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Bio-based lithium battery diaphragm and preparation method thereof
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A lithium battery separator and polymer technology, applied in the direction of lithium batteries, secondary batteries, battery pack components, etc., can solve the problems of non-degradable aramid fibers, environmental pollution, etc., and achieve the goals of improving safety, avoiding short circuits, and preventing short circuits Effect
Active Publication Date: 2021-07-16
UNIV OF SCI & TECH OF CHINA
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Traditional aramid fibers are non-degradable and cause environmental pollution
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[0023] The invention discloses a preparation method of a furan-based polymer coating liquid, comprising:
[0024] Under an inertatmosphere, add 2,5-furandicarboxylic acid chloride to an organic solvent containing p-phenylenediamine and raise the temperature to 35-45°C, adjust the pH, and form the first solution after polymerization; add ceramics to the first solution The particles are mixed and stirred to form a second solution;
[0026] In some embodiments of the present invention, add 2,5-furandicarboxylic acid chloride to an organic solvent containing p-phenylenediamine and raise the temperature to 35-45°C, for example, 35°C, 36°C, 37°C, 38°C , 39°C, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C.
[0027] In some embodiments of the present invention, the mass ratio of organic solvent to p-phenylenediamine in the organic solvent containing p-phenylenediamine is 1: (5 t...
Embodiment 1
[0052] The preparation method of the furan-based polymer coating liquid of the present embodiment comprises the following steps:
[0053] Under the protection of an inert gas, add 500g of dimethylacetamide and 54g of p-phenylenediamine in turn, stir and cool down to 0-10°C, then add 96g of 2,5-furandicarboxylic acid chloride, stir for 1 hour, and then heat up to 40-45°C, add 24g of lithium hydroxide, stir, add 25g of aluminum oxide, and stir to obtain the first mixed solution. N,N-dimethylacetamide is added to mix and stir with the first mixed solution to obtain a furyl polymer compound coating solution.
Embodiment 2
[0055]The preparation method of the furan-based polymer coating liquid of the present embodiment comprises the following steps:
[0056] Under the protection of an inert gas, add 500g of dimethylacetamide and 54g of p-phenylenediamine in turn, stir and cool down to 0-10°C, then add 116g of 2,5-furandicarboxylic acid chloride, stir for 1 hour, and then heat up to 40-45°C, add 24g of lithium hydroxide, stir, add 25g of aluminum oxide, and stir to obtain the first mixed solution. N,N-dimethylacetamide is added to mix and stir with the first mixed solution to obtain a furyl polymer compound coating solution.
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Abstract
The invention relates to a furyl polymercoating liquid, a bio-based lithium battery diaphragm and preparation methods of the furyl polymercoating liquid and the bio-based lithium battery diaphragm. The preparation method of the furyl polymercoating liquid comprises the following steps of: in an inertatmosphere, adding 2, 5-furandicarbonyl chloride into an organic solvent containing p-phenylenediamine, heating to 35-45 DEG C, adjusting the pH value, and carrying out a polymerization reaction to form a first solution; adding ceramic particles into the first solution, performing mixing and stirring to form a second solution; and mixing the second solution with a viscosity modifier to obtain the furyl polymer coating liquid. According to the prepared lithium battery diaphragm, the needling strength reaches 8.5 N, the longitudinal tensile strength is 1995Kgf / cm < 2 >, the transverse tensile strength is 1987Kgf / cm < 2 >; and the diaphragm is high in puncture resistance, can effectively avoid short circuit and improve safety.
Description
technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a bio-based lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and have become an important part of the development of the new energy industry. Lithium-ion batteries are used in many fields such as power batteries and energy storage power stations, which have greatly promoted the development of society. As a key material affecting the performance of lithium-ion batteries, lithium-ion battery separators have great commercial value. Ion batteries have a very important impact. [0003] Traditional lithium battery separator coating materials mainly include aramidfiber and ceramics. However, the solubility of aramid fibers is poor, and the molecular weight of aramid fibers is strictly required during processing. If th...
Claims
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