Potassium-based dual-ion battery and preparation method thereof
A dual-ion battery technology, applied in battery electrodes, non-aqueous electrolyte storage batteries, circuits, etc., can solve problems such as poor cycle performance, low capacity of potassium ion batteries, complex preparation process, etc., to achieve improved cycle life, low price, chemical Highly stable effect
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[0124] As a preferred embodiment, the preparation method of potassium-based double-ion battery comprises the following steps:
[0125] a) Prepare the negative electrode: mix the active material of the negative electrode material, the conductive agent, the binder and the solvent to make a slurry; then evenly coat the negative electrode material slurry on the surface of the negative electrode current collector, and cut it into pieces after drying to obtain the required size. negative electrode;
[0126] b) Prepare the electrolyte: dissolve the potassium salt electrolyte in a non-aqueous solvent, and mix thoroughly to obtain the electrolyte;
[0127] c) Preparing a diaphragm: cutting a porous polymer film, an inorganic porous film or an organic-inorganic composite diaphragm into a required size as a diaphragm;
[0128] d) Prepare the positive electrode: mix the active material of the positive electrode material, the conductive agent, the binder, and the solvent to form a slurry;...
Embodiment 1
[0136] A potassium-based double-ion battery includes a negative electrode, a separator, an electrolyte, and a positive electrode.
[0137]Preparation of negative electrode: Add 0.8g of activated carbon, 0.1g of conductive carbon black, and 0.1g of polytetrafluoroethylene into 2mL of nitrogen-methylpyrrolidone solution, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on the surface of carbon-coated aluminum foil and vacuum dried. The electrode sheet obtained by drying was cut into discs with a diameter of 12 mm, which were compacted and used as negative electrodes for future use.
[0138] Preparation of the diaphragm: cut the glass fiber diaphragm into a disc with a diameter of 16 mm, and use it as a diaphragm after drying.
[0139] Preparation of electrolyte: Weigh 0.9204g potassium hexafluorophosphate and add it to 5mL mixed solvent of ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate (volume ratio is 4:3:2), stir until potassium hexa...
Embodiment 2
[0143] A potassium-based double-ion battery, wherein the negative electrode material active material adopts activated carbon fiber, and the others are the same as in Example 1.
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