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
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[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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