Preparation method of potassium ion battery positive electrode material potassium vanadium fluorophosphates/carbon

A technology of potassium vanadium fluorophosphate and battery positive electrode, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low diffusion kinetic performance, and achieve the effects of high conductivity, avoidance of coexistence and uniform particles

Inactive Publication Date: 2018-07-06
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although potassium-ion batteries have many of the above advantages, the radius of potassium ions (r=0.138nm) is greater than that of lithium ions (0.068nm), resulting in K + Diffusion kinetics in commonly used cathode materials for lithium-ion batteries are much lower than that of Li + , so a suitable cathode material for potassium-ion batteries must have an allowable K + A large channel that passes quickly, and at K + The process of intercalation and deintercalation still maintains a stable structure
At present, there is still little research on potassium-ion batteries, so the development of suitable K + A cathode material with fast intercalation and deintercalation and stable structure has very important practical significance

Method used

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  • Preparation method of potassium ion battery positive electrode material potassium vanadium fluorophosphates/carbon
  • Preparation method of potassium ion battery positive electrode material potassium vanadium fluorophosphates/carbon
  • Preparation method of potassium ion battery positive electrode material potassium vanadium fluorophosphates/carbon

Examples

Experimental program
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Embodiment example 1

[0019] Implementation case 1: with 0.015mol vanadium pentoxide, 0.03mol ammonium dihydrogen phosphate, 0.045mol potassium fluoride and 0.0075mol sucrose, and all transfer in the ball mill jar, and add the polyoxyethylene glycol of solid mixture weight 20% ( The molecular weight is 200), start the ball mill, mix the mixture evenly, and dry the mixture in an oven at 180°C, transfer the dried mixture to a tube furnace, under the protection of an argon atmosphere, at a rate of 2°C / min The heating rate is heated to 350°C and kept at a constant temperature for 4 hours, then heated to 700°C, kept at a constant temperature for 2 hours, and cooled to room temperature with the furnace to obtain the positive electrode material K for a potassium ion battery. 3 V 2 (PO 4 ) 2 f 3 / C Composite. figure 1 is the X-ray diffraction pattern of the material, figure 2 A scanning electron microscope image of the material.

[0020] The prepared potassium ion cathode material K 3 V 2 (PO4) 2...

Embodiment example 2

[0021] Implementation example 2: 0.015mol vanadium trioxide, 0.03mol diammonium hydrogen phosphate, 0.045mol potassium hydroxide, 0.045mol ammonium fluoride and 0.015mol glucose are all transferred to a ball mill jar, and 15% by weight of the solid mixture is added Polyethylene glycol (molecular weight: 400), start the ball mill, mix the mixture evenly, then place the mixture in an oven at 160°C, dry for 24h, transfer the dried mixture to a tube furnace, and protect it in an argon atmosphere , heated to 400°C at a heating rate of 5°C / min and held at a constant temperature for 6 hours, then heated to 750°C, held at a constant temperature for 6 hours, and cooled to room temperature with the furnace to obtain the positive electrode material K for a potassium ion battery 3 V 2 (PO 4 ) 2 f 3 / C Composite. prepared K 3 V 2 (PO 4 ) 2 f 3 / C Composite rough surface, see image 3 The scanning electron microscope image is shown.

[0022] The prepared potassium ion cathode mat...

Embodiment example 3

[0023] Implementation case 3: 0.015mol vanadium pentoxide, 0.03mol diammonium phosphate, 0.045mol potassium fluoride and 0.0075mol sucrose are all transferred to a ball mill jar, and the polyethylene glycol ( The molecular weight is 400), start the ball mill, mix the mixture evenly, place the mixture in an oven at 180°C, and dry it for 12h, then transfer the dried mixture to a tube furnace, under the protection of an argon atmosphere, at 10°C / Min heating rate to 350°C and constant temperature for 8 hours, then heated to 800°C, constant temperature for 3 hours, and cooled to room temperature with the furnace, that is, the positive electrode material K for potassium ion battery 3 V 2 (PO 4 ) 2 f 3 / C Composite.

[0024] The prepared potassium ion cathode material K 3 V 2 (PO 4 ) 2 f 3 / C composite material, acetylene black and PVDF are ground and mixed evenly in a mass ratio of 8:1:1, and an appropriate amount of NMP is added dropwise to make a slurry, and the slurry i...

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Abstract

The invention discloses a preparation method of a potassium ion battery positive electrode material potassium vanadium fluorophosphates / carbon. The preparation method comprises the following steps: mixing reaction raw materials and a polyethylene glycol solution to form a viscous solution, drying the mixture, roasting under the condition of high-temperature inert atmosphere and synthesizing the K3V2(PO4)2F3 / C composite material. The reaction solid raw materials are subjected to reaction in the mixing process by utilizing the high solubility characteristic of the polyethylene glycol to form a polyethylene glycol mixed solution dispersed uniformly, so that the defects of long conventional liquid phase reaction time and non-uniform solid phase reaction are overcome, the method is low in timeconsumption and simple in operation, and the synthesized material granules are fine and uniform. Saccharide compounds and the polyethyle glycol are pyrolyzed at high temperature and under inert atmosphere to generate high-conductivity carbon in situ, the surface of the active material is coated with the high-conductivity carbon, agglomeration and growth of the active material granules are prevented, the K3V2(PO4)2F3 / C potassium ion battery positive electrode material with high conductivity is obtained, and the material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a method for preparing a high-capacity potassium ion positive electrode material vanadium potassium fluorophosphate / carbon. Background technique [0002] The rapid development of social industrialization has an increasing demand for energy, and the current energy is mainly disposable resources such as fossil fuels. As the consumption of non-renewable resources such as fossil fuels increases sharply year by year, it will cause serious environmental pollution and future resource depletion. In order to cope with the crisis of environmental pollution and energy shortage, the development of renewable clean energy (such as solar energy, tidal energy, wind energy, etc.) has become a very urgent priority, and energy storage technology has also become a key technology for the development and application of new energy. Due to its high efficiency and low cost, secondary batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/582H01M4/5825H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 陈权启张信梅呼丽珍
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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