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Recovery method and application of retired lithium ion battery electrode material

A lithium-ion battery and electrode material technology, which is applied in the field of decommissioned lithium-ion battery electrode material recovery, can solve the problems of high energy consumption, high temperature environment, and large amount of acid used in fire recovery, so as to reduce the process and environment of recycling and reuse. The effect of less pollution and simple process

Pending Publication Date: 2022-04-22
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current positive electrode material recovery process, fire recovery and wet recovery are mainly used. The fire recovery consumes a lot of energy, and the recovery of the positive electrode sheet by wet recovery involves battery dismantling, crushing, sorting, and acid leaching. In the process of acid leaching, 8-10% of the aluminum foil will not be sorted out and still mixed in the electrode material. During the acid leaching process, the residual aluminum reacts with the acid to generate hydrogen gas, while H 2 o 2 Oxygen is generated in the solution at 60-80°C, so there is a risk of explosion, and the amount of acid used is large, and the temperature of the solution needs to be maintained during the leaching process, which consumes a lot of energy and causes high temperature in the environment

Method used

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  • Recovery method and application of retired lithium ion battery electrode material
  • Recovery method and application of retired lithium ion battery electrode material
  • Recovery method and application of retired lithium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for recycling electrode materials of decommissioned lithium-ion batteries, refer to figure 1 , the specific process is:

[0029] (1) Disassemble the power battery unit (nickel-cobalt-manganese ternary battery) after deep discharge, sort out the positive and negative electrode sheets, use the positive electrode sheet and the metal Pt electrode as the cathode and anode respectively, and mix 0.5mol / L of oxalic acid was used as electrolyte, electrolyzed at 1.2V voltage, and the resulting precipitate was filtered to obtain solution A and filter residue A, then filter residue A was acid-washed with hydrochloric acid, filtered again to obtain solution B and filter residue B, and then an extractant was used P204 extracts and purifies solution B, then alkalizes to form nickel-cobalt-manganese salt mixed hydroxide, and adds sodium carbonate to solution A to prepare lithium carbonate precipitation to obtain lithium salt;

[0030] (2) Rinse the negative electrode sheet w...

Embodiment 2

[0035] A method for recycling electrode materials of decommissioned lithium ion batteries, the specific process is as follows:

[0036] (1) Disassemble the battery cell (nickel-cobalt-manganese ternary battery) after deep discharge, sort out the positive and negative electrode sheets, use the positive electrode sheet and the metal Pt electrode as the cathode and anode respectively, 0.1mol / L oxalic acid For electrolyte, electrolyze under 1.2V voltage, filter the resulting precipitation to obtain solution A and filter residue A, then pickle filter residue A with hydrochloric acid, filter again to obtain solution B and filter residue B, then use extractant P204 to the solution. B is extracted and purified, then alkalized to form nickel-cobalt-manganese salt mixed hydroxide, and sodium carbonate is added to solution A to prepare lithium carbonate precipitation to obtain lithium salt;

[0037] (2) Rinse the negative electrode sheet with a large amount of water, heat and concentrate...

Embodiment 3

[0042] A method for recycling electrode materials of decommissioned lithium ion batteries, the specific process is as follows:

[0043] (1) Disassemble the battery cell (nickel-cobalt-manganese ternary battery) after deep discharge, sort out the positive and negative electrode sheets, and use the positive electrode sheet and metal Pt electrode as the cathode and anode respectively, 0.2mol / L phosphoric acid For electrolyte, electrolyze under 1.5V voltage, filter the resulting precipitation to obtain solution A and filter residue A, then pickle filter residue A with hydrochloric acid, filter again to obtain solution B and filter residue B, then use extractant P204 to the solution. B is extracted and purified, then alkalized to form nickel-cobalt-manganese salt mixed hydroxide, filtered to obtain filtrate C, and sodium carbonate is added to the filtered filtrate to prepare lithium carbonate precipitation to obtain lithium salt;

[0044] (2) Rinse the negative electrode sheet with...

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Abstract

The invention discloses a retired lithium ion battery electrode material recycling method and application thereof. The retired lithium ion battery electrode material recycling method comprises the steps that a retired lithium ion battery is disassembled, a negative plate is separated out, the negative plate is washed or soaked with water or acid, a lithium-containing solution and a lithium-removed negative plate are obtained, the lithium-containing solution is subjected to precipitation treatment, and lithium carbonate is obtained; and carrying out low-temperature calcination on the lithium-removed negative electrode plate in a vacuum or inert atmosphere to melt the binder, and then carrying out high-temperature calcination to carbonize the binder to obtain the carbon-coated graphite material. According to the method, the lithium resource in the SEI film of the graphite negative electrode is recycled, the SEI film in the negative electrode plate is washed or soaked, so that lithium ions enter the solution, the lithium resource is recycled, the negative electrode plate is calcined step by step, the binder PVDF is melted and coated on the surface of the graphite, and then the PVDF is pyrolyzed and carbonized at high temperature, so that the lithium resource is recycled. The in-situ carbon-coated recycled graphite material is formed, and the modified graphite can still be used as an electrode material to realize reutilization.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recycling, and in particular relates to a method for recycling electrode materials of decommissioned lithium ion batteries and applications thereof. Background technique [0002] Today, with the rapid development of new energy vehicles, the application of power batteries is huge, but the service life of power batteries is 3-8 years. The positive materials of power batteries are mainly nickel cobalt lithium manganate and lithium iron phosphate, while the negative electrode materials It is graphite that occupies most of the market, and there are some problems in the recycling process of batteries. [0003] In the current cathode material recycling process, fire recovery and wet recovery are mainly used. Fire recovery has high energy consumption. The recovery of cathode sheets by wet recovery is the process of battery disassembly, crushing, sorting, and acid leaching. During the process,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 余海军徐加雷谢英豪吴奔奔陈江东李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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