Method for separating and recovering lithium from waste lithium ion battery

A lithium ion battery, separation and recovery technology, which is applied in the field of lithium ion recovery from waste lithium ion batteries, can solve the problems of low purity, lag in research and development, and low recovery rate of lithium ion products, and achieves a simple recovery method and low cost. Low, high purity effect

Active Publication Date: 2013-04-10
深圳市泰力废旧电池回收技术有限公司
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Problems solved by technology

[0003] Although the commercialization technology of lithium-ion secondary batteries has become more and more mature for decades, the research and development of the corresponding waste lithium-ion secondary battery recycling technology appears to be relatively lagging behind, especially the lithium-ion batteries obtained after a series of complex chemical treatments. The product recovery rate is low, the purity is not high, and most of them are in the laboratory research stage, and the technical convenience needs to be optimized and perfected

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  • Method for separating and recovering lithium from waste lithium ion battery

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Embodiment 1

[0027] Disassemble the waste lithium-ion battery after discharging, take the positive electrode current collector of the battery, add excess sodium hydroxide to the positive electrode current collector of the battery for alkaline leaching, dissolve the aluminum metal in the positive electrode current collector, and filter the alkaline leaching solution to obtain positive electrode powder , the positive electrode powder is leached with sulfuric acid and hydrogen peroxide, the pH value is adjusted to 2-3, filtered to obtain the filtrate, and the Fe in the filtrate 2+ oxidized to Fe by the oxidizing agent 3+ , then add calcium carbonate to adjust the pH value of the solution to 3.5-6.0, so that the iron precipitates, after filtering, adjust the pH value of the filtrate to 8, filter to remove impurities and precipitates, and obtain a recovery solution containing lithium ions; The recovered liquid is adjusted to a pH of 4, and the strongly acidic ion exchange resin G-26 is used to ...

Embodiment 2

[0029] Disassemble the waste lithium-ion battery after discharging, take the positive electrode current collector of the battery, add excess potassium hydroxide to the positive electrode current collector of the battery for alkaline leaching, dissolve the aluminum metal in the positive electrode current collector, and filter the alkaline leaching solution to obtain positive electrode powder , the positive electrode powder is leached with sulfuric acid and hydrogen peroxide, the pH value is adjusted to 2-3, filtered to obtain the filtrate, and the Fe in the filtrate 2+ oxidized to Fe by the oxidizing agent 3+ , then add calcium carbonate or magnesium oxide to adjust the pH value of the solution to 5.0, so that the iron precipitates, and after filtering, adjust the pH value of the filtrate to 9, filter to remove impurities and precipitates, and obtain a recovery solution containing lithium ions; Adjust the pH of the recovery solution to 6, use strong acidic ion exchange resin AM...

Embodiment 3

[0031] Disassemble the waste lithium-ion battery after discharging, take the positive electrode current collector of the battery, add excess potassium hydroxide to the positive electrode current collector of the battery for alkaline leaching, dissolve the aluminum metal in the positive electrode current collector, and filter the alkaline leaching solution to obtain positive electrode powder , the positive electrode powder is leached with sulfuric acid and hydrogen peroxide, the pH value is adjusted to 2-3, filtered to obtain the filtrate, and the Fe in the filtrate 2+ oxidized to Fe by the oxidizing agent 3+ , then add calcium carbonate or magnesium oxide to adjust the pH value of the solution to 3.5-6.0, so that iron precipitates, after filtering, adjust the pH value of the filtrate to be greater than or equal to 8, filter to remove impurities and precipitates, and obtain a recovery solution containing lithium ions The recovery solution containing lithium ions is adjusted to ...

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Abstract

The invention discloses a method for separating and recovering lithium from a waste lithium ion battery. The method comprises the following steps: dismounting after discharging the waste lithium ion battery, and removing a battery case; crashing a battery cell; leaching and filtering the crushed battery cell with inorganic acid and oxidant to obtain a filter liquor; regulating the pH of the filter liquor to be more than or equal to 8, then filtering to remove impurities and sediment to obtain a recovery liquor containing lithium ions; adsorbing the lithium ions in the recovery liquor through resin; and desorbing the resin to obtain the separated and recovered lithium salt. The recovery method provided by the invention is simple and efficient, has high purity of lithium and brings no pollution.

Description

【Technical field】 [0001] The invention relates to a method for recovering metals from waste batteries, in particular to a method for recovering lithium ions in waste lithium ion batteries. 【Background technique】 [0002] Lithium-ion battery is a rechargeable chemical battery with good comprehensive performance. It has the advantages of high working voltage, high specific energy, long cycle life, and small self-discharge. It is widely used in mobile communications, notebook batteries, portable tools, and electric vehicles. and other fields. The cathode materials currently used in lithium-ion secondary batteries on the market are mainly lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate and other binary / ternary materials containing lithium. These cathode materials all contain precious metal lithium resources. Due to the large amount of positive electrode materials used in lithium-ion batteries, the consumption of non-renewable metal resources is very large....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 张永祥万艳鹏刘宏伟
Owner 深圳市泰力废旧电池回收技术有限公司
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