Boron-doped nickel-cobalt-manganese positive electrode material and preparation method thereof
A cathode material, nickel-cobalt-manganese technology, used in battery electrodes, structural parts, electrical components, etc., to improve high-temperature cycle stability, reduce cation mixing, and reduce residual lithium content.
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Embodiment 1
[0035] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is Li 1.00 Ni 0.845 Co 0.07 Mn 0.05 Mg 0.01 Sn 0.005 B 0.0 2 O 2.00 , the secondary particle size is D10=9.15 μm, D50=13.04 μm, D90=15.40 μm, and the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. According to the Scherrer formula: D=Kγ / Bcosθ (K is the Scherrer constant, take K=0.89, γ is the X-ray wavelength=0.15418nm, B is the width of the half-peak width of the crystallite size, θ is the Bragg angle), using XRD The boron-doped positive electrode material was analyzed, and the crystallite size D=52.4 nm was calculated using the Scherrer formula according to the analysis result (the peak of the 104 crystal plane).
[0036] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:
[0037] (1) The high nickel cathode material precursor Ni 0.88 Co 0.07 Mn 0...
Embodiment 2
[0041] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is Li 1.00 Ni 0.867 Co 0.05 Mn 0.05 Al 0.01 Sn 0.003 B 0.0 2 O 2.00 , the secondary particle size D10=10.32 μm, D50=13.56 μm, D90=16.41 μm, the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. Its crystallite size is calculated by the Scherrer formula to obtain D=54.6nm.
[0042] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:
[0043] (1) The high nickel cathode material precursor Ni 0.90 Co 0.05 Mn 0.05 (OH) 2 , LiOH·H 2 O, AlB 2 , SnO 2 Put into a high-speed mixer for mixing at a molar ratio of 1:1.03:0.01:0.003, the rotation speed is 1500rpm / min, and after high-speed mixing for 30min, a mixed material is obtained, and the mixed material is placed in a sintering furnace. The temperature was raised to 500°C at a heating rate of 1 / min, kept si...
Embodiment 3
[0047] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is Li 1.00 Ni 0.848 Co 0.06 Mn 0.06 Mg 0.01 Mo 0.002 B 0.0 2 O 2.00 , the secondary particle size D10=9.92 μm, D50=13.32 μm, D90=15.22 μm, the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. Its crystallite size is calculated by the Scherrer formula to obtain D=62.6nm.
[0048] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:
[0049] (1) The high nickel cathode material precursor Ni 0.88 Co 0.06 Mn 0.06 (OH) 2 , LiOH·H 2 O, MgB 2 , MoO 3 Put into a high-speed mixer for mixing at a molar ratio of 1:1.06:0.01:0.002, the speed is 1500rpm / min, and after high-speed mixing for 30min, a mixed material is obtained, and the mixed material is placed in a sintering furnace. The temperature was raised to 500°C at a heating rate of 1 / min, kept sintered for...
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