Method for preparing spherical lithium manganate
A spherical lithium manganate and oxalic acid technology, applied in chemical instruments and methods, lithium compounds, electrode manufacturing, etc., can solve the problems of poor sphericity and particle size distribution of reaction products, poor reaction process stability, and difficult to guarantee product morphology. , to achieve the effect of improving specific capacity and high temperature cycle performance, good morphology and good sphericity
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Embodiment 1
[0033] Prepare 1 mol / L manganese nitrate aqueous solution, 2 mol / L oxalic acid aqueous solution, and 2 mol / L ethylenediamine aqueous solution. The three solutions were continuously pumped with a plunger pump at the same speed of 6ml / min into a 10 liter stirred reactor pre-filled with 3 liters of deionized water, and the reaction temperature was controlled to 70°C under continuous stirring. After 3 hours of reaction, the solid-liquid mixture in the reactor began to overflow naturally. After 10 hours, the liquid was stopped and the stirring was continued for 1 hour. The solid-liquid mixture obtained from the reaction was collected for solid-liquid separation, and the solid obtained was washed with deionized water , And then dried to obtain spherical manganese oxalate precursor.
[0034] Weigh 200 grams of lithium carbonate and put it in a ball mill, add 600 ml of ethanol to it, and ball mill for 2 hours to obtain a paste. The paste was completely transferred to a beaker with a volum...
Embodiment 2
[0037] Prepare 3 mol / L manganese sulfate aqueous solution, 1 mol / L sodium oxalate aqueous solution, and 1.5 mol / L ethylenediamine aqueous solution. The three solutions were continuously pumped with a plunger pump into a 12-liter stirred reactor pre-filled with 3 liters of deionized water, and the pumping speeds were: manganese sulfate solution 2ml / min, sodium oxalate solution 10ml / min, ethylenediamine solution 10ml / min, continuous stirring, control the reaction temperature to 60℃, after about 4 hours of reaction, the solid-liquid mixture in the reactor begins to overflow naturally, stop feeding after 10 hours, continue to stir and settle For 1 hour, the solid-liquid mixture obtained from the reaction was collected, and solid-liquid separation was performed. The obtained solid was washed with deionized water and then dried to obtain a spherical manganese oxalate precursor.
[0038] Weigh 200 grams of lithium hydroxide and put it into a ball mill, add 700 ml of ethanol to it, and ba...
Embodiment 3
[0041] A mixed aqueous solution containing 0.8 mol / L of manganese chloride and 1 mol / L of acetic acid is prepared, and a 2.5 mol / L of ammonium oxalate aqueous solution is prepared. The two solutions were continuously pumped with a plunger pump into a stirred reactor with a volume of 10 liters pre-filled with 3 liters of deionized water, and the pumping speeds were: manganese chloride / acetic acid mixed solution 7.5ml / Min, 5ml / min of ammonium oxalate solution, stirring continuously, controlling the reaction temperature to 55℃, after about 5 hours of reaction, the solid-liquid mixture in the reactor began to overflow naturally, after 10 hours, stop the liquid feeding, continue to stir and settle for 1 hour, The solid-liquid mixture obtained from the reaction is collected, solid-liquid separation is performed, and the obtained solid is washed with deionized water and then dried to obtain a spherical manganese oxalate precursor.
[0042] Weigh 200 grams of lithium hydroxide into a bal...
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Abstract
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