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Process for efficiently leaching anode active material of waste lithium battery

A technology for positive active materials and waste lithium batteries, which is applied in the field of high-efficiency leaching of positive active materials for waste lithium batteries, and can solve problems such as high cost, large environmental pollution, and low leaching efficiency

Inactive Publication Date: 2009-12-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the defects of low leaching efficiency, high cost, and large environmental pollution of positive electrode active materials in lithium-ion batteries in the prior art

Method used

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  • Process for efficiently leaching anode active material of waste lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh and disassemble the waste lithium-ion battery to obtain 300g of powder material, which is ground to pass through an 80-mesh sieve (average particle size is less than 178 microns). Add 300ml of hydrogen peroxide (30wt%) and 600ml of a mixed solution with a sulfuric acid concentration of 2mol / L, and stir and leach in two stages at 80°C for 3 hours. After filtering, the filtrate is sent to the next purification and impurity removal process, and the remaining residue is stirred at 80°C for 1 hour with 2 mol / L hydrochloric acid at a solid-to-liquid ratio of 1:1 g / ml. Filter, and the filtrate is sent to the next stage of purification process. The leaching rate of the active material in this embodiment is about 96.5%.

Embodiment 2

[0020] Weigh and disassemble the waste lithium-ion battery to obtain 300 g of powder material, which is ground to pass through an 80-mesh sieve. Add 300ml of hydrogen peroxide (30wt%) and 600ml of a mixed solution with a sulfuric acid concentration of 4mol / L, and stir and leach in two stages at 90°C for 3 hours. Filter, and send the filtrate to the next stage of purification process, and use 2mol / L hydrochloric acid to make the solid-to-liquid ratio 1:1g / ml for the remaining residue, and stir at 80°C for 2 hours. Filter, and the filtrate is sent to the next stage of purification process. The leaching rate of the active material in this embodiment is about 98%.

Embodiment 3

[0022] Weigh and disassemble the waste lithium-ion battery to obtain 300 g of powder material, which is ground to pass through an 80-mesh sieve. Add 450ml of hydrogen peroxide (30wt%) and 600ml of a mixed solution with a sulfuric acid concentration of 4mol / L, and stir and leach in 5 stages at 90°C for 4 hours. Filter, and send the filtrate to the next stage of purification process, and use 3mol / L hydrochloric acid to make the solid-to-liquid ratio 1:1g / ml for the remaining residue, and stir at 90°C for 2 hours. Filter, and the filtrate is sent to the next stage of purification process. The leaching rate of the active material in this embodiment reaches 99%.

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Abstract

The invention discloses a process for efficiently leaching an anode active material of a waste lithium battery, which is characterized by splitting a waste lithium-ion battery to obtain an anode active material, leaching the active material with a vitriol / hydrogen peroxide mixed solution in counter current in a plurality of sections, and leaching the left residue with hydrochloric acid. The process firstly uses a vitriol / hydrogen peroxide solution system to leach the anode active material and uses hydrochloric acid to leach the left residue. Therefore, poor working environment and heavy environment pollution caused by a large amount of Cl2 generated when independently using the hydrochloric acid to leach are weakened maximally, and the leaching yield of the anode active material is improved to uttermost extent. The leaching yield of the anode active material of the waste lithium battery can be up to 99 percent by the method.

Description

technical field [0001] The invention relates to comprehensive recovery and utilization of valuable components in waste lithium batteries, in particular to a method for efficiently leaching positive active materials of waste lithium batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in 1990, it has unique characteristics such as high specific energy, high working voltage, small size, light weight, wide application temperature range, low self-discharge rate, long cycle life, no pollution, and good safety performance. The advantages are widely used in many civilian and military fields, such as cameras, mobile phones, notebook computers and portable measuring instruments. Especially in the small battery market such as mobile communication, it will gradually replace nickel metal hydride batteries and nickel cadmium batteries. Lithium-ion batteries are also one of the preferred lightweight high-energy power batteries for future electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B3/10
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 唐新村满瑞林陈亮张阳曾智文李连兴肖源化王志敏瞿毅
Owner CENT SOUTH UNIV
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