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Monocrystal-like lithium nickel cobalt manganese composite oxide material and preparation method thereof

A nickel-cobalt-manganese oxide and composite oxide technology, which is used in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of complex process and high equipment requirements, improve material capacity, improve circulation, and simplify production processes. The effect of the process

Inactive Publication Date: 2019-09-20
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the process is complicated, and the production requires high equipment

Method used

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  • Monocrystal-like lithium nickel cobalt manganese composite oxide material and preparation method thereof
  • Monocrystal-like lithium nickel cobalt manganese composite oxide material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select Ni with a D50 of 3.3 μm 0.6 co 0.1 mn 0.3 (OH) 2 For the precursor, the precursor is mixed with lithium carbonate at a molar ratio of 1.06, and 0.007% of B element and 0.015 mole of Zr element are added. B source uses H 3 BO 3 , Zr source using ZrO 2 . Mix well in a high speed mixer. The homogeneously mixed materials were placed in a sintering furnace to raise the temperature to 910°C at a rate of 3°C / min and keep the temperature for 12h. After that, it is cooled to room temperature with the temperature of the furnace, and crushed by a crusher. The crushed material is mixed with 0.15% Al (Al source is Al 2 o 3 ) and mix evenly, raise the temperature to 700°C at a heating rate of 3°C / min in the sintering furnace and keep it warm for 6h. With the furnace temperature down to room temperature. Then sieve to get the finished material.

[0034] Mix the above-mentioned finished materials, acetylene black, KS-6, and PVDF according to the mass ratio of 9.0︰0....

Embodiment 2

[0039] Select Ni with a D50 of 2.0 μm 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, using lithium hydroxide and 0.15% Sr (Sr source is Sr(OH) 2 ), the primary sintering temperature is 750°C. Except described condition, other is identical with embodiment 1.

Embodiment 3

[0041] Select Ni with a D50 of 6.0 μm 0.5 co 0.2 mn 0.3 (OH) 2 For the precursor, use 0.1% Sr (Sr source is SrO), and the primary sintering temperature is 970° C., except for the above conditions, the others are the same as in Example 1.

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Abstract

The invention relates to a monocrystal-like lithium nickel cobalt manganese composite oxide material and a preparation method thereof. The material has a general formula of LiaNixCoyMn1-x-yMbNcO2.ZdO2, wherein 1.0<=a<=1.1, 0.5<=x<=0.9, 0.1<=y<=0.2, 0.001<=c<=0.03, the mass ratio of Z to LiaNixCoyMn1-x-yMbNcO2.ZdO2 is that 0.05%<=d<=0.35%, and the mass ratio of M to LiaNixCoyMn1-x-yMbNcO2.ZdO2 is that 0.007% <= b <= 0.35%. The method does not use a physical grinding method, and adds an additive during the primary mixing as a sintering fluxing agent to lower the sintering temperature, simplify the production process, and enable a precursor to be fired into a monocrystal shape. The addition of the fluxing agent reduces the internal stress of the crystal, which contributes to lithium ion intercalation and de-intercalation and increases the material capacity.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium ion batteries, in particular to a single-crystal lithium-nickel-cobalt-manganese composite oxide material and a preparation method for the material. Background technique [0002] Ternary cathode materials have become the mainstream choice for electric vehicles due to their advantages of high energy density, good cycle, and light weight in electric vehicles. [0003] Most of the ternary materials currently on the market are secondary spherical particles with a diameter of 7 μm or more. The spheres are easily broken when the coating is rolled, resulting in the exposure of uncoated internal particles, which in turn affects the cycle performance and high-temperature storage performance of the battery. Secondly, the long-term contraction and expansion of the primary particles in the cycle of the secondary spherical particles leads to ball cracking, which also affects the cycle performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 左高峰栗晓静徐云军程迪陈丹凤
Owner HENAN KELONG NEW ENERGY CO LTD
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