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Method for preparing nickel-cobalt-manganese ternary material precursor by using nickel-cobalt slag material

A ternary material, nickel-cobalt-manganese technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of complex process and high cost, and achieve the effect of simple process, low cost, and realization of recycling

Active Publication Date: 2017-05-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the defects of high cost and complicated process of the existing technology, the present invention provides a method for preparing the precursor of nickel-cobalt-manganese ternary positive electrode material by using nickel-cobalt slag; it aims to simplify the process and reduce the process cost

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  • Method for preparing nickel-cobalt-manganese ternary material precursor by using nickel-cobalt slag material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The raw material nickel-cobalt slag used in this example is taken from the smelting slag produced by a non-ferrous smelter in Xinjiang (the ratio of nickel and cobalt in the nickel-cobalt slag is 40:7), and manganese sulfate is obtained through purchase.

[0051] Step (1): First wash the slag with deionized water to dissolve the nickel sulfate crystals dissolved in the slag, and then add 0.5mol / L of sulfuric acid with a liquid-solid ratio of 8mL / g (based on the weight of nickel-cobalt slag) , control the pH of the system to 2.5-3.0; and stir and react at 40-50°C for 2h. The solution after the acid leaching reaction is filtered, washed, dried, and ground to obtain nickel-cobalt acid leaching slag and nickel-rich solution (which can be returned to the electrolytic nickel system through chemical removal and deep extraction of the extractant or to prepare a high-nickel ternary precursor body); the nickel-cobalt ratio of the nickel-cobalt acid leaching residue material is 1:...

Embodiment 2

[0061] Compared with Example 1, the only difference is that in step (1), after adding the sulfuric acid solution, the pH of the control system is 1.0; and the reaction is stirred at 50° C. for 2 hours. The nickel-cobalt ratio of the nickel-cobalt acid leaching residue material is 0.87:1. In addition, step (3): Add manganese source solution to the extraction and purification solution, introduce a small amount of nickel-cobalt-manganese from the outside to make the molar ratio of nickel-cobalt-manganese 1:1:1, and then co-precipitate to prepare the precursor of the ternary cathode material . However, in the first low-acid leaching process, the nickel solution contains 1.5g / L of cobalt ions, which causes some troubles in the removal of impurities in the part of the solution that returns to the electrolytic nickel system.

Embodiment 3

[0063] Compared with Example 1, the only difference is that in step (1), after adding the sulfuric acid solution, the pH of the control system is 3.5; and the reaction is stirred at 50° C. for 2 hours. The nickel-cobalt ratio of the nickel-cobalt acid leaching residue material is 1.03:1. In addition, step (3): Add manganese source solution to the extraction and purification solution, introduce a small amount of nickel-cobalt-manganese from the outside to make the molar ratio of nickel-cobalt-manganese 1:1:1, and then co-precipitate to prepare the precursor of the ternary cathode material .

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Abstract

The invention discloses a method for preparing a nickel-cobalt-manganese ternary material precursor by using a nickel-cobalt slag material. The method comprises the following steps: step (1), carrying out acid leaching treatment on the nickel-cobalt slag material with the nickel-cobalt mole ratio of 3 / 1 to 8 / 1 at the pH of 1 to 5 and the temperature of 30 to 80 DEG C, and then carrying out solid-liquid separation to obtain an acid leaching slag material with the nickel-cobalt mole ratio of 1: (0.9 to 1.1); step (2), carrying out hydrogen peroxide reduction leaching, chemical subtraction and extraction purification on the acid leaching slag material to obtain a nickel-cobalt solution; and step (3), adding manganese sulfate into the nickel-cobalt solution, and carrying out coprecipitation to obtain the nickel-cobalt-manganese ternary material precursor. In the method, the nickel-cobalt slag material is leached under the synergism of pH and temperature, the acid leaching slag material with the mole ratio of close to 1: 1 is obtained, then the reduction leaching, subtraction, purification and coprecipitation are carried out, and then the nickel-cobalt-manganese ternary material precursor meeting the requirement is obtained in one step.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a nickel-cobalt-manganese ternary cathode material precursor by using nickel-cobalt slag material and waste batteries. Background technique [0002] Nickel-cobalt-manganese ternary cathode material has the advantages of low raw material cost, high specific capacity, stable cycle performance, and good safety performance. The product, its cost performance is much higher than that of lithium cobalt oxide, and its capacity is 10-20% higher than that of lithium cobalt oxide. It is one of the new battery materials most likely to replace lithium cobalt oxide. The domestic demand for cathode materials gradually dominates with an annual growth rate of 20%. In 2012, the Ministry of Industry and Information Technology of our country included nickel-cobalt-manganese ternary materials into the high-tech products that were developed in the "Twelfth Five-Year P...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525
CPCH01M4/364H01M4/50H01M4/52H01M10/0525Y02E60/10
Inventor 唐新村刘文明王涛周乐吴仪娜
Owner CENT SOUTH UNIV
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