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Positive electrode active material, preparation method thereof, positive electrode sheet and lithium ion secondary battery

A technology of positive active material and active material, which is applied in the field of positive active material, its preparation method, positive pole piece and lithium ion secondary battery, and can solve the problem of capacity reduction, sacrifice of lithium ion secondary battery capacity and energy density, and lithium ion secondary battery. The low safety performance of the secondary battery and other issues, to achieve the effect of increasing capacity

Active Publication Date: 2020-01-24
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the cycle performance and safety performance of the lithium-ion secondary battery have been improved to a certain extent by doping and modifying the positive electrode active material, and the surface coating has been modified, but the effect is general. , its capacity decreases rapidly, especially at high temperatures, and the safety performance of lithium-ion secondary batteries at high temperatures is still low
In particular, the doping modification and surface coating modification of the positive active material will also sacrifice the capacity and energy density of the lithium-ion secondary battery.

Method used

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  • Positive electrode active material, preparation method thereof, positive electrode sheet and lithium ion secondary battery
  • Positive electrode active material, preparation method thereof, positive electrode sheet and lithium ion secondary battery
  • Positive electrode active material, preparation method thereof, positive electrode sheet and lithium ion secondary battery

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preparation example Construction

[0039] Preparation method of positive electrode active material

[0040] In order to realize the above-mentioned positive electrode active material, the second aspect of the embodiment of the present invention provides a preparation method of the positive electrode active material. Methods include:

[0041] Step S10 , mixing transition metal source and lithium source and performing sintering treatment to obtain active material matrix particles.

[0042] The transition metal source is one or more of oxides and hydroxides containing transition metals. For example, for the positive electrode active material represented by the aforementioned formula (1), the transition metal source can be one or more of composite oxides and composite hydroxides containing Ni, Co and Mn, such as [Ni x co y mn z ](OH) 2 .

[0043] [Ni x co y mn z ](OH) 2 It can be obtained by methods known in the art. As an example, the Ni source, the Co source and the Mn source are dispersed in the sol...

Embodiment 1

[0096] Preparation of positive electrode active material:

[0097] Step S1, the transition metal source [Ni 0.8 co 0.1 mn 0.1 ](OH) 2. The source of element A, zirconia, and lithium hydroxide, a source of lithium, are added to a high-speed mixer for mixing. The mixing time is 1 hour, wherein the molar ratio Li / Me of lithium hydroxide to the transition metal source is 1.05, and the source of element A, zirconia The amount of addition meets the content of A element Zr in the positive electrode active material is 1000ppm; put the mixed material into the atmosphere sintering furnace for sintering treatment, the sintering temperature is 830 ° C, the sintering atmosphere is an oxygen atmosphere, the oxygen concentration is 90%, the sintering time 15h; get active material matrix particles.

[0098] Step S2, the active material matrix particle and the source Al of M element 2 o 3 Add it into a high-speed mixer for mixing, the mixing time is 1h, wherein the source of M element Al...

Embodiment 2

[0108] Preparation of positive electrode active material:

[0109] Step S1, the transition metal source [Ni 0.7 co 0.15 mn 0.15 ](OH) 2 1. Add magnesium oxide as the source of element A and lithium hydroxide as the source of lithium into a high-speed mixer for mixing. The mixing time is 2 hours, wherein the molar ratio Li / Me of lithium hydroxide to the source of the transition metal is 1.05, and the source of magnesium oxide as the element A is The amount of addition meets the content of A element Mg in the positive electrode active material is 3000ppm; put the mixed material into the atmosphere sintering furnace for sintering treatment, the sintering temperature is 850 ° C, the sintering atmosphere is an oxygen atmosphere, the oxygen concentration is 80%, the sintering time For 20h; to obtain active material matrix particles.

[0110] Step S2, the active material matrix particles and the source of M element AlF 3 Add it into a high-speed mixer for mixing, the mixing time...

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Abstract

The invention discloses a positive active material, a preparation method thereof, a positive pole sheet and a lithium ion secondary battery. The positive active material comprises active material bodyparticles and an N-element-containing oxide coating layer; the surfaces of the active substance body particles are doped with an M element, so that a doped layer is formed; the content of the M element ranges from 400 ppm to 3000 ppm; and the content of the M element is gradually reduced in a direction from the outer surfaces of the active substance body particles to the cores of the active substance body particles; the content of an N element in the coating layer ranges from 100 ppm to 2000 ppm; the unit volume average content of the N element in the coating layer is greater than the unit volume average content of the M element in the doped layers; and the M element and the N element are respectively and independently one or more element selected from Mg, Ca, Ce, Ti, Zr, Al, Zn and B. The positive electrode active material can improve the capacity, energy density, cycle performance and safety performance of the lithium ion secondary battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a positive electrode active material, a preparation method thereof, a positive electrode sheet and a lithium ion secondary battery. Background technique [0002] At present, lithium-ion secondary batteries are widely used in electric vehicles and electronic products due to their advantages of high voltage platform, high specific energy, no memory effect and low environmental pollution, occupying the core position of power batteries. However, the short mileage and safety hazards of new energy electric vehicles are important factors restricting its rapid development; electronic products cause inconvenience to users due to the need for frequent charging, and also cause attenuation of battery capacity and service life. With the continuous development of science and technology and the continuous improvement of people's living standards, higher requirements are also put f...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M10/0525H01M4/36C01G53/50C01P2006/40C01P2004/03Y02E60/10Y02P70/50H01M4/131H01M4/505H01M4/525H01M10/0587H01M2004/021H01M2004/028
Inventor 吴奇何金华吉长印刘良彬
Owner CONTEMPORARY AMPEREX TECH CO