Method for recycling lithium in lithium battery cathode materials by electrochemical method

A technology of battery positive electrode and positive electrode material, which is used in battery recycling, electrochemical generators, secondary batteries, etc., to achieve high-efficiency recycling, adjustable quality, and a variety of effects

Inactive Publication Date: 2016-09-14
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is to use the acid-dissolved solution of the waste lithium iron phosphate positive electrode material of the lithium ion battery as the electrolyte to recover lithium, and the recov

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: take lithium ferrous phosphate material as the positive electrode sheet, use sodium chloride solution as the electrolyte, and graphite as the negative electrode, apply a 0.1V potential to it in the electrolytic cell for electrochemical recovery, wherein the concentration of the sodium chloride solution is 0.025mol / L, the time is 2h, so that the lithium ions in the positive plate move into the electrolyte solution to form a lithium-containing solution. A lithium-containing solution is obtained. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the migration rate of lithium can reach 95.3%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).

[0030] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L of Na 2 CO 3 , the excess coefficient is 105%, and the precipitation of lithi...

Embodiment 2

[0032] Step 1: Use lithium ferrous phosphate material as the positive electrode sheet, lithium sulfate solution as the electrolyte, and copper sheet as the negative electrode, apply a potential of 0.3V to it in the electrolytic cell for electrochemical recovery, and the concentration of the sodium chloride solution is 0.5mol / L, and the time is 1.5h, so that the lithium ions in the positive electrode move into the electrolyte solution to form a lithium-containing solution. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the removal rate of lithium can reach 99.1%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).

[0033] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L of Na 2 CO 3 , the excess coefficient is 105%, and the precipitation of lithium carbonate is obtained. After the prec...

Embodiment 3

[0035]Step 1: Use lithium cobalt oxide as the positive electrode, lithium hydroxide solution as the electrolyte, and copper sheet as the negative electrode, and apply a potential of 1.05V in the electrolytic cell for electrochemical recovery, wherein the concentration of lithium hydroxide solution is 0.35 mol / L, the time is 2.5h, so that the lithium ions in the positive electrode move into the electrolyte solution to form a lithium-containing solution. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the migration rate of lithium can reach 72.8%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).

[0036] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, into which CO 2 , the end point of the control reaction is: Li in the solution 2 Stop feeding CO when the O concentration is about 6g / L and the pH of t...

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Abstract

The invention relates to a method for recycling lithium in lithium battery cathode materials by an electrochemical method and belongs to the technical field of energy source materials. The method for recycling the lithium in the lithium battery cathode materials by the electrochemical method is provided to solve technical problems. According to the method, the lithium battery cathode materials serve as a cathode, a metal or carbon electrode serves as an anode, an aqueous solution serves as an electrolyte, and electric potential is applied, so that lithium ions in the lithium battery cathode materials migrate into the electrolyte aqueous solution to form a lithium-containing solution. Through the method, the lithium element in the lithium battery cathode materials can be simply and efficiently recycled. Further, the raw materials cover anode material leftover materials, wastes and lithium battery anodes existing universally on the market. Lithium products formed by recycling have the advantages of being large in number of varieties, adjustable in quality and the like.

Description

technical field [0001] The invention relates to a method for electrochemically recovering lithium in lithium battery cathode materials, and belongs to the technical field of energy materials. Background technique [0002] Lithium batteries, including lithium ion batteries and lithium metal batteries. Lithium-ion batteries usually use lithium-containing compounds as the positive electrode and carbon materials as the negative electrode. The lithium metal battery is a battery that uses a lithium compound as the positive electrode, lithium metal or lithium alloy as the negative electrode material, and uses a non-aqueous electrolyte solution. The lithium battery in the present invention includes lithium ion battery and lithium metal battery. [0003] In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, ...

Claims

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Application Information

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IPC IPC(8): C25C1/02H01M10/0525H01M10/54
CPCC25C1/02H01M10/0525H01M10/54C22B7/00C25B1/14C25B1/16Y02E60/10Y02P10/20Y02W30/84
Inventor 曹乃珍高洁徐川高宜宝陶帅党春霞
Owner TIANQI LITHIUM CORP
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