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Recycling method of positive electrode powder of waste lithium ion battery

A lithium-ion battery and positive electrode technology, which is applied in the field of waste lithium battery positive electrode powder recovery, can solve problems such as pollution, low purity of nickel-cobalt-lithium-manganese-oxide ternary materials, and affect the impurity content of lithium-containing solutions, so as to improve the leaching rate , the effect of reducing the amount of acid

Active Publication Date: 2018-01-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since waste lithium batteries will inevitably be contaminated with impurities such as aluminum, copper, iron, sodium, potassium, calcium, silicon, etc. when recycling positive electrode materials, this patent is directly calcined without impurity removal, and the obtained nickel-cobalt lithium manganate ternary material is inevitable. The purity is not high, and it will also affect the impurity content of the lithium-containing solution

Method used

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  • Recycling method of positive electrode powder of waste lithium ion battery

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Embodiment 1

[0027] A method for recycling the positive electrode powder of waste lithium-ion batteries, comprising the following steps:

[0028] S1. Oxygen pressure acid leaching: add water to the positive electrode powder of waste lithium-ion batteries, add acid, pre-fill with oxygen, react at a temperature of 120°C, and filter to obtain acid leaching materials;

[0029] S2. Two-stage impurity removal: adjust the acid leaching material of S1 to pH 2.5 with an acidity regulator, react at a temperature of 80°C for 1 hour, filter, use an acidity regulator to adjust the pH value of the filtrate to 6, and react at a temperature of 70°C for 2 hours , filtered to obtain the impurity removal liquid;

[0030] S3. Extraction and impurity removal: adjust the pH value of the S2 impurity removal solution to 5, the saponification rate is 70%, O / A=1:2, four-stage countercurrent, and obtain a pure lithium-nickel-cobalt-manganese aqueous phase;

[0031] S4. Alkaline precipitation: Lithium nickel cobalt ...

Embodiment 2

[0035] A method for recycling the positive electrode powder of waste lithium-ion batteries, comprising the following steps:

[0036] S1. Oxygen pressure acid leaching: add water to the positive electrode powder of waste lithium-ion batteries, add acid, pre-fill with oxygen, react at a temperature of 150°C, and filter to obtain acid leaching materials;

[0037] S2. Two-stage impurity removal: adjust the acid leaching material of S1 to pH 1.5 with an acidity regulator, react at a temperature of 95°C for 1 hour, filter, use an acidity regulator to adjust the pH of the filtrate to 4, and react at a temperature of 90°C for 1 hour , filtered to obtain the impurity removal liquid;

[0038] S3. Extraction and impurity removal: adjust the pH value of S2 impurity removal solution to 2, saponification rate 20%, O / A=1:4, six-stage countercurrent, to obtain pure lithium nickel cobalt manganese aqueous phase;

[0039] S4. Alkaline precipitation: Lithium nickel cobalt manganese water phase ...

Embodiment 3

[0043] refer to figure 1 , the present invention proposes the recycling method of waste lithium-ion battery cathode powder, comprising the following steps:

[0044] S1. Oxygen pressure acid leaching: Add water to the positive electrode powder of waste lithium-ion batteries at a solid-to-liquid ratio of 1:3, add sulfuric acid according to 0.85 times the theoretical amount of the total metal content contained in the positive electrode powder and sulfuric acid reaction, and pre-fill with oxygen to The pressure of the system is 0.42MPa, the temperature is 142°C under stirring for 3 hours, the stirring speed is 550r / min, and the acid leaching material is obtained by filtration;

[0045] S2, two-stage impurity removal: adjust the acid leaching material of S1 to pH 2.2 with an acidity regulator, react at a temperature of 90°C for 1.5h, filter while hot, use an acidity regulator to adjust the pH value of the filtrate to 5, and ℃ for 2 hours, filtered to obtain the impurity removal so...

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Abstract

The invention discloses a recycling method of positive electrode powder of a waste lithium ion battery. The recycling method comprises the following steps of acid leaching based on oxygen pressure: adding water to the positive electrode powder of the waste lithium ion battery, adding acid, pre-filling oxygen, performing a reaction and filtering to obtain an acid leached material; impurity removalin two sections: adjusting the pH value of the acid leached material to 1.5-2.5, adding lithium hydroxide to be reacted, and performing filtering, and adjusting the pH value of the filtering liquid to4-6, performing a reaction and filtering to obtain an impurity removal liquid; extraction and impurity removal: adjusting the pH value of the impurity removal liquid to be 2-5, and performing extraction to obtain a pure lithium nickel cobalt manganese water phase; alkali sedimentation: adding lithium hydroxide to adjust the pH value to be 9-11 to deposit nickel cobalt manganese to obtain a ternary precursor raw material; and regulating the lithium-rich water phase into a neutral state by sulfuric acid, and performing evaporation and crystallization to obtain high-purity lithium sulfate. Metalcontents and recycled values are taken into comprehensive consideration, and the ternary precursor raw material and high-purity lithium sulfate are separated and prepared from the positive electrodepowder of the waste lithium ion battery; and meanwhile, the recycling method is short in flow, simple in operation, and green and environment friendly.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium battery cathode powder, in particular to a recycling method for waste lithium ion battery cathode powder. Background technique [0002] With the rapid development of my country's industrial economy, the consumption demand for mineral resources has increased rapidly, and the contradictions between storage, production and consumption of major minerals have become increasingly prominent. In order to comprehensively improve the protection degree of mineral resources for the development of my country's industrialization, the utilization mode of my country's mineral resources should gradually develop in the direction of equal emphasis on the development and utilization of primary natural resources, secondary renewable resources, and new and alternative resources. Lithium-ion batteries have been widely used in portable electrical appliances such as mobile phones, notebook computers, and c...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 徐懋曹丽娜张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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