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Diaphragm and battery containing diaphragm

A diaphragm and battery technology, applied in the fields of diaphragm and its preparation method, batteries containing the diaphragm, and diaphragm modification layer, can solve the problems of reducing the ductility of the diaphragm, increasing the weight and thickness of the diaphragm, and achieving weight reduction, increased absorption speed, The effect of increasing the wetting angle

Pending Publication Date: 2022-02-25
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method not only reduces the ductility of the separator, but also increases the weight and thickness of the separator

Method used

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preparation example Construction

[0036] The present invention also provides a method of preparing the diaphragm modifier, comprising the steps of:

[0037] a) Prepare solutions containing the peptide material;

[0038] b) The solution was applied to at least one side surface of the diaphragm substrate to obtain a modifying layer obtained by obtaining the diaphragm.

[0039] The present invention also provides the preparation method of the diaphragm comprising the steps of:

[0040] 1) Prepare solutions containing the peptide material;

[0041] 2) The solution was applied to at least one side surface of the diaphragm substrate to prepare the separator.

[0042] According to the present invention, the step a) or step 1) specifically: dissolves the peptide material into the solvent to obtain a solution containing the peptide material.

[0043] In accordance with the present invention, in step b) or step 2), the coating can be spin coated or scraped.

[0044] In accordance with the present invention, in step b) or st...

Embodiment 1

[0053] Preparation of peptide material coating diaphragm:

[0054] S1: 0.1 mmol oligopeptide-6 (palmitum oligide) was added to 5 ml of 0.01 M NaOH aqueous solution, and then the pH of about 7 was adjusted with concentrated hydrochloric acid to obtain an oligopeptide solution;

[0055] S2: The oligopeptide solution obtained by step S1 is uniformly coated with a spin coated manner to a substrate material as a diaphragm (15 μm) of polypropylene, and then 60 ° C for vacuum drying 12h;

[0056] S3: washed with deionized water, and then dried at 60 ° C for 12 h at 60 ° C to give a polypropylene separator having an oligopeptide coating (2 μm thickness).

[0057] Preparation of positive electrode sheet: Polyacrylic acid (PAA) and PEO are dissolved in a acetonitrile solution in the mass of 1: 4, and the PVDF is a binder, and the positive electrode active material is added to the electrode active material. Get the positive slurry. In the mixture, the solid component contains 86 wt.% Cobalta...

Embodiment 2

[0060] Preparation of peptide material coating diaphragms:

[0061] In the present embodiment, the two-step-derived polypeptide material is selected by the end-based, and the preparation method is as follows:

[0062] S1: dissolved 10, 12-twenty-fifty-fifty-fifty-carbon acid (0.24 mmol) into 20 mL DMF, add O-benzotriazole-N, N, N ', N'-tetramethylurea tetrafluoroboric acid (TBTU) (0.24 mmol) and N, N-diisopropylamine (DIEA) (0.24 mmol), then electromagnetic stirring for 30 minutes to activate carboxyl groups. 0.20 mmol gagagag was dissolved in 10 ml of DMF, and the solution was added dropwise to the above mixing liquid, and the ice water bath was stirred for 3 h, then the excess DMF was removed. The remaining solid was dissolved in 10 mL of 0.1 M NaOH, and then precipitated with concentrated hydrochloric acid, then washed with deionized water. The above dissolved precipitated washing process was repeated multiple times, and then the dried dried to obtain a powder sample C. 25 -Gag...

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Abstract

The invention discloses a diaphragm and a battery containing the diaphragm. The diaphragm comprises a diaphragm substrate and a modification layer modified on at least one side surface of the diaphragm substrate, and the modification layer comprises a peptide material. According to the diaphragm, a binder is not needed for coating bonding, the weight of the diaphragm is reduced, meanwhile, after a conventional inorganic ceramic substrate is replaced with an organic material, the ductility and flexibility of the diaphragm substrate material are not reduced, and the performance of the diaphragm substrate material is improved. According to the diaphragm containing the modification layer, the cycle performance of the lithium metal battery can be effectively improved, the lithium metal battery has a good and stable charging and discharging process, the performance is excellent under the high current density, an obvious effect on inhibition of lithium dendrites is achieved, and commercialization of the lithium metal battery is facilitated.

Description

Technical field [0001] The present invention relates to the field of battery technology involving a membrane and a battery containing the diaphragm, and more particularly to a diaphragm modifying layer, a diaphragm, and a preparation method thereof, and a battery containing the diaphragm. Background technique [0002] The lithium-ion battery has the advantages of high energy density, long cycle life, no memory effect, and green environmental protection, and is therefore widely used in digital electronics, power and energy storage. The lithium-ion battery is mainly composed of a positive electrode, an anode, a diaphragm, and an electrolyte. The diaphragm is one of the most critical inner-layer components in the lithium ion battery structure. The main function is to prevent the battery short circuit, while ensuring the normal passage of the charge and discharge to ensure the normal operation of the battery. Therefore, the performance of the diaphragm directly affects the capacity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/411H01M50/449
CPCH01M50/40H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 董德锐赵伟张赵帅李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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