Core-shell structure lithium manganate and preparation method thereof
A technology of structural lithium manganate and lithium manganate, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as short battery cycle life, achieve the effect of enhancing cycle stability, improving performance, and solving serious capacity attenuation
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Embodiment 1
[0031] 1) Take commercial manganese carbonate and lithium carbonate at a molar ratio of 4:1, put them into an acetic acid solution with a volume concentration of 50%, emulsify with an ultrasonic emulsifier to form a homogeneous emulsion, and dry in a dryer at 95°C;
[0032] 2) In an open high-temperature furnace, raise the temperature to 550°C at a rate of 5°C / min and keep it warm for 3 hours;
[0033] 3) Then use a fan to blow air into the high-temperature furnace, raise the temperature to 700°C at a rate of 5°C / min and hold it for 3 hours for sintering;
[0034] 4) Gradually lower the temperature to 550°C at a cooling rate of 5°C / min, and keep the fan blowing air into the high-temperature furnace during the cooling process;
[0035] 5) When the furnace temperature drops to 550°C, stop feeding air into the high-temperature furnace, and no longer control the cooling rate at this time, and naturally cool to room temperature to obtain a spinel-type lithium manganate material;
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Embodiment 2
[0049] 1) Take commercial manganese carbonate and lithium carbonate at a molar ratio of 3.8:1, put them into an acetic acid solution with a volume concentration of 40%, emulsify with an ultrasonic emulsifier to form a homogeneous emulsion, and dry in a dryer at 95°C;
[0050] 2) In an open high-temperature furnace, raise the temperature to 560°C at a rate of 5°C / min and keep it warm for 3 hours;
[0051] 3) Then use a fan to blow air into the high-temperature furnace, raise the temperature to 710°C at a rate of 5°C / min and hold it for 3 hours for sintering;
[0052] 4) Gradually lower the temperature to 560°C at a cooling rate of 5°C / min, and keep the fan blowing air into the high-temperature furnace during the cooling process;
[0053] 5) When the furnace temperature drops to 560°C, stop feeding air into the high-temperature furnace, and no longer control the cooling rate at this time, and naturally cool to room temperature to obtain a spinel-type lithium manganate material; ...
Embodiment 3
[0058] 1) Take commercial manganese carbonate and lithium carbonate at a molar ratio of 4.2:1, put them into an acetic acid solution with a volume concentration of 60%, emulsify with an ultrasonic emulsifier to form a homogeneous emulsion, and dry in a dryer at 95°C;
[0059] 2) In an open high-temperature furnace, raise the temperature to 540°C at a rate of 5°C / min and keep it warm for 3 hours;
[0060] 3) Then use a fan to blow air into the high-temperature furnace, raise the temperature to 690°C at a rate of 5°C / min and hold it for 3 hours for sintering;
[0061] 4) Gradually lower the temperature to 540°C at a cooling rate of 5°C / min, and keep the fan blowing air into the high-temperature furnace during the cooling process;
[0062] 5) When the furnace temperature drops to 540°C, stop feeding air into the high-temperature furnace, and no longer control the cooling rate at this time, and naturally cool to room temperature to obtain a spinel-type lithium manganate material; ...
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