Method for preparing lithium ferrous silicate anode material
A technology of lithium ferrosilicate and positive electrode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of uneven particle size of lithium ferrosilicate positive electrode material, improve crystal morphology and coating effect, Controllable morphology and improved performance
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[0025] The preparation method of the lithium ferrous silicate positive electrode material of the present invention is specifically implemented according to the following steps:
[0026] Step 1, add surfactant and sodium silicate to solvent 2 in sequence and stir thoroughly to prepare a mixed solution. The mass ratio of surfactant to sodium silicate is 0-3:1, and the molar ratio of sodium silicate to solvent 2 1:10~50 and then adjust the mixed solution to pH 2~7 with 3~10% sulfuric acid solution to obtain acidic SiO 2 Lotion;
[0027] Step 2, to the acidic SiO obtained in step 1 2 Add oxalic acid to the emulsion and mix evenly, then add a mixed solution of ferrous sulfate and solvent 1 with a molar ratio of 1:30 to 100, the molar ratio of ferrous sulfate, oxalic acid and sodium silicate is 1:1:1, and then wash, Filter and dry to obtain iron ion-coated SiO 2 shell core material;
[0028] Step 3, coating SiO with iron ions obtained in step 2 2 Lithium source compound and car...
Embodiment 1
[0038] Step 1: Add 2g of polyethylene glycol and 0.02mol of sodium silicate to 25ml of ethanol in turn and stir fully to prepare a mixed solution, then adjust the pH value to 5 with 7.5% sulfuric acid solution to obtain acidic SiO 2 Lotion;
[0039] Step 2, to the acidic SiO obtained in step 1 2 Add 0.02 mol of oxalic acid to the emulsion and mix evenly, then add 0.02 mol of ferrous sulfate and 25 ml of deionized water and continue to stir for 3 hours, then wash, centrifugally disperse and dry to obtain iron ion-coated SiO 2 shell core material;
[0040] Step 3, coating SiO with iron ions obtained in step 2 2 Add 0.02mol of lithium carbonate, 5g of glucose and 20ml of acetone to the shell core material, then ball mill and stir, and then dry in vacuum at 80°C for 3 hours to obtain a lithium ferrous silicate precursor, and then put the lithium ferrous silicate precursor into The tube furnace was heated to 410°C under the protection of argon atmosphere for 3 hours, then took i...
Embodiment 2
[0045] Step 1, add 8g P123 and 0.025mol sodium silicate to 20ml of acetone and 20% deionized water in turn and stir fully to prepare a mixed solution, then adjust the pH value to 6 with 9% sulfuric acid solution to obtain acidic SiO 2 Lotion;
[0046] Step 2, to the acidic SiO obtained in step 1 2 Add 0.025 mol of oxalic acid to the emulsion and mix well, then add 0.025 mol of ferrous sulfate, 50 ml of distilled water and 20 ml of alcohol and continue to stir for 5 hours, then wash, centrifugally disperse and dry to obtain iron ion-coated SiO 2 shell core material;
[0047] Step 3, coating SiO with iron ions obtained in step 2 2 Add 0.04mol of lithium citrate tetrahydrate, 1g of ascorbic acid, 0.7g of carbon black and 20ml of alcohol to the core shell material, and then conduct ball milling and stirring, then vacuum dry at 80°C for 3 hours to obtain a lithium ferrous silicate precursor. Put the lithium ferrous silicate precursor into a tube furnace, heat it up to 500°C unde...
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