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A kind of electrochemical preparation method of ternary cathode material

A positive electrode material, electrochemical technology, applied in the field of electrochemical preparation of ternary positive electrode materials, can solve the problems of difficult control of purity, high price, environmental pollution, etc., achieve uniform product components, good consistency, and reduce environmental pollution Effect

Active Publication Date: 2016-09-28
WUHU HUAXINNUO ELECTROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the battery-grade nickel source, cobalt source, and manganese source materials used in the chemical precipitation method are expensive, and the purity is not easy to control. The obtained ternary mixed coprecipitation needs to be filtered and washed many times, resulting in a large amount of waste water and polluting the environment.

Method used

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  • A kind of electrochemical preparation method of ternary cathode material
  • A kind of electrochemical preparation method of ternary cathode material
  • A kind of electrochemical preparation method of ternary cathode material

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Embodiment 1

[0017] A preparation method of a ternary positive electrode material, comprising the following steps:

[0018] (1) Prepare 100L 1.0mol / L acetic acid and citric acid electrolytes, which contain 0.8mol / L acetic acid and 0.2mol / L citric acid, use pure metal nickel, cobalt, and manganese as anodes, and use inert electrode titanium as the cathode , control the current 3A for electrolysis, stop the electrolysis when the electrolysis power reaches 160F (Faraday, 1F=26.8Ah), and obtain a solution with a concentration of 0.8mol / L nickel, cobalt, and manganese ions.

[0019] (2) Mix the nickel, cobalt, and manganese ion solutions at a molar ratio of nickel ions: cobalt ions: manganese ions = 0.5:0.2:0.3, and slowly add 1.0mol / L lithium hydroxide dropwise to the continuously stirred reactor , according to the molar ratio lithium ion: (nickel ion + cobalt ion + manganese ion) = 1.1:1 molar ratio measurement, the whole process is controlled at a temperature of about 50 ° C and stirred for ...

Embodiment 2

[0022] A preparation method of a ternary positive electrode material, comprising the following steps:

[0023] (1) Prepare 100L 2.0mol / L acetic acid and citric acid electrolytes, which contain 1.2mol / L acetic acid and 0.8mol / L citric acid, use pure metal nickel, cobalt, and manganese as anodes, and use inert electrode stainless steel as cathodes , control current 6A electrolysis, stop electrolysis when the electrolysis power reaches 240F, and obtain nickel, cobalt and manganese ion solutions with a concentration of 1.2mol / L.

[0024] (2), nickel, cobalt, manganese ion solution are mixed by the molar ratio of nickel ion: cobalt ion: manganese ion=1 / 3:1 / 3:1 / 3, slowly drop the lithium hydroxide of 1.0mol / L to In a continuously stirred reactor, the molar ratio of lithium ions: (nickel ions + cobalt ions + manganese ions) = 1.2:1 is measured, the temperature is controlled at about 60°C for 18 hours, and the pH is controlled at 8.5 to obtain a stream Phase-changing suspension.

[...

Embodiment 3

[0027] A preparation method of a ternary positive electrode material, comprising the following steps:

[0028] (1) Prepare 100L 2.6mol / L acetic acid and citric acid electrolytes, which contain 1.6mol / L acetic acid and 1.0mol / L citric acid, use pure metal nickel, cobalt, and manganese as anodes, and use inert electrode stainless steel as cathodes , control current 6A electrolysis, electrolysis electricity to 320F, stop electrolysis, the concentration is 1.6mol / L nickel, cobalt, manganese ion solution.

[0029] (2), nickel, cobalt, manganese ion solution are mixed by the molar ratio of nickel ion: cobalt ion: manganese ion=1 / 3:1 / 3:1 / 3, slowly drop the lithium hydroxide of 1.0mol / L to In the continuously stirred reactor, measure according to the molar ratio of lithium ions: (nickel ions + cobalt ions + manganese ions) = 1.15:1. During the whole process, the temperature is controlled at about 50°C and the reaction is stirred for 18 hours. The pH is controlled at 8 to obtain a rheo...

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Abstract

The invention discloses an electrochemical preparation method of a ternary anode material. According to the method disclosed by the invention, pure nickel, cobalt and manganese metals and electric energy are used as raw materials and a green electrochemical synthesis method is adopted for synthesizing a nickel, cobalt and manganese salt compound by means of electrolysis at normal pressure and normal temperature, and the ternary anode material-LiNixCoyMnzO2 can be obtained after lithium addition reaction, spray-drying and high-temperature treatment, wherein x is greater than 1 and less than 1, y is greater than 0 and less than 0.8, z is greater than 0 and less than 1, and x+y+z is equal to 1. Compared with the prior art, the electrochemical preparation method disclosed by the invention can be used for reducing the cost of raw materials and energy consumption, simplifying the process, also reducing the environmental pollution and improving the product performances. An electrochemical synthesis technology adopted by the method is an environmentally-friendly chemical process, the pure metals are used as anode materials and no impurities are introduced, so that the concentration controllability and the high purity of nickel ions, cobalt ions and manganese ions are guaranteed; meanwhile, the zero emission of wastewater to the environment is realized, and the continuous large-scale production can be realized.

Description

technical field [0001] The invention relates to a preparation method of a ternary positive electrode material for a lithium ion battery, in particular to an electrochemical preparation method of a ternary positive electrode material. Background technique [0002] At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobaltate, lithium iron phosphate, lithium manganate and ternary positive electrode materials. Nickel-cobalt lithium manganate ternary cathode material has high specific capacity, good safety performance and good rate discharge performance. It is a very potential cathode material for lithium-ion power batteries. It has great potential in power fields such as electric vehicles, electric spacecraft, and electric tools. Broad application prospects. [0003] At present, the preparation methods of ternary cathode materials mainly include high-temperature solid-phase sintering method and liquid-phase chemical precipitation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCC25B1/00H01M4/1391H01M4/505H01M4/525Y02E60/10
Inventor 褚道葆袁希梅
Owner WUHU HUAXINNUO ELECTROCHEM TECH
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