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Method for preparing high-nickel-based cathode materials for lithium-ion batteries by electrolysis

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of mixed cations, the deterioration of electrical properties of positive electrode materials in high nickel systems, etc., to reduce internal resistance, improve telephony performance, The effect of good conductivity

Active Publication Date: 2015-10-28
成都巴莫科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In air atmosphere, when the temperature exceeds 725°C, Ni 3+ will also revert to Ni 2+ , causing cation mixing in the material, and rapidly deteriorating the electrical properties of the high-nickel system cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] will be 20 g Ni 0.8 co 0.2 (OH) 2 Put it into an electrolytic cell with a diaphragm. The electrolytic cell contains a mixed solution with a concentration of 3mol / L LiOH and 1.5mol / L LiCl as the electrolyte. Under the stirring state, the electrolysis is carried out in a constant voltage mode, and the voltage is controlled at 15V. Electrolyzed at 20°C for 5h, the obtained nickel cobalt oxyhydroxide Ni 0.8 co 0.2 OOH was filtered, dried at 100°C for 10h, and the degree of oxidation was determined to be 94%. Mix the dried nickel-cobalt oxyhydroxide with lithium hydroxide according to the ratio of Li / (Ni+Co)=1.05 (molar ratio), keep the mixture at 500°C for 4h, then raise the temperature to 750°C for 20h, heat treatment During the process, a mixture of oxygen and air is introduced, and the oxygen content is controlled at 45% to 55%. After the heat treatment is completed, it is pulverized after cooling to obtain LiNi 0.8 co 0.2 o 2 Cathode material. The positive el...

Embodiment 2

[0021] 20g Ni 0.8 co 0.1 mn 0.1 (OH) 2 Put it into an electrolytic cell with a diaphragm. The electrolytic cell contains a mixed solution with a concentration of 0.1mol / L lithium hydroxide and 0.1mol / L lithium nitrate as the electrolyte, and uses a constant voltage method for electrolysis under stirring. Controlled at 15V, electrolysis at 20°C for 50h, the resulting nickel oxyhydroxide cobalt manganese Ni 0.8 co 0.1 mn 0.1 OOH was filtered, dried at 150°C for 4 hours, and the degree of oxidation was determined to be 94%. Mix the dried nickel-cobalt-manganese oxyhydroxide with lithium hydroxide according to the ratio of Li / (Ni+Co+Mn)=1.05 (molar ratio), keep the mixture at 500°C for 4 hours, and then raise the temperature to 750°C for heat preservation 20h, feed oxygen in the heat treatment process, and control the oxygen content in it to be greater than 95%. After the heat treatment is completed, it is pulverized after cooling to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 Ca...

Embodiment 3

[0023] 20g Ni 0.8 co 0.2 (OH) 2 Put it into an electrolytic cell with a diaphragm. The electrolytic cell contains a mixed solution with a concentration of 1.5mol / L lithium hydroxide and 3mol / L lithium sulfate as the electrolyte, and uses a constant voltage method for electrolysis under stirring. The voltage is controlled Electrolyze at 10V, 60°C for 25h, the obtained nickel oxyhydroxide cobalt Ni 0.8 co 0.2OOH was filtered, dried at 120°C for 8 hours, and the degree of oxidation was determined to be 95%. Mix the dried nickel-cobalt oxyhydroxide with lithium hydroxide according to the ratio of Li / (Ni+Co)=1.10 (molar ratio), keep the mixture at 550°C for 6h, then raise the temperature to 700°C for 18h, heat treatment During the process, a mixture of oxygen and air is introduced, and the oxygen content is controlled at 45% to 55%. After the heat treatment is completed, it is pulverized after cooling to obtain LiNi 0.8 co 0.2 o 2 Cathode material. The positive electrode m...

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Abstract

The invention discloses a method for preparing a high nickel-based anode material for a lithium ion battery through electrolytic process. The method comprises the following steps: separating an anode chamber of an electrolytic cell from a cathode chamber of the electrolytic cell by using a diaphragm; using a mixed solution of LiOH and soluble lithium salt in the anode chamber and the cathode chamber as electrolyte, and putting Ni(l-x-y)CoxMny(OH)2 in the electrolyte of the anode chamber, wherein x is greater than or equal to 0 and is less than or equal to 0.5, and y is greater than or equal to 0 and is less than or equal to 0.3; stirring and electrolyzing for 5-50 hours at the constant pressure of 2.0-15V and the temperature of 25-60 DEG C so as to generate hydroxyl nickel oxide; filtering and drying hydroxyl nickel oxide cobalt manganese prepared by electrolyzing, mixing the hydroxyl nickel oxide cobalt manganese with lithium hydroxide, and then carrying out thermal treatment for 16-24 hours at the temperature of 500-900 DEG C in air atmosphere or oxygen atmosphere, thus obtaining the high nickel-based anode material. The prepared high nickel-based anode material has high specific capacity and good cycle performance and is short in calcination time and low in processing cost.

Description

technical field [0001] The invention relates to a preparation method of a high-nickel system positive electrode material using nickel oxyhydroxide cobalt manganese as a precursor, and belongs to the technical field of lithium ion batteries. Background technique [0002] Due to its high energy density, small self-discharge, and good cycle performance, lithium-ion batteries have become the most important secondary batteries and are used in various mobile electronic consumer products, power tools, electric bicycles, and electric and hybrid vehicles. With the development of technology, the demand for the energy density of lithium-ion batteries is getting higher and higher, especially in recent years, the demand for the rapid development of new energy vehicles has become more and more urgent, and the demand for high-energy-density lithium-ion batteries is increasing day by day. The key to lithium-ion battery technology lies in the positive electrode material. The specific capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525C01G53/04
CPCY02E60/122C01G53/04H01M4/525Y02E60/10
Inventor 陈勃涛唐淼徐宁吴孟涛
Owner 成都巴莫科技有限责任公司
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