Preparation method of electrode supporting zeolite imidazole diaphragm of lithium ion battery

A technology for lithium-ion batteries and diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as complex production methods, and achieve the effects of simple and easy-to-operate manufacturing processes, high porosity, and high chemical stability

Inactive Publication Date: 2018-08-28
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Ji-AeChoi et al. (Enhancement of thermal stability and cycling performance in lithium-ion cells through the use of ceramic-coated separators) in this article use ceramics to coat organic separators, the liquid absorption of inorganic particles and the polymer separators The combination of flexibility allows composite membranes to exhibit superior properties, but this method of production is complex

Method used

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  • Preparation method of electrode supporting zeolite imidazole diaphragm of lithium ion battery
  • Preparation method of electrode supporting zeolite imidazole diaphragm of lithium ion battery

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Effect test

Embodiment 1

[0013] (1) ZIF-67 is a porous structure assembled by metal cobalt and organic ligands. Its typical synthesis method is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in methanol solution respectively. The 2-methylimidazole solution was then added to the cobalt nitrate hexahydrate solution under vigorous stirring and stirred for 1 min, and aged at room temperature for 10 h. The resulting purple precipitate was collected by centrifugation, washed three times with ethanol, and dried under vacuum at 80°C for 24h.

[0014] (2) LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM) electrode material, acetylene black and polyvinylidene fluoride (PVDF) were dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1, and a uniform slurry was formed after vigorous stirring, and then The slurry was uniformly coated on an aluminum foil, and dried under vacuum at 120°C for 12 h.

[0015] (3) The prepared ZIF-67 was ground into powder, and then added to the mixed solut...

Embodiment 2

[0018] (1) ZIF-67 is a porous structure assembled by metal cobalt and organic ligands. Its typical synthesis method is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in methanol solution respectively. Then the 2-methylimidazole solution was added to the cobalt nitrate hexahydrate solution under vigorous stirring and stirred for 1 min, and aged at room temperature for 20 h. The resulting purple precipitate was collected by centrifugation, washed three times with ethanol, and dried under vacuum at 80°C for 24h.

[0019] (2) LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM) electrode material, acetylene black and polyvinylidene fluoride (PVDF) were dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1, and a uniform slurry was formed after vigorous stirring, and then The slurry was uniformly coated on an aluminum foil, and dried under vacuum at 120°C for 12 h.

[0020] (3) The prepared ZIF-67 was ground into powder, and then added to the mixed solut...

Embodiment 3

[0023] (1) ZIF-67 is a porous structure assembled by metal cobalt and organic ligands. Its typical synthesis method is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in methanol solution respectively. The 2-methylimidazole solution was then added to the cobalt nitrate hexahydrate solution under vigorous stirring and stirring was continued for 5 h. The resulting purple precipitate was collected by centrifugation, washed three times with ethanol, and dried under vacuum at 80°C for 24h.

[0024] (2) LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM) electrode material, acetylene black and polyvinylidene fluoride (PVDF) were dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1, and a uniform slurry was formed after vigorous stirring, and then The slurry was uniformly coated on an aluminum foil, and dried under vacuum at 120°C for 12 h.

[0025] (3) The prepared ZIF-67 was ground into powder, and then added to the mixed solution of PVDF and NMP. Stir...

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Abstract

The invention discloses a preparation method of an electrode supporting zeolite imidazole diaphragm of a lithium ion battery. The porous diaphragm disclosed by the invention is prepared from Zeoliticimidazolate fraemwroks (ZIFs), wherein the Zeolitic imidazolate fraemwroks are Metal organic frameworks (MOFs) which are prepared from tetrahedral coordination configuration transition metal of cobalt, zinc, copper and the like, levomisole and derivative ligand coordination of the transition metal and the levomisole, and the ZIFs are a novel MOFs material. According to the preparation method disclosed by the invention, the prepared ZIF-67 is directly covered to the surface of an electrode material to form the electrode supporting diaphragm. Compared with a polyolefin diaphragm, the ZIF-67 diaphragm has good electrolyte wettability, high-temperature stability, higher discharge capacity and better cycling stability. The ZIF-67 is proved to have the potential of serving as a lithium ion battery diaphragm.

Description

technical field [0001] The invention specifically relates to a lithium-ion battery electrode-supported zeolite imidazole diaphragm and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Among the various components that make up the battery, the separator plays an important role. Its structure and performance determine the interface structure and internal resistance of the battery, which greatly affects the performance of the battery, including the energy and power density of the battery, cycle life and safety performance etc. With the continuous development of lithium-ion batteries in the energy storage and electric vehicle markets, the demand for lithium battery separators continues to increase. At present, my country is already the world's largest lithium battery production and manufacturing base, the second largest lithium battery producer and exporter, and my country's demand for separators is increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 沈建兴陈攀代孟李敏王帅
Owner QILU UNIV OF TECH
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