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Modified NCMA quaternary positive electrode material and preparation method thereof

A cathode material and modification technology, which is applied in the field of modified NCMA quaternary cathode materials and its preparation, can solve the problems of many times of mixing, small amount of potting, and low efficiency of sintering process

Inactive Publication Date: 2021-09-14
HUNAN CHANGYUAN LICO CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For NCMA polycrystalline materials, if the secondary particle size is large, the cycle stability is better, but the capacity and rate performance will be poor; if the secondary particle size is small, although the capacity and rate performance of the material can be improved to a certain extent. Rate performance, but there is also the problem of poor cycle stability
On the other hand, if the two cathode materials are prepared separately and then graded, the process involved in the large-scale production process is cumbersome, the number of mixing times is high, and the utilization of the sintering kiln is low.
In addition, due to the low bulk density of the small particle precursor, the filling volume is small, resulting in low efficiency and high cost of the sintering process

Method used

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  • Modified NCMA quaternary positive electrode material and preparation method thereof
  • Modified NCMA quaternary positive electrode material and preparation method thereof
  • Modified NCMA quaternary positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] Preparation of NCMA quaternary cathode material:

[0038] Step 1, high-nickel polycrystalline Ni with Dv50 of 11.5 μm 0.90 co 0.05 mn 0.04 Al 0.01 (OH) 2 Precursor, ethyl orthosilicate Si(OC 2 h 5 ) 4 Mix according to the molar ratio of 1.0:0.03, add to the mixed solution of absolute ethanol and deionized water to dissolve, and obtain the mixed solution A. The mass ratio of deionized water to precursor is 2:5; the volume ratio of deionized water to ethanol is 2:50.

[0039] Step 2, the mixture A was stirred at 50 °C for 5 h, and then continued to stir at 80 °C until the solution was completely evaporated to obtain large particles of Ni 0.90 co 0.05 mn 0.04 Al 0.01 (OH) 2 @SiO 2 Precursor, coded as Lp.

[0040] Step 3, high-nickel polycrystalline Ni with Dv50 of 3.5 μm 0.90 co 0.05 mn 0.04 Al 0.01 (OH) 2 The precursor was added to deionized water to prepare slurry B, the weight ratio of precursor to deionized water was 1:5; 2 mol / L Na 2 S 2 o 8 The ...

Embodiment 2

[0072] High-nickel polycrystalline Ni with a Dv50 of 14 μm 0.92 co 0.05 mn 0.02 Al 0.01 (OH) 2 Precursor, ethyl orthosilicate Si(OC 2 h 5 ) 4 Mix according to the molar ratio of 1.0:0.03, add to the mixed solution of absolute ethanol and deionized water to dissolve, and obtain the mixed solution A. The mass ratio of deionized water to precursor is 2:5; the volume ratio of deionized water to ethanol is 2:50.

[0073] The mixture A was stirred at 50 °C for 5 h, and then continued to stir at 80 °C until the solution was completely evaporated to obtain large particles of Ni 0.92 co 0.05 mn 0.02 Al 0.01 (OH) 2 @SiO 2 Precursor, coded as Lp.

[0074] High nickel polycrystalline Ni with a Dv50 of 3.5 μm 0.88 co 0.06 mn 0.05 Al 0.01 (OH) 2 The precursor was added to deionized water to prepare slurry B, the weight ratio of precursor to deionized water was 1:5; 2 mol / L Na 2 S 2 o 8 The solution and 4mol / L NaOH solution are configured in a volume ratio of 1:1 to form...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses a modified NCMA quaternary positive electrode material and a preparation method thereof. The quaternary positive electrode material is prepared by grading and sintering two precursors with different secondary particle sizes, and before grading, the two precursors are pretreated. The precursors are pretreated: in-situ coating treatment is conducted on the precursor with the large particle size, so that the rate performance of the precursors is improved, and the capacity of the precursors is improved; a precursor with a small particle size is subjected to pre-oxidation treatment, so that the structural stability of the precursor is improved, and the cycling stability of the precursor is improved. The two pre-treated precursors with different sizes are mixed with lithium according to a certain proportion and sintered, so that the quaternary positive electrode material with relatively high compaction density and relatively good comprehensive performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a modified NCMA quaternary cathode material and a preparation method thereof. Background technique [0002] With the rapid development of the new energy automobile industry, it is difficult for the current commercial cathode materials to meet people's high requirements for cruising range in terms of energy density. materials have received extensive attention. At present, the mainstream high nickel materials are mainly divided into lithium nickel cobalt aluminum oxide (NCA, LiNi x co y Al 1-x-y o 2 ) and lithium nickel cobalt manganese oxide (NCM, LiNi x co y mn 1-x-y o 2 ) two categories. In fact, these two transition metal oxides can also be considered as Co, Mn and Co, Al doped LiNiO 2 Material. As the nickel content in the material increases, the composition of NCM and NCA materials is closer to that of LiNiO 2 , so these two high-nickel terna...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00C01B33/32
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/624H01M10/0525C01G53/44C01B33/32H01M2004/021H01M2004/028C01P2004/80C01P2004/03C01P2006/40C01P2006/10Y02E60/10
Inventor 黄滔李厦李旻周友元黄承焕赵俊豪熊学
Owner HUNAN CHANGYUAN LICO CO LTD
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