Recovery method for leftover and residue of positive electrode of lithium ion battery

A secondary battery and recovery method technology, applied in the field of recycling and reuse of active materials, can solve the problems of battery manufacturers such as loss of economic benefits, no memory effect, environmental pollution, etc., to avoid economic losses, low production costs, and significant economic benefits Effect

Inactive Publication Date: 2003-11-05
NANKAI UNIV
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Problems solved by technology

[0002] In recent years, with the rapid development of mobile communication products and various portable electronic products, the demand for secondary batteries is increasing day by day. In the past ten years since SONY first launched practical lithium-ion secondary batteries in 1991, lithium-ion secondary batteries With the rapid development of batteries, the advantages of high capacity, high discharge voltage, high specific energy, and no memory effect have gradually replaced nickel-cadmium batteries and nickel-hydrogen batteries in the field of small secondary batteries and become the mainstream of commercial high-end secondary batteries. In the field of electric tools and electric vehicles, it also has obvious advantages. With the continuous growth of output, the scraps and scraps in the manufacture of secondary lithium-ion batteries have also increased sharply. Most manufacturers only use these scraps and scraps as Disposal to relevant units at a low price or using acid and alkali treatment to obtain cobalt salt will not only cause a great loss of economic benefits for battery manufacturers, but also cause a lot of waste of resources and environmental pollution

Method used

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  • Recovery method for leftover and residue of positive electrode of lithium ion battery
  • Recovery method for leftover and residue of positive electrode of lithium ion battery

Examples

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Embodiment 1

[0020] Take 200g of positive electrode leftovers based on aluminum foil, after mechanical crushing, soak in 1000mL N-methylpyrrolidone solution at room temperature for one day, then raise the temperature to 140°C, and use mechanical stirring to make the active material LiCoO 2 , conductive agent, binder and matrix separation. Stand still, decant out the upper layer solution, wash the lower layer sediment with water several times, remove part of the water-soluble binder and conductive agent, and dry the product obtained after separation in the air at 100°C, the mixed mass is 150g, and use mechanical flotation The carbon black and insoluble binder were removed by the method, and the mixture was calcined at 850° C. for 6 hours to obtain 110 g of active material, accounting for 73.3% of the mass of the above mixture. The XRD structure diagram of the product obtained is as follows figure 1 . The recovered active material is used as the positive electrode material, and lithium met...

Embodiment 2

[0022] After mechanical crushing, 30g of positive electrode scraps and scraps based on aluminum foil were soaked in 1000mL dimethylacetamide at room temperature (20°C) for one day, and then the temperature was controlled at 100°C to make the active material LiCoO 2 , conductive agent, binder and matrix separation. Stand still, decant out the upper layer solution, wash the lower sediment with distilled water several times, remove part of the water-soluble binder and conductive agent, then decant out the distilled water, and dry it in the air at 100°C. The mixed mass is 23g. The selection method removes carbon black and insoluble binder, and bakes at 850°C for 6 hours to obtain 18g of active material, accounting for 78.3% of the mass of the above mixture. The XRD test result of gained product and figure 1 same. The recovered active material was used as the positive electrode material, metal lithium was used as the counter electrode, and a button battery was prepared, charged a...

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Abstract

The leftover and residue of positive electrode of lithium ion battery is crushed mechanically; its active positive electrode material, additive and adhesive attached to the aluminium foil base are separated through ultrasonic vibration, mechanical stirring or other process inside water or some organic solvent at certain temperature; and the active positive electrode material are then separated, washed, dried and high temperature processed to obtain positive electrode material, which has excellent performance and may be used directly. The present invention is significant to lowering battery producing cost and preventing environmental pollution.

Description

technical field [0001] The invention relates to the recovery and reuse of active materials in the positive electrode scraps and scraps of lithium-ion secondary batteries. Background technique [0002] In recent years, with the rapid development of mobile communication products and various portable electronic products, the demand for secondary batteries is increasing day by day. In the past ten years since SONY first launched practical lithium-ion secondary batteries in 1991, lithium-ion secondary batteries With the rapid development of batteries, the advantages of high capacity, high discharge voltage, high specific energy, and no memory effect have gradually replaced nickel-cadmium batteries and nickel-hydrogen batteries in the field of small secondary batteries and become the mainstream of commercial high-end secondary batteries. In the field of electric tools and electric vehicles, it also has obvious advantages. With the continuous growth of output, the scraps and scraps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00H01M10/54
CPCY02W30/84
Inventor 阎杰叶茂魏进平高学平
Owner NANKAI UNIV
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