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Preparation method of ternary anode material precursor

A cathode material and precursor technology, applied in the field of cathode material precursor preparation, can solve the problems of large irreversible capacity, large particle size and wide particle size distribution for the first time, and achieve low cost, high density and good layered crystal structure. Effect

Active Publication Date: 2014-01-29
江西赣锋循环科技有限公司
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AI Technical Summary

Problems solved by technology

However, in the current technology, nickel-cobalt-manganese ternary cathode materials for lithium-ion secondary batteries have defects such as high production cost, large particle size, wide particle size distribution, particle agglomeration, and large initial irreversible capacity.

Method used

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  • Preparation method of ternary anode material precursor
  • Preparation method of ternary anode material precursor
  • Preparation method of ternary anode material precursor

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preparation example Construction

[0023] For a preparation method of a ternary cathode material precursor of the present invention, please refer to figure 1 , including the following process flow:

[0024] A. Acid leaching: use laterite nickel ore to produce electrolytic nickel intermediate product nickel manganese cobalt hydroxide enrichment as raw material, through acid leaching, the solid-liquid weight ratio is 1:1-1:4, to obtain nickel manganese cobalt acid solution;

[0025] B. Impurity removal and recrystallization: Add fluoride to the nickel-manganese-cobalt acid solution obtained in step A to remove calcium and magnesium impurities in the solution. The weight of the fluoride addition is the nickel-manganese-cobalt hydroxide concentrate in the A step 2% to 5% of the weight, and then filtered, concentrated, and crystallized to obtain a nickel-manganese-cobalt mixture;

[0026] C. Mixed salt preparation: Dissolve the nickel-manganese-cobalt mixture obtained in step B in water to form a nickel-manganese-c...

Embodiment 1

[0050] A. Acid leaching: Take 1000kg of laterite nickel ore to produce nickel hydroxide and cobalt concentrate, an intermediate product of electrolytic nickel, add 3000kg of sulfuric acid (98% by mass) for leaching, and stir vigorously for 30 minutes to obtain a nickel-manganese-cobalt acid solution;

[0051] B. Impurity removal and recrystallization: Add 50Kg sodium fluoride to the nickel-cobalt-manganese acid solution in step A to remove calcium and magnesium impurities in the solution, filter, concentrate, and crystallize to obtain 1268kg of nickel-cobalt-manganese mixture;

[0052] C. Mixed salt preparation: After the nickel-manganese-cobalt mixture obtained in step B is dissolved in 5072kg of water, the total volume of the solution is 5713L, and the concentration of Ni, Mn, and Co ions in the solution obtained by sampling analysis is 0.73mol / L and 0.16mol respectively / L, 0.08mol / L, then add 708.24KgNi to the mixed solution 2 SO 4 .6H 2 O, 714.5kg MnSO 4 .H 2 O, 807.7...

Embodiment 2

[0059] A. Acid leaching: Take 500kg of laterite nickel ore to produce nickel hydroxide and cobalt concentrate, an intermediate product of electrolytic nickel, add 2000kg of hydrochloric acid (36%) for leaching, and stir vigorously for 30 minutes to obtain nickel-cobalt-manganic acid solution;

[0060] B. Impurity removal and recrystallization: Add 10kg of sodium fluoride to the nickel-cobalt-manganese acid solution in step A and carry out chemical precipitation to remove calcium and magnesium impurities in the solution, filter, concentrate, and crystallize to obtain 716kg of nickel-cobalt-manganese mixture;

[0061] C. Mixed salt preparation: After the nickel-cobalt-manganese mixture obtained in step B is dissolved in 2148kg of water, the total volume of the nickel-manganese-cobalt mixture obtained is 2518L, and the concentration of Ni, Mn, and Co salt in the nickel-manganese-cobalt mixture is obtained by sampling analysis 1.01mol / L, 0.26mol / L, 0.10mol / L, then add 146.82Kg NiCl...

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Abstract

The invention discloses a preparation method of a ternary anode material precursor. According to the preparation method, an intermediate product namely nickel-manganese-cobalt hydroxide concentrate generated by producing electrolytic nickel from laterite, and the preparation process comprises the following process flows: A, acid leaching; B, impurity removal and recrystallization; C, preparation of a mixed salt; D, preparation of a precipitant; E, synthetic reaction; F, adjustment of the pH value; G, separation and washing; H, drying. The ternary anode material precursor prepared by the preparation method disclosed by the invention is uniform in particle size distribution, high in activity, high in density, high in specific capacity and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material precursor, in particular to a preparation method of a high tap density and high uniformity ternary positive electrode material precursor. Background technique [0002] As a new generation of rechargeable high-energy batteries, lithium-ion secondary batteries have many advantages such as high working voltage, high energy density, good safety performance, long cycle life and low self-discharge. After the successful commercialization of the secondary battery, it has been widely used in many portable electronic devices such as mobile phones, notebook computers and instruments. Application prospects. [0003] The cathode material of a lithium-ion secondary battery is one of the main factors affecting its cost and performance. There are many series of cathode materials for lithium-ion secondary batteries currently being researched and developed, mainly including layered lithium ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李良彬白有仙邓招男封志芳邓云华侯太行刘明
Owner 江西赣锋循环科技有限公司
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