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Metal organic framework-derived phosphate composite anode material and preparation method thereof

A metal-organic framework and cathode material technology, applied in battery electrodes, active material electrodes, electrochemical generators, etc., can solve the problems of poor kinetic performance of phosphate cathode materials, and improve the specific surface area and electrochemical reactivity , increase porosity, improve the effect of contact area

Inactive Publication Date: 2019-04-12
SHANGHAI AEROSPACE POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is how to solve the problem of poor kinetic performance of phosphate-based positive electrode materials, and provide a MOF-derived phosphate composite positive electrode material, which can simultaneously combine the interface advantages of the MOF material with the electrolyte and the phosphoric acid The thermal stability of the salt material can effectively improve the conductivity of the electrode material and improve the long-term cycle performance of the material

Method used

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  • Metal organic framework-derived phosphate composite anode material and preparation method thereof
  • Metal organic framework-derived phosphate composite anode material and preparation method thereof
  • Metal organic framework-derived phosphate composite anode material and preparation method thereof

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Embodiment 1

[0030] A kind of preparation method of the phosphate composite cathode material derived from MOF, the chemical formula of described phosphate cathode material is Li 3 V 2 (PO 4 ) 3 -MOF-74, its main preparation steps are as follows:

[0031] (1) H 4 DOBDC and VCl 3 Add it into 60ML ethanol solution according to the stoichiometric ratio of 1:2, stir and mix and ultrasonically disperse for 30 minutes, transfer to a high-temperature reaction kettle, put it in a 110°C oven for 24 hours, wash it with ethanol after cooling, and then put it in DMF solvent , activated under argon atmosphere at 70°C for 3 h, and centrifuged to obtain V-MOF-74.

[0032](2) Using the synthesized V-MOF-74 as the vanadium source and carbon source for the reaction, first calculate the V content through the thermogravimetric analysis TGA curve, and calculate the V content according to the ratio of vanadium and LiOH, NH 4 h 2 PO 4 Mix according to the stoichiometric ratio of 1:1.62:1.5, add acetone fo...

Embodiment 2

[0037] (1) H 2 BDC (15mmol, 98%) and FeCl 3 ·6H 2 O (10mmol, 99%) was added to 60mL DMF solution, stirred and mixed evenly, transferred to a high-temperature reaction kettle, placed in a 150°C oven for 24 hours, after cooling, washed with DMF and ethanol several times, and then placed in a 70°C vacuum oven After drying overnight, Fe-BDC was separated by suction filtration.

[0038] (2) Use the synthesized Fe-BDC as the iron source and carbon source of the reaction, first calculate the iron content through the TGA curve, and compare the moles of Fe with LiOH, NH 4 h 2 PO 4 Mix according to the stoichiometric ratio of 1:1.62:1.5, add acetone for wet ball milling for 2 hours, rotate at 500r / min, and mix well. Afterwards, under an argon atmosphere, the tube furnace was heated to 350°C for 4 hours, ball milled again, and then placed in a tube furnace at 700°C, heated and sintered with argon for 10 hours, and the Fe-MOF derived lithium iron phosphate positive electrode was obta...

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Abstract

The invention discloses a metal organic framework-derived phosphate composite anode material and a preparation method thereof. The anode structure is a phosphate material, the surface is coated with carbon, and a microporous bubble structure is arranged in the anode structure; the phosphate is LiMO4 or Li3M'2(PO4)3; M is selected from any one or combination of Fe, Co, Ni and Mn; and M' is selectedfrom any one of combination of Fe, V and Ti. A metal organic framework (MOF) material serves as a metal source and a carbon source at the same time, and is used for preparing the composite anode material by adoption of a high-temperature solid state method after being dispersed with a lithium source compound and a phosphorus source via ball milling; and the material is capable of keeping the highsafety and high specific capacity of polyanion anode materials and greatly improving the specific surface area and electrochemical reactivity on MOF carbon skeleton coating layers generated on the surface of phosphate. The material is capable of improving the conductivity of polyanion phosphate materials and the cycling stability of batteries, and greatly improving the electrochemical performanceof LiMPO4 and Li3M'2(PO4)3 materials.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and relates to a metal-organic framework (MOF)-derived phosphate composite cathode material and a preparation method. Background technique [0002] Lithium-ion batteries have become the mainstream choice of power energy for electric vehicles due to their advantages such as high specific energy, high voltage, long life, good high and low temperature performance, low self-discharge rate and no memory effect. Lithium transition metal phosphates such as LiMPO 4 (M=Fe, Co, Ni, Mn) and Li 3 m 2 (PO 4 ) 3 (M = Fe, V, Ti) is considered to be a promising cathode material for rechargeable batteries due to its high equilibrium potential and theoretical capacity, as well as good ion mobility and excellent thermal stability. [0003] Metal-organic frameworks (Metal-organic Frameworks), or MOFs for short, are versatile porous materials with good crystallinity, composed of metal centers and orga...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525H01M4/02
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 廖喻星王迪王刚庆白雪君
Owner SHANGHAI AEROSPACE POWER TECH
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