Cobalt-free positive electrode material, preparation method thereof and lithium ion battery
A technology of positive electrode materials and single crystal materials, which is applied in the field of lithium-ion batteries, can solve the problems of high capacitance and poor cycle performance, and achieve the effects of high capacitance, excellent current rate performance, and reduced gas production
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[0025] As described in the background art, the existing cathode materials for lithium-ion batteries have the problem of high capacity but poor cycle performance. In order to solve the above technical problems, the present application provides a method for preparing a cobalt-free positive electrode material. The preparation method includes: performing a first sintering treatment on a lithium source material and a cobalt-free precursor to obtain a sintered product; crushing the sintered product to 1 ~2 μm to obtain a cobalt-free single crystal material; the cobalt-free single crystal material is subjected to a second sintering treatment with a boron coating agent and a carbon coating agent to obtain a cobalt-free positive electrode material.
[0026] Sintering of lithium source material and cobalt-free precursor to prepare layered cobalt-free cathode material LiNi 1-x mn x o 2 (0.45≤x≤0.55), and then by crushing it to 1-2 μm, a layered cobalt-free single crystal material can b...
Embodiment 1
[0042] Lithium hydroxide and the precursor Ni with a D50 particle size of 1.5 microns were first 1-x mn x (OH) 2 (0.45≤x≤0.55), weighed according to the molar ratio of Li / (Ni+Mn) being 1.05, and then mixed with high-speed mixing equipment, and the mixing time was 10 minutes. The speed of the 5L equipment in the laboratory is 2500rpm, and the material filling efficiency in the equipment is 50%.
[0043] React at a high temperature of 1000°C (oxygen) for 10 hours, and crush the sintered block material with a jet mill to obtain most of the single crystal particle products with a particle size of 1-2 microns.
[0044] Dry coating is used to co-coat the above single crystal particles with boron and carbon. The specific process is: add the coating agent and the single crystal particle product to a 5L mixing equipment for mixing. Mixing time: 15 minutes, speed: 2500rpm; Wherein, the boron coating agent comprises boric acid, and the carbon coating agent comprises sucrose, and is tr...
Embodiment 2
[0052] The difference from Example 1 is: the temperature of the first sintering process is 700°C, and the temperature of the second sintering process is 900°C.
[0053] The cycle capacity retention rate of the cobalt-free cathode material at 45°C for 600 cycles is 93%, and the discharge capacity is 210mAh / g.
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