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Quaternary positive electrode material, positive electrode and battery

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, and achieve the effects of improving intrinsic electronic conductivity, improving structural stability and long cycle life

Active Publication Date: 2020-07-21
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current quaternary cathode materials, cathodes, and batteries still need to be improved

Method used

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  • Quaternary positive electrode material, positive electrode and battery
  • Quaternary positive electrode material, positive electrode and battery

Examples

Experimental program
Comparison scheme
Effect test

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 positive electrode material, a positive electrode and a battery. Specifically, the invention provides a quaternary positive electrode material. The chemical structural general formula of the quaternary positive electrode material is shown in the specification, wherein x is larger than or equal to 1 and smaller than or equal to 1.05, y is larger than 0 and smaller than or equal to 0.025, a is larger than or equal to 0.3 and smaller than or equal to 0.95, b is larger than or equal to 0.03 and smaller than or equal to 0.1, c is larger than or equal to 0.01 andsmaller than or equal to 0.05, d is larger than or equal to 0.01 and smaller than or equal to 0.05, and a+b+c+d=1; M is a doping agent and comprises one or more of Zr, Al, B, Ti, Mg, Nb, Ba, Si, P, W, Sr and F; the quaternary positive electrode material has an [alpha]-NaFeO2 type crystal structure, the space group of an X-ray diffraction pattern of the quaternary positive electrode material is R-3m, and the relationship between the cell parameter c of the c axis and the cell parameter a of the a axis meets the condition that c / a is greater than 4.943. Therefore, the dopant can better improvethe structural stability of the quaternary positive electrode material, and the quaternary positive electrode material has a better layered crystal structure, so that the cycling stability and the thermal stability of a battery using the quaternary positive electrode material can be improved, the battery specific capacity of the battery is improved, and the cycle life of the battery is prolonged.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/505H01M4/525H01M4/131H01M10/0525H01M2004/028Y02E60/10H01M4/366H01M4/62H01M10/052C01G53/42C01P2002/52C01P2002/76C01P2002/77C01P2002/74C01P2004/84C01G53/50C01P2002/54C01P2006/40
Inventor 白艳张树涛潘海龙王壮
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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