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Method for recycling negative material from waste lithium ion battery

A lithium-ion battery and negative electrode material technology, which is applied in the field of recycling negative electrode materials from waste lithium-ion batteries, can solve the problems of unfriendly environment, low yield, large dust, etc., achieve large market prospects and improve electrical performance , the effect of large labor utilization

Active Publication Date: 2015-06-24
信骅(上海)器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the crushing and spheroidizing process requires large-scale equipment, high energy consumption, low yield (generally only 40% to 60%), and large dust, which is not only unfriendly to the environment, but also harmful to workers who have been exposed to production for a long time. These are not in line with the guiding ideology of modern economic development on the road of green, ecological, environmental protection and sustainable development

Method used

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  • Method for recycling negative material from waste lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The 5,000 models are 18650, the original capacity is 2000-2200mAh, the negative electrode is made of artificial graphite, the coating amount of the negative electrode plate is 6g-8.5g (about 29Kg-42.5Kg negative electrode can be recovered), and the positive electrode is used for waste cylindrical lithium cobalt oxide. The ion battery is tested for voltage, and the battery that still contains a voltage above 2.0V is discharged, and then the battery is dismantled, and the battery cell is taken out, and then baked at a temperature of 80°C for 2 hours to make the excess The electrolyte was dried and volatilized, then the cell was removed, the negative electrode was taken out, and the nickel lug and high-temperature tape on the electrode were removed. A total of 52.5Kg of the electrode containing the negative active material and copper foil was received, and the electrode was removed. According to the ratio of pole piece: deionized water = 1:1.2, add it into 63Kg of deionized...

Embodiment 2

[0051] The 10,000 models are 523450, the original capacity is 1000-1100mAh, the negative electrode is made of natural graphite, the coating amount of the negative electrode plate is 3g-4g (about 28Kg-40Kg negative electrode can be recycled), and the positive electrode is made of waste square aluminum shell lithium cobalt oxide. For ion batteries, conduct voltage detection, discharge the batteries that still contain a voltage above 2.0V, then dismantle the batteries, take out the batteries, and bake them at 70°C for 1 hour to make them redundant. The electrolyte was dried and volatilized, and then the cell was removed, the negative plate was taken out, and the nickel lugs and high-temperature tape on the pole piece were removed. A total of 51.3Kg of the pole piece containing the negative active material and copper foil was received, and the pole piece was removed. According to the ratio of pole piece: deionized water = 1:1.5, add it into 77Kg of deionized water and stir to let t...

Embodiment 3

[0053]The 5,000 models are 32650, the original capacity is 5,000-5,100mAh, the negative electrode adopts a composite system of natural graphite and artificial graphite, the coating amount of the negative electrode plate is 14.5g-16g (about 70Kg-90Kg negative electrode can be recovered), and the positive electrode uses lithium phosphate The cylindrical steel-cased lithium-ion battery of iron-lithium is tested for voltage, and the battery with a voltage above 2.0V is discharged. Bake for 1 hour to dry and volatilize the excess electrolyte, then remove the cell, take out the negative electrode, and remove the nickel tab and high-temperature tape on the electrode, and receive a total of negative electrode active material and copper foil. The pole piece is 132Kg, and the pole piece is added to 77Kg of deionized water according to the ratio of pole piece: deionized water = 1:1.4, and stirred to fully dissolve the binder in the pole piece, so that the negative electrode active materia...

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Abstract

The invention discloses a method for recycling a negative material from a waste lithium ion battery. The method comprises the following steps of detecting the voltage of the waste lithium ion battery, disassembling the battery, taking out a cell, thoroughly separating the negative material on a negative pole piece from a copper foil, and carrying out the high-temperature impurity removal treatment on the recycled graphite negative material so as to finally obtain the graphite negative material of an original state. The method is simple and feasible, the cost is lower than that of the negative material which is sold in the market, no organic solvent is used in the recycling process, no dust is produced, and the method is environment-friendly compared with the production process of a normal negative material. Meanwhile, the recycling of the waste resource favors the protection of the existing resource and can guarantee the long-term development of the lithium ion battery industry.

Description

technical field [0001] The invention specifically relates to a method for recycling negative electrode materials from waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, light weight, long life and no memory effect since they were industrialized by Sony Corporation in 1992. Moreover, the global lithium battery market is basically dominated by Japan. In recent years, with the rapid rise of China and South Korea, Japan’s lithium battery market share has gradually decreased. The global lithium battery industry has formed a three-point pattern among China, Japan and South Korea. With the development of portable electrical equipment such as mobile phones and notebook computers, the global lithium-ion battery market has a large scale. [0003] At present, lithium-ion batteries have been widely used in mobile phones, notebook computers, PDAs, digital cameras and portable electric tools, among whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 田东
Owner 信骅(上海)器材有限公司
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