Application of selenium-based composite material as positive electrode active material in barium ion battery, barium ion battery and preparation method thereof
A positive electrode active material and composite material technology, applied in the field of electrochemical energy storage devices, can solve the problems of battery capacity, cycle performance not reaching a good level, limited lithium resource reserves, complex preparation process, etc., to improve cycle stability, High energy density, the effect of alleviating the dissolution effect
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Embodiment approach
[0157] As a preferred embodiment, the preparation method of barium ion battery comprises the following steps:
[0158] a) Preparation of negative electrode: the metal, alloy or metal composite of required size is used as negative electrode after surface treatment;
[0159] b) Preparation of electrolyte solution: dissolving the barium salt electrolyte in the corresponding non-aqueous solvent, and fully mixing to obtain the electrolyte solution;
[0160] c) Prepare the diaphragm: cut the diaphragm into the required size and dry it;
[0161] 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; then evenly coat the positive electrode material slurry on the surface of the positive electrode current collector, and cut it into pieces after drying to obtain the required size. positive electrode;
[0162] Assemble the negative electrode obtained in step a), the electrolyte so...
Embodiment 1
[0171] A barium ion (barium-selenium) battery includes a negative pole, a diaphragm, an electrolyte and a positive pole.
[0172] Preparation of negative electrode: barium block is pressed into 50 μm thickness barium sheet, and rolled into a diameter of 12mm disc in an argon atmosphere for subsequent use;
[0173] Preparing the diaphragm: cut the glass fiber film into a disc with a diameter of 16 mm and use it as a diaphragm for later use;
[0174] Preparation of electrolyte: Weigh 2.18g barium trifluoromethanesulfonate and add to 5mL ethylene carbonate (EC): dimethyl carbonate (DMC): ethyl methyl carbonate (EMC) (volume ratio is 4:3:2), Dissolve completely, stir well and use as electrolyte for later use;
[0175] Preparation of positive electrode: Add 0.8g of selenium / carbon nanotube material, 0.1g of conductive carbon black, and 0.1g of polytetrafluoroethylene into 2mL of nitrogen methyl pyrrolidone solution, fully grind to obtain a uniform slurry; then coat the slurry even...
Embodiment 2-11
[0178] The barium-selenium battery preparation process of Example 2-11 and Example 1 are different except that the positive electrode active material used when preparing the positive electrode is different, and all other steps and materials used are the same, while the barium-selenium battery of Example 2-11 The energy storage performance is tested and compared with the performance of Example 1. Battery testing includes energy density and specific capacity, and the specific test methods are as follows:
[0179] Cycle charge and discharge: Cycle charge and discharge is carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mA / g, the specific capacity of the material = current * time / sample mass, the energy density of the material = specific capacity of the material * platform voltage of the battery, the charging and discharging conditions depend on the needs of the ex...
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Abstract
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