Method for separating lithium cobalt oxides and graphite from waste lithium ion battery electrode material

A lithium-ion battery and electrode material technology, which is applied in the field of resource utilization of waste lithium-ion batteries, can solve the problems of high-efficiency separation and enrichment of the positive electrode material lithium cobaltate and negative electrode material graphite, and low economic benefits.

Active Publication Date: 2017-10-20
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

However, the current mechanophysical method only uses carbon-containing lithium cobalt oxide powder as a product, and has not realized efficient separation and enrichment of positive electrode material lithium cobalt oxide and negative electrode material graphite, and the economic benefits are still not high.

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  • Method for separating lithium cobalt oxides and graphite from waste lithium ion battery electrode material

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Embodiment

[0027] Such as figure 1 As shown, the present embodiment takes a small-scale experiment as an example, and the present invention is described in detail, including the following steps:

[0028] 1) 50 discarded lithium-ion batteries of the same type were discharged for protection, air-dried naturally, coarsely crushed by a shear crusher, finely crushed by a vertical impact crusher and pre-screened with a 0.25mm standard screen, and the product under the screen was The mixed raw material of lithium cobalt oxide and graphite, that is, the mixed positive and negative electrode materials of waste lithium ion batteries;

[0029] 2) Sieving the mixed positive and negative electrode materials of waste lithium-ion batteries through wet sieving to obtain under-sieved materials with a particle size of less than 0.075mm;

[0030] 3) After the product under the wet sieve is filtered and dried, take 40 g and put it into a Hastelloy grinder for grinding for 5 minutes;

[0031] 4) The ground...

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Abstract

The invention discloses a method for separating lithium cobalt oxides and graphite from a waste lithium ion battery electrode material. The method comprises the following steps that (1) the waste lithium ion battery mixed anode and cathode material is screened, and an undersize material is obtained; (2) the undersize material enters ore grinding equipment after being subjected to filtering and drying, and an ore ground product is obtained; and (3) the ore ground product enters a flotation machine for reverse flotation separation and enrichment, namely the first-stage flotation, lithium cobalt oxide concentrate is a sediment, a float enters crushing equipment to be treated after being subjected to filtering and drying, then second-stage flotation is conducted, floats obtained through the second-stage flotation are graphite tailings, and lithium cobalt oxide middling is a sediment and returned to the ore grinding equipment in the step (2) for ore grinding flotation again. Through the method, the lithium cobalt oxides with the grade being 92.56% and the graphite product with the grade being 83.67% can be obtained, and the method has the advantages of being high in handling capacity, mature in equipment technology, low in cost investment and free of poisonous gas and wastewater and is a good choice for industrial application.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste lithium ion batteries, and in particular relates to a method for separating lithium cobaltate and graphite from electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, low self-discharge rate, small size and light weight. They have replaced nickel-metal hydride batteries and nickel-chromium batteries and become the most widely used power supply for mobile electronic devices. The global lithium-ion battery market is estimated to be worth $31.4 billion in 2015 and will reach $53.7 billion by 2020. From 2010 to 2016, the annual output of lithium-ion batteries in my country also increased year by year, from 2.687 billion to 7.842 billion. Due to the limited cycle life, the number of discarded lithium-ion batteries has risen sharply, and billions of batteries will be scrapped every...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00H01M10/54
Inventor 何亚群王景伟余嘉栋李红谢卫宁张涛
Owner CHINA UNIV OF MINING & TECH
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