Modified phosphate glass and preparation method and its application in electrochemical devices
A technology of phosphate glass and orthophosphate, which is applied in the field of electrochemical materials, can solve the problems that the capacity cycle stability cannot meet the needs of high-power devices, achieve good application prospects, improve cycle stability, and increase the effect of reversible capacity
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[0032] The third embodiment of the present invention provides an application of the above modified phosphate glass in an electrochemical device.
[0033] The electrochemical devices of the present invention include lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, supercapacitors, sensors, and the like.
[0034] The fourth embodiment of the present invention provides an electrode, including an active material, a conductive material, a binder and a current collector, and the binder binds the active material and the conductive material on the current collector; the active material is The above modified phosphate glass.
[0035] In some examples of this embodiment, the conductive material is acetylene black.
[0036] In some examples of this embodiment, the binder is PVDF (polyvinylidene fluoride).
[0037] In some examples of this embodiment, the mass ratio of the active material, the conductive material, and the binder is 6-8:1.5-2.5:0.5-1.5.
[0038] A f...
Embodiment 1
[0045] Example 1: TVP sample
[0046] Weigh tellurium dioxide (TeO 2 ): 1.8869g, vanadium pentoxide (V 2 O 5 ): 6.4391 g and ammonium dihydrogen phosphate (NH 4 H 2 PO 4): 2.7132g, fully ground in a mortar, melted at 950 °C in an air atmosphere, shaped, annealed at 280 °C for 2 h, cooled, and finally obtained glass, which is recorded as TVP. XRD pattern such as figure 1 As shown, it can be seen that the prepared TVP samples are amorphous and glass. X-ray photoelectron spectroscopy figure 2 shown.
[0047] Grind the obtained glass into powder, take glass powder, acetylene black and PVDF in a mass ratio of 7:2:1 and put them in a ball mill tank to dissolve in N-methyl-2-pyrrolidone and fully ball-mill and mix, and then the product Coated on copper foil, vacuum-dried at 110°C, cooled naturally, and cut into 15mm diameter discs with a microtome, with a metal lithium sheet as the counter electrode, Celgard 2400 polypropylene film as the separator, and the electrolyte solu...
Embodiment 2
[0049] Example 2: 30RH sample
[0050] The glass powder obtained in Example 1 was placed on a petri dish, treated in an air atmosphere at a temperature of 60°C and a humidity of 30RH% for 5 days, taken out and ground into powder, which is a 30RH sample.
[0051] The 30RH sample powder, acetylene black and PVDF were put into a ball mill in a mass ratio of 7:2:1, dissolved in N-methyl-2-pyrrolidone and thoroughly mixed by ball milling. ℃ vacuum drying, after natural cooling, use a microtome to cut into 15mm diameter discs, with a metal lithium sheet as the counter electrode, Celgard 2400 polypropylene film as the diaphragm, and the electrolyte containing 1 mol·L -1 LiPF 6 A mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) (the volume ratio of EC, DMC and DEC is 1:1:1) in an argon-filled glove box The CR2016 button battery is assembled in the middle, and then the battery is sealed by a sealing machine to obtain a button half battery. Fi...
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