Composite cathode material and preparation method thereof
A technology of composite cathode material and mixed solution, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of insufficient cycle stability, rapid discharge voltage decay in commercial market, low initial capacity, etc., to increase lithium Effect of ion diffusion and electron transport rate, improving rate capability and cycling stability, and increasing electron transport rate
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Embodiment 1
[0058] According to the chemical formula of lithium iron phosphate cathode material (LiFePO 4 The molar ratio shown in ) weighs lithium carbonate, iron oxyhydroxide and ammonium phosphate and dissolves them in deionized water to prepare aqueous solutions with a concentration of 0.01mol / L respectively, and mix the above aqueous solutions to obtain a mixed solution.
[0059] According to the molar ratio of the total amount of metal ions in the above mixed solution to citric acid being 1:1, citric acid was added to the above mixed solution to obtain a mixture.
[0060] Stir the above mixture at 80°C for 20h, evaporate all the deionized water to obtain a gel, dry the gel in a vacuum oven at a temperature of 80°C for 20h, take out the dry matter and perform ball milling to obtain Powder.
[0061] The above powder was sintered in a nitrogen atmosphere from 25°C to 550°C at 1°C / min for 10 hours, then raised to 650°C in a nitrogen atmosphere at 1°C / min and kept for 24 hours, and natu...
Embodiment 2
[0067] Accurately weigh the composite positive electrode material prepared in Example 1, SuperP (conductive carbon black), PVDF (polyvinylidene fluoride, binding agent) according to the ratio of 90:5:5 in mass ratio, and then PVDF, SP (conductive Carbon black), the composite positive electrode material were added to NMP (N-methylpyrrolidone) in turn and stirred for 12 hours to obtain a uniformly mixed slurry;
[0068] The obtained slurry was evenly coated on an aluminum foil, and then transferred to a vacuum drying oven at 120° C., and dried in vacuum for 12 hours to obtain a positive electrode sheet.
[0069] The positive electrode is the above-mentioned positive electrode sheet, the negative electrode is a metal lithium sheet, the separator is PE (polypropylene), and 0.1mol / L LiPF 6 As the electrolyte, the cell assembly was performed in an argon-filled glove box to obtain a button cell.
[0070] Scrub off the electrolyte on the button cell with absolute ethanol, let it stan...
Embodiment 3
[0076] According to the chemical formula of lithium iron phosphate cathode material (LiFePO 4 In the molar ratio shown in ), lithium hydroxide, iron sulfate and ammonium hydrogen phosphate were weighed and dissolved in deionized water to prepare an aqueous solution with a concentration of 1 mol / L, and the above aqueous solutions were mixed to obtain a mixed solution.
[0077] Glycine is added to the above mixed solution according to the molar ratio of the total amount of metal ions in the above mixed solution to glycine being 1:2 to obtain a mixture.
[0078] Stir the above mixture at 100° C. for 10 h, evaporate all the deionized water to dryness to obtain a gel substance, and then vacuum dry the gel substance in a vacuum oven at a temperature of 100° C. for 12 hours, then take out the dry matter and perform ball milling, to obtain a powder.
[0079] Sinter the above powder in an argon atmosphere at a rate of 2 °C / min from 25 °C to 600 °C for 6 hours, then in an argon atmosph...
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