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Method for recycling N-methyl-2-pyrrolidone from lithium battery electrode material

The technology of a methylpyrrolidone and a recovery method is applied in the field of recovery of N-methylpyrrolidone, which can solve the problems of low purity of N-methylpyrrolidone, and achieve the effect of improving the purity

Active Publication Date: 2014-12-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of low purity of N-methylpyrrolidone recovered in the prior art, the invention provides a method for recovering N-methylpyrrolidone in lithium battery electrode materials. The recovery efficiency of the method is high, and the recovered High purity of N-methylpyrrolidone

Method used

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  • Method for recycling N-methyl-2-pyrrolidone from lithium battery electrode material
  • Method for recycling N-methyl-2-pyrrolidone from lithium battery electrode material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0036] This example is used to illustrate the recovery method of N-methylpyrrolidone in the lithium battery electrode material disclosed in the present invention.

[0037] Take 100 parts by weight of waste materials of lithium battery cathode materials, add 1 part by weight of deionized water, and stir for 10 minutes to obtain a waste material mixture.

[0038] Add 5 parts by weight of polyaluminum chloride solution with a concentration of 8% to the above waste mixture, and stir for 10 minutes to obtain the product to be separated.

[0039]Then, the separated matter is transported to a belt filter press for solid-liquid separation, and the separated liquid passes through a cotton core filter, and then is distilled at 180° C. for 2.5 hours under normal pressure in a distillation kettle, and then continues to carry out rectification under reduced pressure. Under the pressure of 0.05MPa, rectification was carried out at 220°C for 1.5h to obtain the recovered product S1.

[0040]...

Embodiment 2

[0042] This example is used to illustrate the recovery method of N-methylpyrrolidone in the lithium battery electrode material disclosed in the present invention.

[0043] Take 100 parts by weight of waste material of lithium battery cathode material, add 35 parts by weight of deionized water, and stir for 10 minutes to obtain a waste material mixture.

[0044] Add 40 parts by weight of ferrous sulfate solution with a concentration of 0.5% to the above waste mixture, and stir for 10 minutes to obtain the product to be separated.

[0045] Then the separated matter is transported to a belt filter press for solid-liquid separation, and the separated liquid passes through a cotton core filter, and is then distilled at 240° C. for 0.5 h at atmospheric pressure in a distillation kettle, and then continues to carry out rectification under reduced pressure. Under the pressure of 0.01MPa, rectify at 200° C. for 1 hour to obtain the recovered product S2.

[0046] The purity of N-methyl...

Embodiment 3

[0048] This example is used to illustrate the recovery method of N-methylpyrrolidone in the lithium battery electrode material disclosed in the present invention.

[0049] Take 100 parts by weight of waste material of lithium battery cathode material, add 20 parts by weight of deionized water, and stir for 10 minutes to obtain a waste material mixture.

[0050] Add 0.5 parts by weight of diatomaceous earth to the waste mixture and stir for 5 min.

[0051] Then, 25 parts by weight of a polyacrylamide solution with a concentration of 0.8% was added to the waste mixture, and stirred for 10 minutes to obtain a product to be separated.

[0052] Transport the separated matter to a belt filter press for solid-liquid separation, and the separated liquid passes through a cotton core filter, then distills at 280°C for 0.3h at atmospheric pressure in a distillation kettle, and then continues to carry out rectification under reduced pressure. Under the pressure of -0.05MPa, rectify at 18...

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Abstract

The invention provides a method for recycling N-methyl-2-pyrrolidone from a lithium battery electrode material. The method comprises the following steps of: a, adding de-ionized water into lithium battery electrode material waste, and stirring the mixture to obtain a waste mixture, wherein the waste contains the N-methyl-2-pyrrolidone; b, adding a flocculant solution into the waste mixture, and stirring the mixture to obtain a matter to be separated, wherein the flocculant solution is the aqueous solution of a flocculant, and the flocculant is one or more of poly-aluminum chloride, calcium chloride, ferrous sulfate and polyacrylamide; c, filtering the matter to be separated, and separating an N-methyl-2-pyrrolidone-containing crude solution; and d, fractionizing the crude solution to obtain the N-methyl-2-pyrrolidone. The method is high in recycling efficiency, and the recycled N-methyl-2-pyrrolidone has high purity.

Description

technical field [0001] The invention relates to a method for recovering N-methylpyrrolidone, in particular to a method for recovering N-methylpyrrolidone in lithium battery electrode materials. Background technique [0002] Since the advent of lithium-ion secondary batteries around the 1990s, they have gradually become popular in the field of small secondary batteries due to their advantages such as high energy density, high working voltage, small self-discharge, long cycle life, no memory effect, good safety and environmental friendliness. It will replace nickel-cadmium batteries and nickel-metal hydride batteries as the mainstream of commercial high-end secondary batteries, and become an ideal power source for various portable electronic digital products such as mobile phones and notebook computers. It will also be an ideal power source for light-duty high-energy power batteries of electric vehicles in the future. At present, with the application of lithium-ion secondary b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C07D207/267
CPCY02W30/84
Inventor 义志杰邓洪波蒋连友
Owner BYD CO LTD