Recovery method for active matter from waste material containing lithium ionic cell anode active matter

A positive electrode active material and lithium-ion battery technology, which is applied in the field of recycling active materials in waste materials, can solve the problems of poor performance of positive electrode active materials and low recovery rate of positive electrode active materials, and achieve short roasting time, good dispersion and high purity Effect

Inactive Publication Date: 2008-06-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses different chemicals together from water-based solutions like ethylene glycol monomethylethermal acid ammonia (EGTA) and acetonitrile to effectively extract tiny parts called binders that remain on the surface of anode materials without sticking them onto other components inside these battery cells. These techniques improve the efficiency and quality of Lithium production processes while reducing costs associated with separating excess binder after create certain types of impurities.

Problems solved by technology

Layered nickel sulphoferrite (LNS)-based negative elec trodes have been developed due to their ability to store energy without losing them when they go back up overtime. However, there has always existed issues related to how efficiently recover spent lithiated cells containing LS-, LCO2/Li, MnO1.2 /Pb2. It involves separating certain components beforehand, followed by thermal treatments like burning off excess parts while leaving behind only those needed for good quality products. Additionally, current methods require expensive equipment and long periods of processing times.

Method used

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  • Recovery method for active matter from waste material containing lithium ionic cell anode active matter
  • Recovery method for active matter from waste material containing lithium ionic cell anode active matter

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This example illustrates the recycling method of waste materials containing positive electrode active materials provided by the present invention.

[0032] Under heating in a water bath at 85°C, 2000 grams of dry waste slurry containing lithium cobaltate and lithium manganate (active material in the dry waste slurry: acetylene black: polyvinylidene fluoride (PVDF) The weight ratio is 8:1:1) and 10,000 grams of N-methylpyrrolidone (NMP) are mixed evenly in a stirring tank with a volume of 15 liters, and stirred for 5 hours to make the binder polyvinylidene fluoride (PVDF) Fully dissolved in an organic solvent, the mixture was separated after standing for 15 hours, the upper layer of unsettled conductive agent and most of the adhesive dissolved in the organic solvent were poured off, and the lower layer of precipitate was separated. Then the lower layer of sediment was mixed with ethanol (the weight ratio of the lower layer of sediment to ethanol was 1: 0.7), and stirred ...

Embodiment 2

[0034] This example illustrates the recycling method of waste materials containing positive electrode active materials provided by the present invention.

[0035] Under heating in a water bath at 85°C, 2500 grams of spent pole pieces containing lithium nickel manganese cobalt oxide (on the pole piece lithium manganese cobalt acid: acetylene black: the mass ratio of polyvinylidene fluoride (PVDF) is 8:1 : 1, the substrate is aluminum foil) and 8500 grams of N, N-dimethylacetamide in a volume of 15 liters of mixing tank mixed, and stirred for 5 hours, sieved to remove the aluminum foil (the aluminum foil weighed 196 after drying. gram). After standing still for 10 hours, the mixture was separated into layers, the upper layer of unsettled conductive agent and most of the adhesive dissolved in the organic solvent were poured off, and the lower layer of precipitate was separated. Then mix the lower layer of precipitate with isopropanol (the mass ratio of the lower layer of non-pre...

Embodiment 3

[0037] This example illustrates the recycling method of waste materials containing positive electrode active materials provided by the present invention.

[0038] Under heating in a water bath at 95°C, 3000 grams of spent pole pieces containing lithium nickel manganese cobalt oxide (on the pole piece lithium manganese cobalt acid: acetylene black: the mass ratio of polyvinylidene fluoride (PVDF) is 8:1 : 1, the substrate is aluminum foil) and 5000 grams of N, N-dimethylacetamide and 5000 grams of N-methylpyrrolidone (NMP) are mixed uniformly in a stirring tank with a volume of 15 liters, and stirred for 5 hours, and sieved The aluminum foil was removed (weighed 196 grams after the aluminum foil was dried). After standing still for 8 hours, the mixture was separated into layers, the upper layer of unsettled conductive agent and most of the adhesive were poured off, and the lower layer of sediment was separated. Mix the sediment in the lower layer with acetone (the mass ratio o...

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Abstract

The invention relates to a method for recovering active material in waste of anode active material of a lithium ion battery. The waste contains anode active material of the lithium ion battery, binder and conductive agent. The method includes the processes: removing most of the binder and the conductive agent in the waste of the anode active material of the lithium ion battery, and then further removing small part of the binder and the conductive agent remained in the anode active material, wherein the method for removing small part of the binder and the conductive agent remained in the anode active material includes washing the anode active material in which the small part of the binder and the conductive agent is remained with cleaning agent, which is one or more selected from alcohol, aqueous solution of alcohol, aldehyde, aqueous solution of aldehyde, ketone, aqueous solution of ketone and aether. The method in the invention has a high recovery rate, and the recovered cathode active material has high purity and good performance and can be directly used for the preparation of a lithium ion secondary battery.

Description

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Claims

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Application Information

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Owner BYD CO LTD
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