A kind of preparation method of lithium-rich manganese-based lithium secondary battery cathode material
A lithium-rich manganese-based lithium and lithium secondary battery technology, applied in the field of lithium secondary battery material preparation, to achieve the effects of suppressing voltage decay, improving cycle stability, and increasing capacity
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Embodiment 1
[0011] According to the general chemical formula (Mn 1 Ni 0.6 co 0.3 )CO 3 1g powder of the precursor of the lithium secondary battery cathode material and 0.04744g antimony trioxide Sb 2 o 3 , 0.006108g titanium dioxide Ti 2 o 3 and 0.4261g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 350r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 880°C at a rate of 1°C / min ℃, heat preservation for 15 hours, and naturally cooled to room temperature to obtain a positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material.
[0012] The X-ray diffractometer results of the positive electrode material prepared by the above method are as follows: figure 1 As shown in the figure, it can be seen that the material conforms to the crystal peak of lithium-rich materials, which conforms to α~NaFeO 2 stru...
Embodiment 2
[0016] According to the general chemical formula (Mn 1 Ni 0.7 co 0.2 )CO 3 1g powder and 0.03668g diyttrium trioxide Y 2 o 3 , 0.013847g lanthanum trioxide La 2 o 3 and 0.4293g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 250r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 900°C at a rate of 1°C / min ℃, keep warm for 15h, and cool down to room temperature naturally. That is, the positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material is obtained. According to the battery test conditions of Example 1, the first cycle efficiency of the battery of the material of this example is 80%, the capacity retention rate after 100 cycles is 89%, and the average voltage retention rate is 95%.
Embodiment 3
[0018] According to the general chemical formula (Mn 1 Ni 0.8 co 0.1 )CO 3 The precursor of the lithium secondary battery positive electrode material and 0.00702g lanthanum trioxide La 2 o 3 , 0.0058735g scandium trioxide Sc 2 o 3 and 0.4932g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 500r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 880°C at a rate of 1°C / min ℃, keep warm for 15h, and cool down to room temperature naturally. That is, the positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material is obtained. According to the battery test conditions of Example 1, the first cycle efficiency of the battery of the material of this example is 85%, the capacity retention rate after 100 cycles is 91%, and the average voltage retention rate is 95%.
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