Preparation method of high-multiplying-power lithium iron silicate positive electrode material
A technology for lithium iron silicate and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of porous lithium iron silicate materials that have not been reported publicly, achieve small particle size, reduce production costs, and improve active effect
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Embodiment 1
[0030] Dissolve 0.02mol of lithium hydroxide in 20mL of water, add acetic acid to adjust the pH to 7, dissolve 0.01mol of ferric nitrate and 0.01mol of ethyl orthosilicate in 20mL of ethanol, add dropwise into the lithium salt solution, and continue stirring for 1 hour A sol was formed, 2.5 mL of ethylenediamine was added, stirring was continued to form a gel, and stirring was continued for 30 minutes to form a uniform yellow gel. Transfer to a 100mL hydrothermal kettle, keep warm at 180°C for 24 hours and cool naturally, the yellow gel turns dark green. Grinding and stirring the gel at 80°C to volatilize the excess solvent to obtain a xerogel. Grind the xerogel to obtain the precursor powder, place the precursor powder in a tube furnace, feed Ar gas as a protective gas, and add (0.125g L -1 ) ethanol vapor as a carbon source for in-situ carbon coating, the sintering temperature is 600°C, the sintering time is 10h, naturally cooled to room temperature, ground and sieved to ob...
Embodiment 2
[0034] Dissolve 0.02mol of lithium hydroxide in 20mL of water, add acetic acid to adjust the pH to 7, dissolve 0.01mol of ferric nitrate and 0.01mol of ethyl orthosilicate in 20mL of ethanol, add dropwise into the lithium salt solution, and continue stirring for 1 hour To form a sol, add 2.5mL of ethylenediamine, continue to stir to form a gel, continue to stir for 30 minutes to form a yellow uniform gel, grind and stir the gel at 80°C to evaporate excess solvent to obtain a yellow xerogel. Grind the xerogel to obtain the precursor powder, place the precursor powder in a tube furnace, feed Ar gas as a protective gas, and add (0.125g L -1 ) ethanol vapor as a carbon source for in-situ carbon coating, the sintering temperature is 600°C, the sintering time is 10h, naturally cooled to room temperature, ground and sieved to obtain the lithium iron silicate cathode material. The material has a discharge capacity of 161.6mAh g at 0.1C, 0.2C, 0.5C, 1C and 5C rates -1 , 152.1mAh·g -1...
Embodiment 3
[0036] Dissolve 0.02mol of lithium hydroxide in 20mL of water, add citric acid to adjust the pH value to 7, dissolve 0.01mol of ferric nitrate and 0.01mol of ethyl orthosilicate in 20mL of ethanol, add dropwise to the lithium salt solution, and keep stirring for 1 A sol was formed within 1 hour, and 2.5 mL of ethylenediamine was added, and the mixture was continuously stirred to form a gel, and continued to stir for 30 minutes to form a yellow uniform gel. Transfer to a 100mL hydrothermal kettle, keep warm at 180°C for 24 hours and cool naturally, the yellow gel turns dark brown. Grinding and stirring the gel at 80°C to volatilize the excess solvent to obtain a xerogel. Grind the dry gel to obtain the precursor powder, place the precursor powder in a tube furnace, pass in Ar gas as a protective gas, sinter at 600°C, and sinter for 10 hours, cool naturally to room temperature, grind and sieve to obtain silicic acid Lithium iron cathode material. The material has a discharge c...
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