A method for preparing lithium cobalt phosphate composite positive electrode material with particle size controllable for lithium batteries
A composite positive electrode material, lithium cobalt phosphate technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the difficult to achieve effective control of lithium cobalt phosphate particle size and distribution, conductivity and cycle of lithium cobalt phosphate materials Poor stability, poor particle size distribution and other problems, to achieve the effect of improving cycle stability, improving ionic conductivity and electronic conductivity, and improving conductivity
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Embodiment 1
[0035] (1) Mix ammonia water, ethanol, and deionized water according to a certain volume ratio, stir magnetically for 48 minutes, then add ethyl orthosilicate, heat and stir for reaction, cool to room temperature after the reaction is completed, and wash repeatedly with ethanol and deionized water , vacuum-dried at 56°C for 11 h to obtain SiO with controllable particle size and distribution 2 Particles; the parts by volume of each raw material are 0.8 parts by volume of ammonia water, 78.8 parts by volume of ethanol, 17 parts by volume of deionized water, and 3.4 parts by volume of tetraethyl orthosilicate; the reaction temperature is 60°C, and the time is 3 hours;
[0036] (2) Heat deionized water to 78°C, gradually add urea-formaldehyde resin and glucose under stirring until both are no longer dissolved, and filter to remove the undissolved part to obtain a mixed saturated solution;
[0037] (3) SiO 2 Add the particles into the mixed saturated solution, stir and disperse fo...
Embodiment 2
[0042] (1) Mix ammonia water, ethanol, and deionized water according to a certain volume ratio, stir magnetically for 45 minutes, then add ethyl orthosilicate, heat and stir for reaction, cool to room temperature after the reaction is completed, and wash repeatedly with ethanol and deionized water , vacuum-dried at 52°C for 11 h to obtain SiO with controllable particle size and distribution 2 Particles; the parts by volume of each raw material are 0.7 parts by volume of ammonia water, 80.1 parts by volume of ethanol, 16 parts by volume of deionized water, and 3.2 parts by volume of tetraethyl orthosilicate; the reaction temperature is 55°C, and the time is 3h;
[0043] (2) Heat deionized water to 75°C, gradually add urea-formaldehyde resin and glucose under stirring until both are no longer dissolved, and filter to remove the undissolved part to obtain a mixed saturated solution;
[0044] (3) SiO 2 Add the particles into the mixed saturated solution, stir and disperse for 22 ...
Embodiment 3
[0049] (1) Mix ammonia water, ethanol, and deionized water according to a certain volume ratio, stir magnetically for 55 minutes, then add ethyl orthosilicate, heat and stir for reaction, cool to room temperature after the reaction is completed, and wash repeatedly with ethanol and deionized water , vacuum-dried at 58°C for 9 hours to obtain SiO with controllable particle size and distribution 2 Particles; the parts by volume of each raw material are 0.9 parts by volume of ammonia water, 76.4 parts by volume of ethanol, 19 parts by volume of deionized water, and 3.7 parts by volume of tetraethyl orthosilicate; the reaction temperature is 58°C, and the time is 2h;
[0050] (2) Heat deionized water to 85°C, gradually add urea-formaldehyde resin and glucose under stirring until both are no longer dissolved, and filter to remove the undissolved part to obtain a mixed saturated solution;
[0051] (3) SiO 2 Add the particles into the mixed saturated solution, stir and disperse for ...
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