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Method for selectively recycling lithium in waste lithium ion battery positive electrode material

A technology for lithium-ion batteries and cathode materials, which is applied in the field of selective recycling of lithium in the cathode materials of waste lithium-ion batteries, can solve the problems that qualified lithium carbonate products cannot be obtained and are not suitable for recycling, and achieve industrial processes that are easy to implement and difficult to remove Small, selective effect

Inactive Publication Date: 2018-08-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method is not suitable for reclaiming the lithium in the positive electrode material, because: under this condition, the lithium in the positive electrode material is converted into lithium carbonate, and will not be leached into the solution, and the impurities in the positive electrode material aluminum, iron, Calcium, magnesium, etc. will be leached to the liquid phase together, even if a small amount of lithium is leached, qualified lithium carbonate products cannot be obtained

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  • Method for selectively recycling lithium in waste lithium ion battery positive electrode material

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Embodiment 1

[0041] A method for selectively reclaiming lithium in waste lithium-ion battery cathode materials, comprising the steps of:

[0042] (1) Put the waste lithium iron phosphate cathode material in a high-temperature kiln at 1300°C into the air as an oxidant reaction, the iron in it is oxidized to trivalent, and add 50% of the waste cathode powder as a sodium sulfate additive during high-temperature oxidation , to realize the decomposition of the structure of the positive electrode material of the lithium ion battery;

[0043] (2) Leach the high-temperature oxide material obtained in step (1) in water, and obtain a lithium-rich solution and other element precipitates (iron phosphate precipitation) after filtering.

[0044] The process flow chart of the selective recovery of lithium in the positive electrode material of waste lithium-ion batteries provided by this embodiment is as follows figure 1 shown.

[0045] After sampling and diluting the lithium-rich solution, use inductiv...

Embodiment 2

[0047] A method for selectively reclaiming lithium in waste lithium-ion battery cathode materials, comprising the steps of:

[0048] (1) Feed the waste lithium iron phosphate positive electrode material into oxygen at 800°C and adopt a high-temperature solid-phase reaction, wherein the iron is oxidized to trivalent, and add potassium sulfate additive with 50% of the waste positive electrode powder during high-temperature oxidation, Realize the decomposition of the cathode material structure of lithium-ion batteries;

[0049] (2) Leaching the high-temperature oxide material obtained in step (1) in a hydrochloric acid solution with a pH value of 3, and filtering to obtain a lithium-rich solution and iron phosphate precipitation.

[0050] After sampling and diluting the lithium-rich solution, use inductively coupled plasma atomic emission spectrometry to measure the lithium concentration in the solution to be 10.5g / L, and iron and phosphorus are less than 0.5g / L; The content of ...

Embodiment 3

[0052] A method for selectively reclaiming lithium in waste lithium-ion battery cathode materials, comprising the steps of:

[0053] Mix the waste lithium iron phosphate cathode material with a certain amount of water, and add ammonium persulfate as the oxidant to react at 80°C by the liquid phase method to realize the coupling of iron oxidation and lithium leaching, and add sulfuric acid with 5% mass of the cathode material Ammonium is used as an auxiliary agent, the structure of the positive electrode material of the lithium-ion battery is decomposed, and lithium is leached; the reacted material is filtered to obtain a lithium-rich solution and iron phosphate precipitation.

[0054] After sampling and diluting the lithium-rich solution, use inductively coupled plasma atomic emission spectrometry to measure the concentration of lithium in the solution to be 12g / L, and iron and phosphorus are less than 0.5g / L; It is determined that the lithium content is less than 0.1%, and th...

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Abstract

The invention provides a method for selectively recycling lithium in a waste lithium ion battery positive electrode material. The method comprises the following steps: (1) adding an oxidant into the waste lithium ion battery positive electrode material and carrying out oxidization reaction; converting lithium into water-soluble lithium salt through an auxiliary agent; (2) leaching the water-soluble lithium salt obtained by step (1) in water or an acidic solution and filtering to obtain a lithium-enriched solution and leached residues. The method provided by the invention has a simple flow anda clean process and the recycling rate of the lithium can reach 95 percent or above.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a method for recovering lithium in positive electrode materials, in particular to a method for selectively recovering lithium in positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the main type of power batteries due to their significant advantages of high voltage, large specific energy, light weight, long cycle life and good safety performance. With the development of the new energy vehicle industry, the related new energy vehicle power battery industry will also grow rapidly. At the same time, about 15% of the total power batteries are scrapped every year, and it is expected that the climax of lithium-ion battery scrapping will soon be ushered in. If waste lithium-ion batteries are not disposed of safely, it will cause great harm to the environment and public safety. The current conventional pra...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 张洋郑诗礼范兵强王晓健李平张盈乔珊周宏明
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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