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Preparation method of low-sulfur small-particle-size nickel-cobalt-manganese hydroxide

A hydroxide, nickel-cobalt-manganese technology, used in nickel compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unfavorable industrial applications, and achieve easy to expand production, high flexibility, particle dispersion and spherical shape. good effect

Active Publication Date: 2017-05-31
HUAYOU NEW ENERGY TECH (QUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual production and preparation process of small particle size (D50=2~5μm) secondary spherical particle nickel cobalt manganese hydroxide precursor, it is relatively easy to prepare the precursor with D50=3~5μm. For example, CN201310142370.4 patent adopts double Dispersants such as mixture and polyethylene glycol control the particle size of the precursor; but it is still difficult to prepare a precursor with D50=2~3μm. The existing patent CN201410154847.5 provides a method for preparing D50=2.5~ 4μm precursor, this method requires the use of precision filter tubes to increase the solid content of the slurry during the reaction process, which is not conducive to industrial applications

Method used

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  • Preparation method of low-sulfur small-particle-size nickel-cobalt-manganese hydroxide
  • Preparation method of low-sulfur small-particle-size nickel-cobalt-manganese hydroxide
  • Preparation method of low-sulfur small-particle-size nickel-cobalt-manganese hydroxide

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Embodiment 1

[0031] 1. Select nickel sulfate, cobalt sulfate and manganese sulfate, and prepare a mixed metal salt solution with a total metal ion concentration of 2.0mol / L according to the molar ratio of Ni:Co:Mn of 0.6:0.2:0.2; the prepared concentration is 6.0mol / L The sodium hydroxide solution is used as a precipitating agent; the ammonia solution with a concentration of 11.2mol / L is prepared as a complexing agent.

[0032] 2. Add 10L of bottom liquid to a 50L sealed reaction kettle with a stirring and temperature control device; the added bottom liquid is a solution with an ammonia concentration of 0.34mol / L, a pH value of 12.0, and a temperature of 50°C. Start stirring, and feed nitrogen into the reactor for atmosphere protection, and maintain nitrogen protection during the entire reaction process.

[0033] 3. Adjust the stirring speed of the reaction kettle to 700r / min, and use a precision metering pump to add the mixed metal salt solution, sodium hydroxide solution and ammonia solu...

Embodiment 2

[0038] 1. Select nickel sulfate, cobalt sulfate and manganese sulfate, according to the molar ratio of Ni:Co:Mn (1 / 3):(1 / 3):(1 / 3) to prepare a total metal ion concentration of 1.5mol / L Mix metal salt solution; prepare a sodium hydroxide solution with a concentration of 5.0mol / L as a precipitant; prepare an ammonia solution with a concentration of 10.6mol / L as a complexing agent.

[0039] 2. Add 200L of bottom liquid to a 1000L sealed reaction kettle with a stirring and temperature control device; the added bottom liquid is a solution with an ammonia concentration of 0.2mol / L, a pH value of 12.2, and a temperature of 45°C. Start stirring, and feed nitrogen into the reactor for atmosphere protection, and maintain nitrogen protection during the entire reaction process.

[0040] 3. Adjust the stirring speed of the reactor to 350r / min, and use a precision metering pump to add the mixed aqueous solution of nickel-cobalt-manganese soluble salts, sodium hydroxide solution and ammonia ...

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Abstract

The invention belongs to the technical field of synthesis of lithium ion battery ternary anode material precursors, and particularly relates to a preparation method of a nickel-cobalt-manganese hydroxide. The method comprises the following steps: preparing a small-particle-size nickel-cobalt-manganese hydroxide by a nucleation / crystallization isolation method: introducing a nickel-cobalt-manganese mixed metal solution, sodium hydroxide and ammonia water under the condition of a high pH value at the same time for nucleation, adding a certain amount of additive at the end of nucleation to help a crystal nucleus to be dispersed rapidly, and entering a crystal nucleus growing stage to obtain a spherical particular nickel-cobalt-manganese hydroxide with D50 being equal to 2 to 3 mum, high dispersity and high degree of sphericity; controlling the washing condition, so that the sulfur content of the nickel-cobalt-manganese hydroxide is as low as 1,500ppm. The method has the advantages of easiness and convenience in operation, high flexibility, no need of modifying a reaction kettle, easiness for expanded production and the like.

Description

technical field [0001] The invention belongs to the technical field of synthesis of precursors of ternary cathode materials for lithium ion batteries, and in particular relates to a preparation method of nickel-cobalt-manganese hydroxide. Background technique [0002] As a new type of green power source, lithium-ion batteries have been widely used in 3C digital electronic products, power tools, electric vehicles, energy storage and other fields. One of the key factors determining the electrochemical performance of lithium-ion batteries is the cathode material. Several positive electrode materials commonly used at present include lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide. Among them, lithium nickel cobalt manganese oxide has excellent comprehensive performance in terms of energy density, discharge voltage, cycle performance, thermal stability, self-discharge, cost, etc., and has gradually become the mains...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/50H01M4/52H01M10/0525
CPCC01G53/006C01P2004/04C01P2004/51C01P2004/61C01P2006/11C01P2006/12C01P2006/80H01M4/502H01M4/523H01M10/0525Y02E60/10
Inventor 王娟邱天何金华吴奇朱玉华赵斌杰
Owner HUAYOU NEW ENERGY TECH (QUZHOU) CO LTD
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