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A positive electrode material and positive electrode technology, applied in the field of batteries, can solve the problem that the quaternary positive electrode material needs to be improved, etc.
Active Publication Date: 2022-06-21
SVOLT ENERGY TECHNOLOGY CO LTD
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Problems solved by technology
[0003] However, the current quaternary cathode materials, cathodes, and batteries still need to be improved
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Embodiment 1
[0035] Embodiment 1, preparation quaternary cathode material A
[0036] (1) The high nickel precursor Ni 0.88 co 0.06 mn 0.03 Al 0.03 (OH) 2 , Li source (LiOH) and Zr source (Zr(OH) 4 ) are mixed to form a mixture; and calcined, cooled, pulverized, and sieved to obtain a Zr-doped quaternary positive electrode material matrix; in the Zr-doped quaternary positive electrode material matrix, the mass fraction of Zr is 3000ppm;
[0037] (2) Al source (Al 2 o 3 ) coating and boron source (H 3 BO 3 ) coating, and after calcination treatment, etc., to obtain the final quaternary cathode material A.
Embodiment 2
[0038] Embodiment 2, preparation quaternary cathode material B
[0039] (1) The high nickel precursor Ni 0.88 co 0.06 mn 0.03 Al 0.03 (OH) 2 , Li source (LiOH) and Al source (Al 2 o 3 ) are mixed to form a mixture; and calcined, cooled, pulverized, and sieved to obtain an Al-doped quaternary positive electrode material matrix; in the Al-doped quaternary positive electrode material matrix, the mass fraction of Al is 3000ppm;
[0040] (2) Al source (Al 2 o 3 ) coating and boron source (H 3 BO 3 ) coating, and after calcination treatment, etc., to obtain the final quaternary cathode material B.
Embodiment 3
[0041] Embodiment 3, preparation quaternary cathode material C
[0042] (1) The high nickel precursor Ni 0.88 co 0.06 mn 0.03 Al 0.03 (OH) 2 , Li source (LiOH), Al source (Al 2 o 3 ) and Zr source (Zr(OH) 4 ) are mixed to form a mixture; and calcined, cooled, pulverized, and sieved to obtain a quaternary positive electrode material matrix co-doped with Al and Zr; in the quaternary positive electrode material matrix co-doped with Al and Zr, the mass of Al The fraction is 3000ppm, and the mass fraction of Zr is 1500ppm;
[0043] (2) Al source (Al 2 o 3 ) coating and boron source (H 3 BO 3 ) coating, and after calcination treatment, etc., to obtain the final quaternary cathode material C.
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Abstract
The invention discloses a quaternary cathode material, an anode and a battery. Specifically, the present invention proposes a quaternary positive electrode material, the general chemical structure formula of the quaternary positive electrode material is: Li x Ni a co b mn c al d m y o 2 , where, 1≤x≤1.05, 0<y≤0.025, 0.3≤a≤0.95, 0.03≤b≤0.1, 0.01≤c≤0.05, 0.01≤d≤0.05, and a+b+c+d=1; M is a dopant, and M includes one or more selected from Zr, Al, B, Ti, Mg, Nb, Ba, Si, P, W, Sr, F; the quaternary positive electrode material has α-NaFeO 2 type crystal structure, the space group of the X-ray diffraction pattern of the quaternary cathode material is R-3m, and the relationship between the unit cell parameter c on the c-axis and the unit cell parameter a on the a-axis satisfies: c / a>4.943. Thus, the dopant can better improve the structural stability of the quaternary positive electrode material, and the quaternary positive electrode material has a better layered crystal structure, which can improve the cycle stability of the battery using the quaternary positive electrode material And thermal stability, improve the battery specific capacity and cycle life of the battery.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular, to quaternary cathode materials, cathodes, and batteries. Background technique [0002] At present, lithium-ion batteries are widely used in cameras, mobile phones, notebook computers, electric vehicles and other equipment due to their advantages such as stable voltage, high specific capacity, high energy density, long cycle life, and environmental friendliness. Among them, the key factor that determines its performance is the positive electrode material of lithium-ion batteries. In high-energy lithium-ion secondary batteries, the cathode materials used include spinel-structured LiMn 2 o 4 , layered LiCoO 2 and LiNiO 2 Wait. Among them, the layered LiNiO 2 Lithium-ion secondary batteries as cathode materials have attracted much attention due to their high charge-discharge specific capacity. However, LiNiO 2 In the process of repeated delithiation (that is, repeated chargi...
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