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A kind of lithium battery separator based on biomass furan-based polymer and preparation method thereof

A lithium battery diaphragm and polymer technology, applied in the direction of lithium batteries, non-aqueous electrolyte batteries, battery components, etc., can solve the problems of demanding molecular weight of aramid fiber, poor electrolyte wettability, high cost of coating process, etc., to achieve Good thermal stability and electrolyte wettability, improved rate performance and cycle stability, improved convenience and stability

Active Publication Date: 2022-08-02
合肥利夫生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyolefin separator has poor wettability to the electrolyte, so the mobility of lithium ions is low, and the electrochemical performance of the lithium battery is poor; at the same time, due to the inherent low melting point of the polyolefin separator, its thermal stability is poor, and the temperature above 90 ° C Heat shrinkage will occur, and it will gradually melt above 150°C; when it is applied to high-power lithium batteries, the temperature rises during operation, which may cause the polyolefin diaphragm to shrink rapidly, causing internal short circuits or even explosions in the batteries
The solubility of aramid fibers is poor, and the molecular weight of aramid fibers is strictly required during processing. The molecular weight is too large, it is difficult to coat, the molecular weight is too small, the heat resistance is poor, and the strength is low.
Moreover, the process of dissolving aramid fiber consumes time and electricity, resulting in high cost of the coating process
Traditional aramid fibers are non-degradable and cause environmental pollution
The ceramic diaphragm is used for a long time, and the coating is easy to fall off

Method used

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  • A kind of lithium battery separator based on biomass furan-based polymer and preparation method thereof
  • A kind of lithium battery separator based on biomass furan-based polymer and preparation method thereof
  • A kind of lithium battery separator based on biomass furan-based polymer and preparation method thereof

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Effect test

preparation example Construction

[0042] Preparation of polymer A: add solvent N,N-dimethylacetamide 10L, 2,5 furandiformyl chloride 192g, 4,4'-diaminodiphenyl ether 200g sequentially at 25°C, and react for 5h , the solvent was evaporated to dryness under reduced pressure to obtain polymer A.

[0043] Preparation of polymer B: Add solvent N,N-dimethylacetamide 10L, 2,5-furandiformyl chloride 192g, p-phenylenediamine 108g in sequence to the polymerization reaction kettle at 25°C, react for 5h, evaporate to dryness under reduced pressure solvent to obtain polymer B.

[0044] Preparation of polymer C: 10L of solvent N,N-dimethylacetamide, 192g of 2,5-furandiformyl chloride, 108g of m-phenylenediamine were added to the polymerization reaction kettle in turn at 25°C, reacted for 5h, and evaporated to dryness under reduced pressure solvent to give polymer C.

Embodiment 1

[0046] Add 3kg of biomass furan-based polymer A powder to 100kg of N,N-dimethylacetamide with a purity greater than 99%, stir for 30min to completely dissolve, and then add 90g of polyethylene oxide with an average molecular weight of 500,000, 3kg of silicon oxide and 3kg of n-octane were used to prepare biomass furan-based polymer A coating slurry, and the reaction was carried out under the protection of nitrogen. The coating slurry was coated with 0.1% SiO 2 On the PP blend film, immersed in water for 60 min, and dried at 80 °C to form a film.

Embodiment 2

[0048]Add 3kg of biomass furan-based polymer B powder to 100kg of N-methyl-2-pyrrolidone with a purity greater than 99%, stir for 30min to completely dissolve, then add 60g of polyvinyl alcohol with an average molecular weight of 2000, 1kg of oxidized Titanium, 3kg isopropanol, to prepare biomass furan-based polymer B coating slurry, the reaction is carried out under the protection of nitrogen. The coating slurry was coated with 0.1% SiO 2 On the PP blend film, immersed in water for 30 min, and dried at 100 °C to form a film.

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Abstract

The invention discloses a lithium battery separator based on biomass furan-based polymer and a preparation method thereof, and relates to the technical field of battery separators. There will be no obvious decomposition and carbonization at ℃, which can improve the safety of lithium batteries, especially suitable for lithium ion batteries used in electric vehicles. During the working process of electric vehicles, the diaphragm can withstand higher temperatures, greatly improving safety. The convenience and stability of the vehicle are also improved accordingly; and the biomass furan-based polymer of the structure described in the present invention has a low price, a wide range of sources, and a large market advantage.

Description

Technical field: [0001] The invention relates to the technical field of battery separators, in particular to a biomass furan-based polymer-based lithium battery separator and a preparation method thereof. Background technique: [0002] With the increasingly serious energy crisis and environmental pollution problems, the demand for renewable energy is increasing rapidly. Battery energy storage is the key to the development of renewable energy, especially lithium batteries, which have been widely used in electric vehicles, aerospace, portable electronic devices and other fields due to their high energy density, no memory effect, and environmental friendliness. The separator is an important part of lithium batteries, located between the positive and negative electrodes, preventing internal short circuits by avoiding electrode contact. At the same time, the separator can store a sufficient amount of electrolyte to ensure the free and high-speed transmission of lithium ions. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/411H01M50/414H01M50/449H01M10/052
CPCH01M10/052Y02E60/10
Inventor 徐海柯卓李锋徐强周业欣徐康
Owner 合肥利夫生物科技有限公司
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