Cobalt-free positive electrode material and preparation method thereof, lithium ion battery positive electrode and lithium battery
A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of inability to improve the conductivity of cobalt-free single crystal positive electrode materials, easy agglomeration, poor coating uniformity, etc. Coating effect, improved particle dispersibility, improved conductivity
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[0054] The second aspect of the present invention provides a method for preparing a cobalt-free positive electrode material, wherein the method includes:
[0055] (1) react after mixing the lithium salt and the precursor to obtain a cobalt-free positive electrode material; wherein, the chemical formula of the precursor is Ni x mn y (OH) 2 , 0.55≤x≤0.95, 0.05≤y≤0.45;
[0056] (2) roasting after mixing the cobalt-free positive electrode material, coating agent and conductive substance;
[0057] (3) Pulverizing the material after step (2) to obtain a cobalt-free positive electrode material.
[0058] According to the present invention, in step (1), the conditions of the reaction include: the temperature is 800-1000°C, and the time is 10-20h; preferably, the temperature is 900-1000°C, and the time is 10-15h.
[0059] According to the present invention, in step (2), the condition of described roasting comprises: 2 Under the atmosphere, the temperature is 300-700°C, and the time...
Embodiment 1
[0080] This example is to illustrate the cobalt-free cathode material prepared by the method of the present invention.
[0081] (1) 48gLiOH and 100g precursor Ni x mn y (OH) 2 , x is 0.75, y is 0.25, mixed in a high-speed mixer at a stirring rate of 950rpm, and then reacted at a high temperature of 950°C for 10h to synthesize a cobalt-free cathode material;
[0082] (2) Cobalt-free positive electrode material 105g, coating agent (specifically Al 2 o 3 )0.25g, the specific surface area is 200m 2 0.35g of conductive carbon black per g is mixed in a high-speed mixer at a stirring rate of 1000rpm, and the mixed material is mixed at 400 ° C, N 2 Heat treatment under the atmosphere, the time is 5h; wherein, based on the total weight of the precursor, the amount of the lithium salt is 48% by weight, the amount of the conductive substance is 0.35% by weight, and the amount of the cobalt-free positive electrode material The consumption is 105% by weight, and the consumption of th...
Embodiment 2
[0086] This example is to illustrate the cobalt-free cathode material prepared by the method of the present invention.
[0087] (1) 47LiOH and 100g precursor Ni x mn y (OH) 2 , x is 0.55, y is 0.45, mixed in a high-speed mixer at a stirring rate of 900rpm, and then reacted at a high temperature of 980°C for 12h to synthesize a cobalt-free cathode material;
[0088] (2) Cobalt-free positive electrode material 106g, coating agent (specifically ZrO 2 )0.30g, specific surface area is 120m 2 0.40g of conductive carbon black per g is mixed in a high-speed mixer at a stirring rate of 980rpm, and the mixed material is mixed at 500 ° C, N 2 Heat treatment under the atmosphere, the time is 6h; wherein, based on the total weight of the precursor, the amount of the lithium salt is 47% by weight, the amount of the conductive substance is 0.40% by weight, and the amount of the cobalt-free positive electrode material The consumption is 106% by weight, and the consumption of the coating ...
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