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Cellulose inorganic composite membrane, high-temperature-resistant battery diaphragm as well as preparation method and application of high-temperature-resistant battery diaphragm

An inorganic composite membrane and battery separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting battery cycle life and safety performance, battery rate performance, poor thermal stability of separators, affecting battery safety performance, etc. , to achieve the effect of favorable wetting and ion migration, excellent physical and electrochemical properties, and improved long-term shelving performance

Pending Publication Date: 2022-03-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, separators such as polypropylene (PP) and polyethylene (PE) based on polymer polyolefins have several problems, such as poor battery rate performance and thermal stability of the separator, which affect the cycle life and safety performance of the battery.
In the production process, this type of polyolefin battery separator is prone to breakage during the winding process, and it is easy to shrink when exposed to high temperature, so the baking temperature before battery injection should not be too high. Once it is too high, the separator will be seriously damaged. The shrinkage causes the battery to short circuit and affects the safety performance of the battery
[0004] In recent years, the scientific community has been trying to develop a battery separator that can overcome the low thermal stability and poor rate performance of commercial separators.

Method used

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  • Cellulose inorganic composite membrane, high-temperature-resistant battery diaphragm as well as preparation method and application of high-temperature-resistant battery diaphragm
  • Cellulose inorganic composite membrane, high-temperature-resistant battery diaphragm as well as preparation method and application of high-temperature-resistant battery diaphragm
  • Cellulose inorganic composite membrane, high-temperature-resistant battery diaphragm as well as preparation method and application of high-temperature-resistant battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a method for preparing a filling powder material for a high-temperature-resistant battery separator, wherein the preparation method includes the following steps:

[0054] Weigh 1g sodium alginate and add it to 100mL deionized water, stir and dissolve to a clear solution;

[0055] Weigh 2g of diatomaceous earth, dry in vacuum at 120°C for 12 hours, and then cool down naturally;

[0056] Add the dried diatomaceous earth to the above-mentioned sodium alginate solution, stir for 12 hours, and filter with suction;

[0057] The above powder was vacuum dried at 120° C. for 12 hours, and then ground to obtain a filling powder material for a high temperature resistant battery diaphragm.

Embodiment 2

[0059] This embodiment provides a method for preparing a filling powder material for a high-temperature-resistant battery separator, wherein the preparation method includes the following steps:

[0060] Weigh 2g sodium alginate and add it to 100mL deionized water, stir and dissolve to a clear solution;

[0061] Weigh 2g of diatomaceous earth, dry in vacuum at 120°C for 12 hours, and then cool down naturally;

[0062] Add the dried diatomaceous earth to the above-mentioned sodium alginate solution, stir for 12 hours, and filter with suction;

[0063] The above powder was vacuum dried at 120° C. for 12 hours, and then ground to obtain a filling powder material for a high temperature resistant battery diaphragm.

Embodiment 3

[0065] This embodiment provides a method for preparing bacterial cellulose fibers for a high-temperature-resistant battery separator, wherein the preparation method includes the following steps:

[0066] Shred the bacterial cellulose taken out of the refrigerator, put it into 400 mL of water and ethanol with a volume ratio of 1:1 for cleaning, stir for 24 hours, and change the mixed solution every 8 hours for 3 times.

[0067] Put the above-mentioned cleaned bacterial cellulose into a 500mL round bottom flask filled with 300mL1mol / L sodium hydroxide solution, purify it in an oil bath at 60°C for 6 hours, and then mix it with water and ethanol at a volume ratio of 1:1. The solution was washed to neutral.

[0068] Continue to put the above-mentioned neutral bacterial cellulose into 400 mL of water and ethanol with a volume ratio of 1:1 for cleaning, stir for 24 hours, and change the mixed solution every 8 hours for 3 times.

[0069] The above-mentioned bacterial cellulose was c...

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Abstract

The invention provides a cellulose inorganic composite membrane, a high-temperature-resistant battery diaphragm as well as a preparation method and application of the high-temperature-resistant battery diaphragm, and belongs to the field of lithium ion battery manufacturing. The cellulose inorganic composite membrane comprises bacterial cellulose and composite powder. The composite powder comprises an organic high-molecular compound and an inorganic substance; the mass ratio of the bacterial cellulose to the composite powder is (5-50): (25-200); the mass ratio of the organic high-molecular compound to the inorganic matter is (10-300): (100-300). The preparation method of the battery diaphragm is simple, pollution-free in process and low in commercialization cost. The battery diaphragm is high in porosity and liquid absorption rate, and electrolyte infiltration and ion migration are facilitated; the thermal stability is excellent, so that the safety performance of the lithium ion battery is greatly improved; and when being applied to the lithium ion battery diaphragm, the lithium ion battery diaphragm shows better long cycle performance and rate cycle performance, and is a lithium ion battery diaphragm with great potential.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a cellulose inorganic composite membrane, a lithium-ion battery diaphragm, a preparation method and application thereof. Background technique [0002] With the vigorous development of electric vehicles and energy storage industries, the research and development of lithium-ion and batteries with large capacity, long life, high safety and fast charging have attracted widespread attention. Lithium-ion batteries have the characteristics of high energy density, long cycle life, and no memory effect; they also have the advantages of safety, environmental friendliness, reliability, and fast charge and discharge, so they have become a hot spot in technology research in recent years. [0003] The battery separator is an important part of the lithium-ion battery. It not only provides an ion transmission channel for the liquid battery, but also prevents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/44H01M50/446H01M50/403H01M50/489H01M50/491H01M10/0525
CPCH01M50/44H01M50/446H01M50/403H01M50/489H01M50/491H01M10/0525Y02E60/10
Inventor 何海勇郭泽浩
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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