Ternary positive pole material precursor and method for adjusting and controlling crystal face growth of ternary positive pole material precursor

A cathode material and precursor technology, which is applied in the field of ternary cathode material precursors and regulating the growth of crystal planes of ternary cathode material precursors, to achieve the effect of increasing the proportion and promoting growth

Active Publication Date: 2019-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid development of electric vehicles and large-scale energy storage equipment, the current commercial cathode materials such as lithium cobalt oxide and lithium iron phosphate are difficult to meet the demand, and it is imperative to develop a new generation of high-capacity cathode materials

Method used

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  • Ternary positive pole material precursor and method for adjusting and controlling crystal face growth of ternary positive pole material precursor
  • Ternary positive pole material precursor and method for adjusting and controlling crystal face growth of ternary positive pole material precursor
  • Ternary positive pole material precursor and method for adjusting and controlling crystal face growth of ternary positive pole material precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh NiSO according to the molar ratio Ni: Co: Mn = 0.8: 0.1: 0.1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to make the total concentration of Ni, Co, Mn ions is 2mol L -1 mixed salt solution, and then use deionized water to prepare NaOH solution and ammonia water of the same concentration.

[0045] Add 50 mL of deionized water into the reaction kettle as the reaction base liquid, add 0.01 g of cetyltrimethylammonium bromide, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4mL / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction was completed, the obtained precipitate w...

Embodiment 2

[0048] Weigh NiSO according to the molar ratio Ni: Co: Mn = 0.8: 0.1: 0.1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to make the total concentration of Ni, Co, Mn ions is 2mol L -1 mixed salt solution, and then use deionized water to prepare NaOH solution and ammonia water of the same concentration.

[0049] Add 50 mL of deionized water into the reaction kettle as the reaction base liquid, add 0.5 g of cetyltrimethylammonium bromide, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4mL / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction was completed, the obtained precipitate wa...

Embodiment 3

[0052] Weigh NiSO according to the molar ratio Ni: Co: Mn = 0.9: 0.05: 0.05 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to make the total concentration of Ni, Co, Mn ions is 2mol L -1 mixed salt solution, and then use deionized water to prepare NaOH solution and ammonia water of the same concentration.

[0053] Add 50 mL of deionized water into the reaction kettle as the reaction base liquid, add 0.5 g of cetyltrimethylammonium bromide, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4mL / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction was completed, the obtained precipitate ...

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Abstract

The invention discloses a ternary positive pole material precursor and a method for adjusting and controlling crystal face growth of the ternary positive pole material precursor, and belongs to the field of chemical energy storage batteries. The chemical formula of the ternary positive pole material precursor is Ni<x>Co<y>Mn<1-x-y>(OH)<2>, wherein 0<x<1, 0<y<1, and 0<(x+y)<1; primary particles ofthe precursor are nanosheets, and the thickness of the nanosheets is 20-250nm. The method for adjusting and controlling crystal face growth comprises the steps that the nickel-cobalt-manganese ternarypositive pole material precursor is prepared by a hydroxide co-precipitation method, a surface active agent is added in the synthesizing process to adjust and control growth of the preferential crystal face in the primary particles of the nickel-cobalt-manganese ternary positive pole material precursor, precursor materials of different preferential crystal face proportions are obtained, the positive pole material with different Li<+> diffusion speed is obtained through subsequent lithium-mixing calcination, and different electromechanical properties are shown.

Description

technical field [0001] The invention belongs to the field of chemical energy storage batteries, and in particular relates to a precursor of a ternary positive electrode material and a method for regulating and controlling the crystal face growth of the precursor of a ternary positive electrode material. Background technique [0002] Facing the ever-increasing energy demand and environmental problems, lithium-ion batteries stand out because of their advantages such as high energy density, long service life, pollution-free, safe and reliable. However, due to the rapid development of electric vehicles and large-scale energy storage equipment, the current commercial cathode materials such as lithium cobalt oxide and lithium iron phosphate are difficult to meet the demand, and it is imperative to develop a new generation of high-capacity cathode materials. Nickel-cobalt-manganese ternary cathode material LiNi x co y mn 1-x-y o 2 (0<x<1, 0<y<1, 0<x+y<1) grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525B82Y40/00
CPCY02E60/10
Inventor 王敬王冉陈实苏岳锋吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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