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Preparation method of nickel-cobalt-manganese ternary precursor doped with zirconium iron

A nickel-cobalt-manganese ternary and precursor technology, applied in chemical instruments and methods, nickel compounds, electrical components, etc., can solve the problems of battery cycle and rate performance reduction, battery safety impact, poor cycle stability, etc., to achieve excellent Cycle performance, easy industrial application, narrow particle size distribution effect

Active Publication Date: 2021-12-21
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current problems of high-nickel ternary cathode materials are: due to Li + with you 2+ diameter close to that of Li + / Ni 2+ The mixed arrangement reduces the cycle and rate performance of the battery; the irreversible phase transition (H2-H3) caused by the increase of Ni content leads to poor cycle stability; the embedded positive electrode material in the lithium battery will release oxygen after heating and react with the electrolyte , thus generating more heat, leading to thermal runaway
Moreover, the release of oxygen will lead to microstructural defects, such as the formation of holes in the battery, which will have a significant impact on battery safety

Method used

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  • Preparation method of nickel-cobalt-manganese ternary precursor doped with zirconium iron
  • Preparation method of nickel-cobalt-manganese ternary precursor doped with zirconium iron
  • Preparation method of nickel-cobalt-manganese ternary precursor doped with zirconium iron

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation of zirconium-iron-doped nickel-cobalt-manganese ternary precursor comprises the following steps:

[0036] (1) According to the molar ratio of Ni:Co:Mn=91.836±0.5 : 4.082±0.3: 4.082±0.3 to prepare 100 L of nickel-cobalt-manganese soluble brine solution, the mass of nickel sulfate, manganese sulfate and cobalt sulfate should be 50.21 kg, 2.41 kg and 1.44 kg.

[0037] (2) Preparation of ferrous salt and zirconium salt solution

[0038] Zr is added in the form of doping, and the doping amount is 9688ppm. Accurately prepare 20L, 0.02 mol / L Zr doping solution: weigh 0.4mol (218.88g) of Zr(SO 4 ) 4 4H 2 O powder was dissolved in 20 L of water to prepare a 0.02 mol / L doped Zr solution.

[0039] Fe is added in the form of doping, and the doping amount is 5930ppm. Accurately prepare 20L, 0.02mol / L Fe-doped solution: weigh 0.4mol (71.936g) of FeC 2 o 4 • 2H 2 O powder, dissolved in 20L water, add H 2 SO 4 Adjust the pH to 3~5 to prepare 0.02 mol / L Fe solutio...

Embodiment 2

[0067] Preparation of zirconium-iron-doped nickel-cobalt-manganese ternary precursor comprises the following steps:

[0068] (1) According to the ratio of Ni:Co:Mn=63.16±0.5 : 18.42±0.3: 18.42±0.3 to prepare 100 L of nickel-cobalt-manganese soluble brine solution, the mass of nickel sulfate, manganese sulfate and cobalt sulfate to be added is 34.83kg respectively , 10.95kg and 6.54kg.

[0069] (2) Preparation of ferrous salt and zirconium salt solution

[0070] Zr is added in the form of doping, and the doping amount is 24233ppm. Accurately prepare 20L, 0.05mol / L Zr doping solution: weigh 0.1mol (54.72g) of Zr(SO 4 ) 4 4H 2 O powder was dissolved in 20 L of water to prepare a 0.05 mol / L doped Zr solution.

[0071] Fe is added in the form of doping, and the doping amount is 14833ppm. Accurately prepare 20L, 0.05mol / L Fe-doped solution: weigh 0.1mol (17.98g) of FeC 2 o 4 • 2H 2 O powder, dissolved to 20L water, add H 2 SO 4 Adjust the pH to 3~5 to prepare a 0.05mol / L ...

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Abstract

The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a preparation method of a zirconium-iron-doped nickel-cobalt-manganese ternary precursor. The present invention introduces Zr and Fe doping into the ternary precursor, adopts the complexation control crystallization co-precipitation method, and prepares zirconium iron doped by controlling the pH value, ammonia concentration, reaction temperature, solid content and other parameters of the reaction system. Nickel-cobalt-manganese ternary precursor. The present invention introduces Zr and Fe doping into the ternary precursor, and the positive electrode material inheriting its performance is precipitated without oxygen at high temperature, and has excellent cycle performance, capacity retention rate, rate performance and thermal stability. The zirconium-iron-doped nickel-cobalt-manganese ternary precursor prepared by the method of the invention has the characteristics of uniform internal and external structures, narrow particle size distribution, uniform particle shape, and good sphericity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a preparation method of a zirconium-iron-doped nickel-cobalt-manganese ternary precursor. Background technique [0002] In recent years, with the increasing use of electronic products, especially the development of the new energy vehicle industry, the demand for high-power, high-energy and high-safety lithium-ion batteries has prompted people to continuously seek batteries with better performance system. High-nickel ternary lithium-ion batteries increase the energy density of materials due to their high nickel content, less cobalt reduces material costs, and lower manganese improves cycle performance, making high-nickel ternary cathode materials a future power battery, storage One of the mainstream materials for energy batteries. [0003] The current problems of high-nickel ternary cathode materials are: due to Li + with you 2+ diameter close...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/50H01M4/505H01M4/525H01M10/0525C01P2006/40C01P2004/03C01P2004/32C01P2006/80C01P2006/12Y02E60/10
Inventor 张宝邓鹏程诚林可博邓梦轩丁瑶张珂
Owner ZHUJI PAWA NEW ENERGY
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