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Vanadium oxygen potassium fluorophosphate, preparation method and application thereof, and potassium ion battery

A technology of potassium vanadyl fluorophosphate and potassium ions, which is applied in the field of potassium vanadyl fluorophosphate and its preparation, can solve the problems of low working voltage and energy density, poor discharge specific capacity and cycle performance of lithium-ion batteries, and achieve good discharge Specific capacity, good electrochemical performance, and the effect of improving cycle performance

Active Publication Date: 2021-06-29
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large ionic radius and slow ion migration kinetics of potassium ions in potassium ion batteries, there are still few studies on positive electrode materials for potassium ion batteries. , but their operating voltage and energy density are relatively low, making the discharge specific capacity and cycle performance of lithium-ion batteries poor

Method used

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  • Vanadium oxygen potassium fluorophosphate, preparation method and application thereof, and potassium ion battery
  • Vanadium oxygen potassium fluorophosphate, preparation method and application thereof, and potassium ion battery
  • Vanadium oxygen potassium fluorophosphate, preparation method and application thereof, and potassium ion battery

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preparation example Construction

[0031] The invention provides a kind of preparation method of potassium vanadyl fluorophosphate, comprising the following steps:

[0032] Take Na 3 (VO) 2 (PO 4 ) 2 F is the positive electrode material, potassium is the negative electrode material, and KPF 6 The organic solution is used as an electrolyte to carry out constant current electrochemical charge and discharge to obtain potassium fluorovanadyl phosphate.

[0033] The present invention is to raw material Na 3 (VO) 2 (PO 4 ) 2 F, the source of potassium has no special requirements, and the above-mentioned raw materials commercially available in the art can be used.

[0034] In the present invention, the KPF 6 The concentration of the organic solution is preferably 0.5-1.5M, more preferably 1M; the KPF 6 The solvent of organic solution is preferably multiple in propylene carbonate (PC), fluoroethylene carbonate (FEC) and ethylene carbonate (EC); Further, in the present invention, described PC has lower freezin...

Embodiment 1

[0056] Using metallic potassium as the negative electrode material, Na 3 (VO) 2 (PO 4 ) 2 F is the positive electrode material, KPF with a concentration of 1M 6 The organic solution (the solvent is PC+FEC, wherein the volume ratio of PC to FEC is 20:1) is used as the electrolyte, and at room temperature in the voltage range of 2 to 4.5V, at 20mA g -1 Carry out constant current charge and discharge, and cycle 10 times to obtain potassium vanadyl fluorophosphate K 3 (VO) 2 (PO 4 ) 2 F.

[0057] The XRD figure of gained potassium vanadyl fluorophosphate is as follows figure 1 shown by figure 1 It can be seen that the diffraction peak of the obtained product belongs to the diffraction peak of the unique NASICON structure of the fluorophosphate main group, and has a strong diffraction peak, which shows that the obtained product has good crystallinity and a relatively stable crystal structure.

[0058] Use dimethyl carbonate (DMC) to obtain potassium vanadyl fluorophosphat...

Embodiment 2

[0062] The difference between Example 2 and Example 1 is that the electrolyte solution is completely replaced by 1M KPF 6 +EC+FPC (the volume ratio of EC and PC is 20:1), and the rest of the operations are the same to obtain a lithium-ion battery.

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Abstract

The invention provides vanadium oxygen potassium fluorophosphate, a preparation method and application thereof, and a potassium ion battery, and belongs to the technical field of lithium ion batteries. According to the invention, Na3(VO)2(PO4)2F is used as a raw material, the Na3(VO)2(PO4)2F has a relatively large polyanion group, ion exchange is carried out in a constant-current electrochemical charging and discharging mode, and the obtained vanadium oxygen potassium fluorophosphate has a stable crystal structure and can inhibit a volume effect of deintercalation of potassium ions in a charging and discharging process when being used as a lithium ion positive electrode active material, so that the cycle performance of the lithium ion battery is improved; fluorine ions have strong electronegativity and induction effect, and can induce the redox potential of V, so that the vanadium oxygen potassium fluorophosphate has higher working voltage. Meanwhile, the obtained vanadium oxygen potassium fluorophosphate has good low-temperature performance and has good specific capacity at the temperature of -25 DEG C to 25 DEG C.

Description

technical field [0001] The invention relates to the technical field of potassium ion batteries, in particular to potassium vanadyl fluorophosphate, its preparation method and application, and a potassium ion battery. Background technique [0002] With the increasing global energy crisis, rechargeable lithium-ion batteries have been widely used in energy storage systems. However, due to the scarcity of lithium resources and the increasing demand for development, the cost of lithium-ion batteries is increasing, which virtually limits their application in large-scale energy storage systems. Therefore, finding a secondary battery with abundant resources, low price, high performance and high energy density has become an urgent problem to be solved. [0003] Potassium and lithium belong to the same main group, have similar physical and chemical properties, and the abundance of potassium resource reserves is relatively high, and the price is cheap. At the same time, potassium doe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14H01M4/58H01M10/054
CPCC25B1/14H01M4/5825H01M10/054H01M2004/028Y02E60/10
Inventor 吴兴隆谷振一吕红艳
Owner NORTHEAST NORMAL UNIVERSITY
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