Method for assisting recovery of lithium and cobalt in waste electrode material through microwave roasting

A technology of microwave roasting and electrode materials, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of low wet leaching efficiency, affecting acid leaching behavior, and hindering leaching reaction, and achieves omitting the need for pre-treatment. Treatment process, simplify the pretreatment process, and improve the effect of solubility

Active Publication Date: 2019-10-18
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, elements such as cobalt and manganese in the electrode material are difficult to dissolve in the solution due to their high valence, resulting in low wet leaching efficiency.
In addition, due to the external heating leaching method adopted in the traditional wet recovery process, the chemical reaction only occurs on the surface of the solid particles, resulting in hindered leaching reaction, slow rate, and difficulty in heat transfer
And the organic binder PVDF contained in the electrode material covers the surface, affecting its acid leaching behavior

Method used

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  • Method for assisting recovery of lithium and cobalt in waste electrode material through microwave roasting
  • Method for assisting recovery of lithium and cobalt in waste electrode material through microwave roasting
  • Method for assisting recovery of lithium and cobalt in waste electrode material through microwave roasting

Examples

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Embodiment 1

[0031] Disassemble the positive and negative electrode sheets after discharging and air-drying the waste lithium cobalt oxide battery, crush and sieve the positive electrode sheet, take materials smaller than 74 microns, and put them into a microwave tube furnace protected by argon gas. Roasted for 20 min under 200W microwave power, and collected the roasted solid phase product. The reduced roasted product was mixed with 1.5mol / L benzenesulfonic acid, the solid-to-liquid ratio was 30g / L, and stirred in a constant temperature water bath at a speed of 500rpm for 60min to prepare an acid leaching solution for waste electrode materials, and the cobalt element was directly recovered in the form of precipitation. Phosphoric acid is added to the filtered leaching solution, lithium ions are precipitated from the solution in the form of precipitation, and the precipitated product of lithium is recovered. The recoveries of cobalt and lithium in this embodiment are 90.5% and 92.8% respec...

Embodiment 2

[0033] Disassemble the positive and negative electrode sheets after discharging and air-drying the waste lithium cobaltate batteries, crush and sieve the positive electrode sheets, take -74 micron materials, and put them into a microwave tube furnace protected by argon gas. Roast for 20 min under 500W microwave power, and collect the solid phase product of roasting. The reduced roasted product was mixed with 1.5mol / L benzenesulfonic acid, the solid-to-liquid ratio was 30g / L, and stirred in a constant temperature water bath at a speed of 500rpm for 60min to prepare an acid leaching solution for waste electrode materials, and the cobalt element was directly recovered in the form of precipitation. Phosphoric acid is added to the filtered leaching solution, lithium ions are precipitated from the solution in the form of precipitation, and the precipitated product of lithium is recovered. The difference between the implementation conditions of this example and Example 1 is that the ...

Embodiment 3

[0035] Disassemble the positive and negative electrode sheets after discharging and air-drying the waste lithium cobaltate batteries, crush and sieve the positive electrode sheets, take -74 micron materials, and put them into a microwave tube furnace protected by argon gas. Roasted at 800W microwave power for 20min, and collected the roasted solid phase product. The reduced roasted product was mixed with 1.5mol / L benzenesulfonic acid, the solid-to-liquid ratio was 30g / L, and stirred in a constant temperature water bath at a speed of 500rpm for 60min to prepare an acid leaching solution for waste electrode materials, and the cobalt element was directly recovered in the form of precipitation. Phosphoric acid is added to the filtered leaching solution, lithium ions are precipitated from the solution in the form of precipitation, and the precipitated product of lithium is recovered. The difference between the implementation conditions of this example and Example 1 and Example 2 is...

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Abstract

The invention discloses a method for assisting recovery of lithium and cobalt in a waste electrode material through microwave roasting. The method comprises the following steps of, step (1), crushingand screening a positive plate to obtain electrode material powder; step (2), putting the obtained positive electrode active material into a microwave tube furnace filled with inert protective gas forroasting, and collecting the roasted solid-phase product; step (3), mixing the solid-phase product with excess organic acid, preparing an acid leaching solution, and recovering cobalt salt precipitate; and step (4), adding any one of phosphoric acid, phosphate or carbonate into the leaching solution, and recovering the precipitate of the lithium. According to the method, the electrode material ispre-reduced in a microwave roasting mode, a binder PVDF plays a role of a reducing agent, the acid leaching characteristic of the lithium and the cobalt in the positive electrode material is optimized, the energy consumption and the gent consumption in the recovery process are reduced, and the pretreatment process is simplified; and the method has the advantages of high efficiency, low energy consumption, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the field of recycling waste lithium ion batteries, and in particular relates to a method for recovering lithium and cobalt in waste electrode materials assisted by microwave roasting. Background technique [0002] Lithium-ion battery, as an efficient and environmentally friendly electric energy carrier, has been widely used in energy storage devices, consumer electronics, and power batteries due to its many advantages such as high energy density, long cycle life, and no memory effect. With the vigorous development of my country's consumer electronics and new energy automobile industries, the demand and output of lithium-ion batteries continue to rise. According to statistics, the national output of lithium batteries reached 12.1 billion in 2018, a year-on-year increase of 22.86%. Generally, lithium-ion batteries are prone to problems such as battery level expansion and capacitance drop after 1-3 years of use, and enter the sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B26/12C22B23/00H01M10/54
CPCC22B7/007C22B1/02C22B26/12C22B23/0415H01M10/54Y02W30/84Y02P10/20
Inventor 何亚群付元鹏谢卫宁李金龙张峰彬
Owner CHINA UNIV OF MINING & TECH
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