Cobalt-free positive electrode material and application thereof
A positive electrode material and crystallite size technology, applied in the field of cobalt-free lithium-ion batteries, can solve the problems of practical application limitations, potential safety hazards, large gas production, etc., achieve good sphericity and roundness, small expansion coefficient, The effect of structural stability
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[0055] In one embodiment, the present invention provides a method for preparing a cobalt-free positive electrode material, the preparation method comprising:
[0056] (1) The precursor Ni x mn y (OH) 2 , lithium salt, and dopant were dry-mixed at a speed of 3000r / min for 20min, and the dry-mixed material was sintered once at 800-1000°C for 10h under an oxygen atmosphere to obtain a one-sintered material of the positive electrode material ;
[0057] Among them, the precursor Ni x mn y (OH) 2 Among them, 0.52 or WO 3 ; The precursor Ni x mn y (OH) 2 The molar ratio with lithium salt is 1:1.02~1:1.15; The dopant and precursor Ni x mn y (OH) 2 The mass ratio is 0.003:1;
[0058] (2) Al 2 o 3 and step (1) The first-calcined material of the positive electrode material was dry mixed for 20 minutes at a mass ratio of 0.002:1 at a speed of 2000r / min; Perform secondary sintering for 5 hours to obtain the positive electrode material.
Embodiment 1
[0060] This embodiment provides a cobalt-free positive electrode material, the chemical formula of the cobalt-free positive electrode material is Li 1.05 Ni 0.75 mn 0.25 o 2 .
[0061] The crystallite sizes of different crystal orientations obtained by the following X-ray diffraction method are shown in Table 1, and the ratio of the crystallite size of the 003 peak to the crystallite size of other peaks is shown in Table 2.
[0062]Test conditions: tube pressure 40KV, tube flow 200uA, Cu target, diffraction width satisfying DS=SS=1°, RS=0.3mm, scanning speed 2d / min, scanning range 10°~100°; slit, SS is the anti-scatter slit, and RS is the receiving slit.
[0063] The preparation method of the cobalt-free positive electrode material in this embodiment is carried out based on the above-mentioned implementation method:
[0064] Among them, the precursor is Ni 0.75 mn 0.25 (OH) 2 , the lithium salt is LiOH, the molar ratio of the precursor to the lithium salt is 1:1.05, an...
Embodiment 2
[0067] This embodiment provides a cobalt-free positive electrode material, the chemical formula of the cobalt-free positive electrode material is Li 1.05 Ni 0.75 mn 0.25 o 2 .
[0068] The crystallite sizes of different crystal orientations obtained by the following X-ray diffraction method are shown in Table 1, and the ratio of the crystallite size of the 003 peak to the crystallite size of other peaks is shown in Table 2.
[0069] The test method of this embodiment is consistent with that of Example 1.
[0070] The preparation method of the cobalt-free positive electrode material in this embodiment is carried out based on the above-mentioned implementation method:
[0071] Among them, the precursor is Ni 0.75 mn 0.25 (OH) 2 , the lithium salt is LiOH, the molar ratio of the precursor to the lithium salt is 1:1.05, and the dopant is ZrO 2 , The first firing temperature is 880°C.
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Abstract
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