Method for preparing high-temperature lithium manganate material for lithium ion power battery
A power battery, lithium manganate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid material capacity decay, material performance deterioration, poor cycle stability, etc., to achieve outstanding high temperature performance, improve uniformity performance, reliability, and comprehensive performance
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[0031] Example 1
[0032] Prepare the following aqueous solutions for use: 1.5mol / L (mol / L) manganese sulfate solution, 0.5mol / L magnesium nitrate (dopant) solution, 2mol / L sodium hydroxide solution, add 100dm per cubic meter of sodium hydroxide solution 3 Concentrated ammonia. At 5m 3 Inject 200dm into the stirred thermostatic titanium-lined reactor 3 Pure water, start stirring, set the reaction temperature to 10°C, use real-time pH automatic control device to control the injection of sodium hydroxide (ammonia-containing water), and control the pH range of the system between 11-12. Use a metering pump to inject the manganese sulfate and magnesium sulfate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 20dm 3 ·Min -1 And 1.54dm 3 ·Min -1 , Stop injection after 1.5h. The reaction was continued for 1 hour and then the material was discharged. Use a filter press to filter, fully press dry and wash the precipitate with pure water 10 t...
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[0034] Example 2
[0035] Prepare the following aqueous solutions for use: 4mol / L manganese chloride solution, 2mol / L cobalt sulfate (dopant) solution, 5mol / L potassium hydroxide solution, add 200dm per cubic meter of potassium hydroxide solution 3 Concentrated ammonia. At 5m 3 Inject 200dm into the stirred thermostatic titanium-lined reactor 3 Pure water, 50dm 3 Concentrated ammonia water, start stirring, set the reaction temperature to 35°C, use real-time pH automatic control device to control the injection of potassium hydroxide (ammonia water), and control the pH range of the system to be between 8-11. Use a metering pump to inject the manganese chloride and cobalt sulfate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 20dm 3 ·Min -1 And 2dm 3 ·Min -1 , Stop injection after 1.5h. The reaction was continued for 3 hours and the material was discharged. Use a filter press to filter, fully press dry and wash the precipitate with ...
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[0037] Example 3
[0038] Prepare the following aqueous solutions for use: 0.5mol / L manganese nitrate solution, 0.1mol / L nickel sulfate (dopant) solution, 1mol / L sodium carbonate solution. At 0.1m 3 Inject 10dm into the stirred thermostat PTFE lined reactor 3 Pure water, 0.5dm 3 Concentrated ammonia, start stirring, and set the reaction temperature to 52°C. Use a metering pump to inject manganese nitrate, nickel sulfate and sodium carbonate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 1dm 3 ·Min -1 , 0.02dm 3 ·Min -1 And 1.2dm 3 ·Min -1 , Stop injection after 0.5h. The reaction was continued for 0.5h and then the material was discharged. Use a centrifugal washing machine to filter and wash, and the solids are air-dried at 140°C for 12 hours. Determine the manganese content of the powder, stir and disperse the powder obtained in the previous step with an appropriate amount of benzene in the reactor, and add the coating agent al...
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