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A method and product for preparing a lithium-ion battery ternary positive electrode material on a metal-organic framework material zif-8

A metal-organic framework, ZIF-8 technology, applied in battery electrodes, electrical components, secondary batteries, etc., to achieve the effects of simple synthesis steps, stable ternary material structure, and excellent electrochemical performance

Active Publication Date: 2020-08-25
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More importantly, the synthesis of lithium-ion battery ternary cathode materials on ZIF-8 has never been reported.

Method used

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  • A method and product for preparing a lithium-ion battery ternary positive electrode material on a metal-organic framework material zif-8

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preparation example Construction

[0020] 1) Preparation of metal-organic framework material ZIF-8: according to the molar ratio of zinc nitrate hexahydrate and 2-methylimidazole as 1:1~4, weigh an appropriate amount of zinc nitrate hexahydrate in a beaker, and add to the beaker 100 mL of anhydrous methanol, stirred until fully dissolved, marked as solution A; weighed an appropriate amount of 2-methylimidazole in a 200 mL beaker, and added 100 mL of anhydrous methanol, fully dissolved, marked as solution B. Quickly pour the uniformly dissolved B solution into the A solution that is being ultrasonicated, and stir for 15 min, and centrifuge the obtained milky white liquid with a desktop high-speed centrifuge to separate the product. The separated product is washed twice with water and ethanol successively, and the cleaned product is sintered in a muffle furnace at 700-900° C. for 1-5 hours.

[0021] 2) Preparation of C solution: Lithium salt, nickel salt, cobalt salt and manganese salt are synthesized according t...

Embodiment 1

[0027] ZIF-8@LiNi 0.5 co 0.2 mn 0.3 o 2 Preparation of cathode material

[0028] Weigh an appropriate amount of zinc nitrate hexahydrate in a beaker, add 100 mL of anhydrous methanol to the beaker, stir until fully dissolved, and mark it as solution A; weigh an appropriate amount of 2-methylimidazole in a 200 mL beaker, and add 100 mL of Water methanol, fully dissolved, marked as B solution. Quickly pour the uniformly dissolved B solution into the A solution that is being ultrasonicated, and stir for 15 min, and centrifuge the obtained milky white liquid with a desktop high-speed centrifuge to separate the product. After separating the product, the product was successively washed twice with water and ethanol. The cleaned product was sintered in a muffle furnace at 700°C for 2h. Lithium salt, nickel salt, cobalt salt and manganese salt were synthesized according to LiNi 0.5 co 0.2 mn 0.3 o 2Calculate the amount of material used. A solution was prepared by dissolving ...

Embodiment 2

[0030] ZIF-8@LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation of cathode material

[0031] Weigh an appropriate amount of zinc nitrate hexahydrate in a beaker, add 100 mL of anhydrous methanol to the beaker, stir until fully dissolved, and mark it as solution A; weigh an appropriate amount of 2-methylimidazole in a 200 mL beaker, and add 100 mL of Water methanol, fully dissolved, marked as B solution. Quickly pour the uniformly dissolved B solution into the A solution that is being ultrasonicated, and stir for 15 min, and centrifuge the obtained milky white liquid with a desktop high-speed centrifuge to separate the product. After separating the product, the product was successively washed twice with water and ethanol. The cleaned product was sintered in a muffle furnace at 700°C for 2h. Lithium salt, nickel salt, cobalt salt and manganese salt were synthesized according to LiNi 0.6 co 0.2 mn 0.6 o 2 Calculate the amount of material used. A solution was prepared by dissolving...

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Abstract

The invention discloses a metal-organic skeleton material ZIF-8 to prepare ternary cathode material for lithium ion battery. The salt solution of the ternary materials can flow into the pores of the skeleton materials as much as possible by ultrasonic method, and then the water in the salt solution is evaporated in a high-temperature oven to leave the salts of Li, Ni, Co and Mn, and finally the ternary cathode materials are formed after the high-temperature sintering reaction. A metal-organic skeleton material ZIF is prepare from that metal-organic skeleton material ZIF and the metal-organic skeleton material ZIF. The particle size distribution of the ternary cathode material prepared by the method is uniform and the electrochemical performance is good, which is dodecahedron structure. Although the introduction of skeletal materials will lead to the reduction of the gram capacity of the material, sacrificing this small part of the gram capacity in exchange for the superior cycling properties of the material.

Description

technical field [0001] The invention relates to the technical field of manufacturing positive electrode materials of lithium ion batteries, in particular to a method for preparing a lithium ion battery ternary positive electrode material on a metal organic framework material ZIF-8 and the obtained product. Background technique [0002] Lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement of cathode materials. There are many systems of cathode materials for lithium-ion batteries. At present, the layered lithium cobalt oxide series LiCoO is mainly used for practical applications. 2 , layered lithium nickel oxide series LiNiO 2 and spinel-like lithium manganese oxide series LiMn 2 o 4 . However, the above-mentioned systems all have significant deficiencies, which seriously affect their practical application. The nickel-cobalt lithium manganese oxide multi-element electrode material newly developed in the 21st century i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 卢鹏刘耀春封平净李明
Owner 淮安新能源材料技术研究院
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