Potassium-based dual-ion battery and preparation method thereof
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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
Active Publication Date: 2018-05-22
SHENZHEN INST OF ADVANCED TECH
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[0004] At present, common potassium-ion batteries use Prussian blue / Prussian blue analogues, iron phosphate, ferric fluorosulfate, etc. as positive electrode active materials, and carbon materials as negative electrode active materials. The performance is poor, and the preparation process is relatively complicated
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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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Abstract
The invention discloses a potassium-based dual-ion battery and a preparation method thereof and relates to the field of electrochemical energy storage devices. The potassium-based dual-ion battery comprises a negative electrode, a positive electrode, a membrane between the positive electrode and the negative electrode and an electrolyte, wherein an active material of a negative electrode materialis a porous carbon material capable of reversibly absorbing and desorbing potassium ions; the active material of a positive electrode material is a graphite carbon material capable of reversibly intercalating and deintercalating anions in the electrolyte; and the electrolyte comprises a potassium salt and a non-aqueous solvent. The defects that an existing lithium-ion battery is limited in lithiumresource reserves and high in cost are alleviated, and the problems that an existing potassium-ion battery is limited in electrode material and not ideal in electrochemical properties are solved. According to the dual-ion battery disclosed by the invention, potassium is taken as an energy storage medium, the porous carbon material capable of absorbing and desorbing the potassium ions is taken asa negative active material and expanded graphite capable of being reversibly intercalated and deintercalated is taken as a positive active material, so that the potassium-based dual-ion battery has the advantages of high specific capacity, long cycle life and good security performance.
Description
technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to a potassium-based double-ion battery and a preparation method thereof. Background technique [0002] A secondary battery, also known as a rechargeable battery, is a battery that can be repeatedly charged and discharged and used many times. Compared with non-reusable primary batteries, secondary batteries have the advantages of low cost and less environmental pollution. At present, the main secondary battery technologies include lead-acid batteries, nickel-chromium batteries, nickel-metal hydride batteries, and lithium-ion batteries, among which lithium-ion batteries are the most widely used. With the gradual application of lithium-ion batteries in smart phones, electric vehicles and other fields, the demand for lithium is growing rapidly year by year, but its global reserves are very limited and unevenly distributed, resulting in rapid rise in raw ...
Claims
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