Lithium ferrous silicate anode material coated with crystalline carbon and preparation method thereof
A technology of lithium ferrous silicate and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of reducing the volumetric energy density of positive electrode materials, low tap density of products, and poor particle contact performance. Improved electrochemical performance, fine grain size, and high powder purity
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[0022] Example 1:
[0023] Using lithium acetate dihydrate, ferric nitrate, and ethyl orthosilicate as raw materials, weigh the corresponding substances according to the molar ratio of the substances to make the molar ratio of Li:Fe:Si 2:1:1, and measure 1.8ml of ethyl orthosilicate Ester was added to 15ml of ethanol with constant stirring, 0.32ml of acetic acid was added dropwise, 1.640g of lithium acetate was accurately weighed and added to the above mixed solution, after dissolution, 3.256g of ferric nitrate was added, 1.057g of ascorbic acid was mixed into a saturated aqueous solution and added dropwise to In the above-mentioned mixed solution, the mixed solution is transferred to a reaction kettle and reacted at 120°C for 20 hours to obtain a gel mixture, which is then dried in a drying box at 60°C to obtain a dry gel. The dry gel is crushed, pressed into tablets, in N 2 Under the protection of the atmosphere, calcined at 650°C for 10 hours to obtain carbon-coated lithium ir...
Example Embodiment
[0024] Example 2:
[0025] Using lithium acetate, ferric nitrate, and ethyl orthosilicate as raw materials, weigh the corresponding substances according to the molar ratio of the substances so that the molar ratio of Li:Fe:Si is 2:1:1, measure 1.8ml of ethyl orthosilicate and add In 10ml of ethanol with constant stirring, add 0.32ml of acetic acid dropwise, accurately weigh 1.640g of lithium acetate and add to the above mixture, after dissolution, add 3.256g of ferric nitrate, and 0.700g of ascorbic acid into a saturated aqueous solution, and add dropwise to the above mixture In the solution, the mixed solution is transferred to the reaction kettle and reacted at 120°C for 5 hours to obtain a gel mixture, which is then dried in a drying box at 60°C to obtain a dry gel. The dry gel is crushed, pressed into tablets, in N 2 Under the protection of the atmosphere, it was calcined at 650°C for 7 hours to obtain carbon-coated lithium iron silicate powder. Synthetic powder Li 2 FeSiO 4...
Example Embodiment
[0026] Example 3:
[0027] Using lithium acetate dihydrate, ferric nitrate, and ethyl orthosilicate as raw materials, weigh the corresponding substances according to the molar ratio of the substances to make the molar ratio of Li:Fe:Si 2:1:1, and measure 1.8ml of ethyl orthosilicate The ester was added to 18ml of ethanol and kept stirring, 0.32ml of acetic acid was added dropwise, 1.640g of lithium acetate was accurately weighed and added to the above mixture, after dissolution, 3.256g of ferric nitrate was added, and 1.929g of ascorbic acid was mixed into a saturated aqueous solution and added dropwise to In the above-mentioned mixed solution, the mixed solution is transferred to a reaction kettle and reacted at 180°C for 5 hours to obtain a gel mixture, which is then dried in a drying box at 60°C to obtain a dry gel. The dry gel is crushed, pressed into tablets, in N 2 Under the protection of the atmosphere, calcined at 750°C for 10 hours to obtain carbon-coated lithium iron si...
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