Method for preparing porous lithium-iron silicate/carbon composite material for positive pole of lithium ion battery
A lithium ion battery, lithium iron silicate technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as conductivity, lithium ion mobility, etc., and achieve the effects of low cost, wide source and high safety
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Embodiment 1
[0029] Mix and dissolve 7.4g of lithium carbonate, 18g of ferrous nitrate and 22.4mL of tetraethyl orthosilicate in 100mL of water, then add 20g of polyvinyl alcohol-sodium gluconate dual-template directing agent and 3g of acetylene black, stir the above materials for 1 hour and mix well , adjust the pH to 3 with hydrochloric acid, then ultrasonically disperse for 30 minutes, put it into a hydrothermal kettle, and react at 200°C for 24 hours under the condition of being filled with inert gas;
[0030] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then vacuum-dried in a vacuum oven at 100° C. for 10 hours to obtain porous lithium iron silicate / carbon.
[0031] figure 1 For the XRD spectrum of the obtained lithium ferrous silicate, all the diffraction peaks can correspond to the characteristic peaks of lithium ferrous silicate, and no diffraction peaks of impurities are observed. figure 2 It is a scanning electron...
Embodiment 2
[0034] Mix and dissolve 3.7g of lithium carbonate, 9g of ferrous nitrate and 11.2mL of ethyl orthosilicate in 100mL of water, then add 15g of sodium polystyrene sulfonate-ethylenediaminetetraacetic acid and 2g of acetylene black, and stir the above materials for 3 hours to mix evenly. Use hydrochloric acid to adjust the pH to 4, then ultrasonically disperse for 30 minutes, put it into a hydrothermal kettle, and react at 200°C for 24 hours under the condition of being filled with inert gas;
[0035] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then placed in a vacuum drying oven at 100°C for 10 hours in vacuum to obtain porous lithium iron silicate / carbon;
[0036] Under the protection of nitrogen, add porous lithium iron silicate / carbon into 100mL alcohol-water solution, keep the final volume ratio of alcohol and water at 10:1, stir with a mixer for 60 minutes, add an appropriate amount of ammonia water to control...
Embodiment 3
[0039]Mix 2.98g of lithium carbonate, 5.67g of ferrous oxalate, and 2.3g of silicon dioxide in 100mL of water, and then add 16g of hexadecyltrimethylammonium bromide-octadecyltrimethylammonium chloride double-template guide and 3g of glucose, mix the above substances evenly, ultrasonically disperse them for 30 minutes, put them into a hydrothermal kettle, and react at 200°C for 24 hours under the condition of being filled with inert gas;
[0040] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then placed in a vacuum drying oven at 130° C. for 10 hours in vacuum to obtain porous lithium iron silicate / carbon.
[0041] The electrochemical performance was tested according to the method of Example 1, and the first-cycle reversible capacity of the obtained positive electrode material was 131mAh / g.
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