Preparation method of lithium battery cathode material cobalt hydroxide
A technology of cobalt hydroxide and positive electrode materials, which is applied in the direction of cobalt oxide/cobalt hydroxide, battery electrodes, lithium batteries, etc., can solve the problems of harsh drying conditions, long production process, wide particle size distribution of cobalt hydroxide, etc., and achieve particle size distribution Narrow, good sphericity, low cost effect
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Embodiment 1
[0024] The preparation method of lithium battery cathode material cobalt hydroxide is characterized in that it comprises the following steps:
[0025] 1) Prepare crystal nucleus by hydrolysis precipitation, add cobalt isopropoxide into pure water, then add dispersant, start stirring at the same time, stirring speed is 700r / min, react at 80°C for 5 hours, and obtain cobalt hydroxide precipitate as crystal nucleus;
[0026] 2) Homogeneous precipitation, the obtained cobalt hydroxide crystal nucleus is added into pure water according to 8 times its mass to make a slurry, then the pure cobalt solution and urea are added, and the temperature is raised to 99°C at a rate of 3.5°C / h, and constant temperature reaction 6 hours, stirring speed 700r / min;
[0027] 3) Alkali washing, filter the material obtained by homogeneous precipitation, add the filtered material to 0.9mol / l sodium hydroxide solution and soak for 3 hours, the soaking temperature is 75°C, and then filter the soaked slurr...
Embodiment 2
[0036] The preparation method of lithium battery cathode material cobalt hydroxide is characterized in that it comprises the following steps:
[0037] 1) Prepare crystal nucleus by hydrolysis precipitation, add cobalt isopropoxide into pure water, then add dispersant, start stirring at the same time, stirring speed is 1100r / min, react at 85°C for 6 hours, and obtain cobalt hydroxide precipitate as crystal nucleus;
[0038] 2) Homogeneous precipitation, the obtained cobalt hydroxide crystal nucleus is added into pure water according to 5 times its mass to make a slurry, then the pure cobalt solution and urea are added, the temperature is raised to 97°C at a rate of 4°C / h, and constant temperature reaction 5 hours, stirring speed 500r / min;
[0039] 3) Alkali washing, filter the material obtained by homogeneous precipitation, add the filtered material to 2.5mol / l sodium hydroxide solution and soak for 3 hours, the soaking temperature is 78°C, and then filter the soaked slurry;
...
Embodiment 3
[0048] The preparation method of lithium battery cathode material cobalt hydroxide is characterized in that it comprises the following steps:
[0049] 1) Prepare crystal nuclei by hydrolysis and precipitation, add cobalt isopropoxide into pure water, then add dispersant, and start stirring at the same time at a stirring speed of 900r / min, and react at 65°C for 7 hours to obtain cobalt hydroxide precipitates as crystal nuclei;
[0050] 2) Homogeneous precipitation, the obtained cobalt hydroxide crystal nucleus is added into pure water according to 6 times its mass to make a slurry, then the pure cobalt solution and urea are added, and the temperature is raised to 98°C at a rate of 4°C / h, and constant temperature reaction 7 hours, stirring speed 750r / min;
[0051] 3) Alkali washing, filter the material obtained by homogeneous precipitation, add the filter material to 2mol / l sodium hydroxide solution and soak for 3.5 hours, the soaking temperature is 80°C, and then filter the soa...
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