Resource recycling method for waste lithium batteries

A waste lithium battery, recycling technology, applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of fluoride or electrolyte excessive discharge, to prevent global climate anomalies, facilitate continuous, easy operation The effect of simple method

Inactive Publication Date: 2016-09-07
上海赛特康新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology often emphasizes the first aspect, while ignoring the recovery of ha

Method used

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  • Resource recycling method for waste lithium batteries

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Effect test

Embodiment 1

[0034] Discharge 500kg of plastic-cased mobile phone lithium-ion batteries with an initial rated voltage of 3.7V in an aqueous solution of sodium sulfate to return the voltage to zero. After being fully dried, the plastic case is cut in a glove box under a nitrogen protective atmosphere, and the water vapor content in the glove box is lower than 50ppm. After the treatment is completed, transfer it from the transition chamber to a dry distillation kettle protected by airtight nitrogen, and distill for 90 to 120 minutes at a temperature of 150 to 200 ° C. The distillate flows into the recovery bottle through the condenser for absorption. At the same time, the fluorine-containing waste gas produced is absorbed by the absorption tower with lime water and calcium chloride spray solution and then recovered to ensure that the detection amount of hydrogen fluoride in the tail gas is lower than 10mg / m 3 . For the battery cell removed from the electrolyte taken out of the distillation ...

Embodiment 2

[0036] 1000kg of discarded lithium iron phosphate cylindrical steel case batteries with an initial rated voltage of 3.2V were discharged in an aqueous solution of sodium chloride to return the voltage to zero. After being fully dried, under the protection of argon, in a dry glove box with a water content controlled within 20ppm, use an electric saw to saw the steel shell to expose the inner winding core, and then enter the vacuumized room through an oxygen-free and water-free transition box. In the reaction kettle, under vacuum conditions, the temperature of the reaction kettle is raised to 150-200° C., and the vacuum pump is turned off. The distilled electrolyte vapor is introduced into the collection tank from the condensation pipe, while the non-condensable gas produced by the waste battery core is discharged and fully absorbed by the spray device for treating fluorine-containing waste gas to ensure that the hydrogen fluoride content in the discharged tail gas is lower than ...

Embodiment 3

[0038]Discharge 100kg of steel-cased cylindrical lithium manganese oxide batteries with an initial rated voltage of 3.7V in an aqueous solution of sodium sulfate to return the voltage to zero. After fully drying, dry gloves that control the water content below 30ppm under the protection of argon. In the box, use a chainsaw to saw the steel shell to expose the core package inside, and then enter the argon-protected reactor through the argon-protected transition box, raise the temperature of the reactor to 250-300°C, and the distilled electrolyte steam The condensing pipe is exported into the collection tank, and the non-condensable gas generated by the waste battery core is discharged and fully absorbed by the spray device for treating fluorine-containing waste gas to ensure that the hydrogen fluoride content in the discharged tail gas is lower than 10mg / m3 3 . The core package in the reaction kettle is shelled and removed after cooling the clean electrolyte, and the remaining ...

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Abstract

The invention discloses a resource recycling method for waste lithium batteries. The resource recycling method comprises the following steps: soaking in a solution for discharging, breaking shells and distilling an electrolyte under a vacuum condition or an inert atmosphere protection condition, mechanically smashing, separating current collectors and electrode materials by using difference of density, adding acid to dissolve filtered and separated carbon material, adding base to recycle transition metal elements in cathodes, adding salt to recycle lithium element, and carrying out evaporation-recrystallization to recycle byproducts. The manner that a dry method is combined with a wet chemical technology realizes separation recycling of battery materials, the method is low in invested cost and few in energy consumption, a recycling method for environmentally hazardous lithium hexafluorophate and inflammable carbonic ester is highlighted particularly, and secondary pollution cannot be caused in the recycling process; and moreover, no organic solvent is used in the process, zero emission of waste liquid is realized, and the method is suitable for large-scale recycling production.

Description

technical field [0001] The invention relates to a resource recovery and treatment method for waste lithium batteries, which belongs to the technical field of resource regeneration. Background technique [0002] Lithium-ion batteries were born in the 1990s. Due to their advantages of high energy density, long cycle life, safety and environmental protection, they are widely used in new energy vehicles, communication base stations, mobile phones, notebook computers, cameras and other fields. However, with the passage of time, the number of scrapped lithium-ion batteries has increased year by year due to the expiration of the battery cycle life, causing huge pressure on the ecological environment. If the used lithium-ion batteries are directly discarded in the environment, the leakage of fluorine-containing electrolyte due to the aging or corrosion of the shell will seriously pollute the soil, water and atmosphere, cause ecological disasters, and ultimately threaten human health...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 李长青庞雷汪晓伟王昕
Owner 上海赛特康新能源科技股份有限公司
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