Preparation method of trimetallic MOF-derived ternary cathode material

A positive electrode material and three-metal technology, which is applied in the field of preparation of three-metal MOF-derived ternary positive electrode materials, can solve the problems of poor safety and cycle stability of ternary batteries, achieve reduced formation, increase infiltration degree, and improve cycle stability sexual effect

Inactive Publication Date: 2019-04-05
SHANGHAI AEROSPACE POWER TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a three-metal MOF-derived ternary positive electrode material, so as to overcome the shortcomings of existing ternary positive electrode materials such as poor cycle stability under high-rate charge-discharge performance and poor safety of ternary batteries.

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  • Preparation method of trimetallic MOF-derived ternary cathode material
  • Preparation method of trimetallic MOF-derived ternary cathode material
  • Preparation method of trimetallic MOF-derived ternary cathode material

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[0028] Trimetallic MOF derived ternary positive electrode material and preparation method thereof comprise the following steps:

[0029] Add nickel salt, cobalt salt, manganese salt and organic ligand (5-10mmol) with a molar ratio of x:y:1-x-y:1 to 60ml of solvent, stir for 30min and mix well, then put it into the reaction kettle, React in an oven at 110-150°C for 24-48h, wash three times with one or more of DMF, methanol and ethanol, and then centrifugally dry at 105-135°C for 12-24h to obtain a trimetallic MOF product; the nickel, Cobalt and manganese salts are one or more of nitrates, chlorides and acetates; the organic ligands are 2,5-dihydroxyterephthalic acid, 1,4-terephthalic acid, One or more of 1,3,5-benzenetricarboxylic acid and 1,2,4,5-benzenetetracarboxylic acid; the solvent used is one or more of DMF, methanol and ethanol.

[0030] The obtained tri-metallic MOF material and lithium source were mixed by high-speed ball milling at a molar ratio of 1:1.08-1.3, and t...

Embodiment 1

[0032] A method for preparing a trimetallic MOF-derived ternary cathode material, the obtained material is abbreviated as NCM-MOF-74:

[0033]1) Preparation of trimetallic MOF precursor, accurately weigh 7.2mmol nickel nitrate, 2.4mmol cobalt nitrate, 2.4mmol manganese nitrate and 12mmol 2,5-dihydroxyterephthalic acid, add 60mL DMF and absolute ethanol (3:1 ) in the mixed solution, stirred thoroughly, ultrasonically dispersed for 30min, placed in a 135°C oven for hydrothermal reaction for 24h, cooled to room temperature naturally, filtered or centrifuged, washed with DMF and ethanol three times, and then soaked in aqueous methanol overnight. Replace the solvent molecules in the structure, and finally dry at 110°C to obtain Ni 0.6 co 0.2 mn 0.2 - MOF-74;

[0034] 2) Then weigh Ni with a molar ratio of 1:1.08 0.6 co 0.2 mn 0.2 -MOF-74 with LiOH·H 2 O was mixed by ball milling in acetone solvent, then heated up to 350°C at a rate of 5°C / min, N 2 Keep it under the atmosphe...

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Abstract

The invention discloses a preparation method of a trimetallic MOF-derived ternary cathode material. The trimetallic MOF-derived ternary cathode material comprises the following steps of: the step 1: employing a nickel-cobalt-manganese trimetallic organic framework material formed by solvothermal reaction as a reaction precursor; and the step 2: performing preparation by employing the reaction precursor and a lithium source by employing a high-temperature solid phase method to obtain a trimetallic MOF-derived ternary cathode material, wherein the trimetallic MOF-derived ternary cathode materialis Liz(NixCoyMn1-x-y)O2 with a surface coated with carbon, 0<=x<=1, 0<=y<=1, 0<=1-x-y<=1 and 1.08<=z<=1.3. The preparation method of the trimetallic MOF-derived ternary cathode material changes the coating means of complexity and difficult control in morphology, employs a simple and practicable mode to introduce an MOF carbon skeleton for coating without influence of the structure phase of the ternary material so as to greatly improve the circulation stability, the rate capability and the safety of the material and have potential application prospects.

Description

technical field [0001] The invention relates to the field of metal-organic framework materials, in particular to a method for preparing a three-metal MOF-derived ternary cathode material. Background technique [0002] With global energy shortage becoming one of the growing problems of the 21st century, people have begun to replace non-renewable fossil fuels with other green energy sources, such as solar, wind and hydroelectric power. Unlike traditional fossil fuels, most of these green energy sources are subject to natural constraints that make it impossible to provide a sustainable and reliable energy supply, while difficulties in energy storage and management increase costs. With the increasing number of miniature electronic devices and the rapid development of electronic technology, power storage is gradually developing in the direction of small size, stability and portability. As an important energy storage technology, lithium batteries have been extensively studied due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 廖喻星白雪君宋晓波王刚庆
Owner SHANGHAI AEROSPACE POWER TECH
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