring, adding a high-temperature film-forming agent, uniformly stirring, adding an optimizing agent, and uniformly stirring to obtain high-temperature-storage-resistant diaphragm slurry, the organic solvent being one or a mixture of more of DMAC, DMF and acetone, the dewatering additive being alkyl phosphoric anhydride, the high-temperature film-forming agent being methylene methanedisulfonate and / or 4-methyl ethylene sulfite, and the optimizing agent being fluoroborate. The method for preparing the oil-based lithium ion battery diaphragm comprises the following steps: coating one surface of a base membrane with the high-temperature-resistant storage diaphragm slurry, extracting and drying to obtain the oil-based lithium ion battery diaphragm. The high-temperature film-forming agent and the optimizing agent supplement each other, the dynamic stability of the SEI film is promoted, and the water removal effect of acid anhydride is matched, so that the super-strong high-temperature-resistant storage performance of the lithium battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a high-temperature-resistant storage oil-based lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] In the manufacturing process of lithium-ion batteries, after the formation and capacity separation processes are completed, high-temperature standing and aging processes are required. With the high-temperature standing process, the internal state of lithium-ion batteries will gradually become stable. Use to create favorable innate conditions. However, after the battery is left standing, its capacity will decrease slightly. The reason is that the electrolyte reacts on the electrode surface or with other substances during the high temperature standing process, resulting in the loss of active materials. How to reduce the capacity loss and the generation of side reactions during the static process of the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403
CPCH01M50/403Y02E60/10
Inventor 袁海朝徐锋豆赛赛苏碧海白涛胡晓梦李钦钦袁静
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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