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Method for recovering positive electrode material waste of lithium ion battery and regenerating positive electrode material of lithium ion battery

A lithium-ion battery and cathode material technology, applied in the recycling and regeneration of lithium-ion battery cathode material waste, can solve the problems of high organic acid price, low process route, and unfound cost, and achieve short leaching time and high reactivity , a wide range of effects

Pending Publication Date: 2019-06-04
宁波行殊新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high price of organic acids leads to an increase in the cost of this method, and the introduction of organic pollutants into the water makes purification difficult; the peroxide reducing agent is unstable and used in large quantities, which is a safety hazard; sodium sulfite is used as a reducing agent, and a large amount of sodium sulfate is produced as a by-product
[0011] In short, up to now, there has not been found a recycling technology for ternary cathode materials of waste power batteries with low cost and short process route.
In addition, core technologies such as efficient extraction of valuable elements from waste ternary materials, restoration of material properties, and harmless treatment of residual substances are particularly lacking.

Method used

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  • Method for recovering positive electrode material waste of lithium ion battery and regenerating positive electrode material of lithium ion battery
  • Method for recovering positive electrode material waste of lithium ion battery and regenerating positive electrode material of lithium ion battery
  • Method for recovering positive electrode material waste of lithium ion battery and regenerating positive electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Take a few pieces of waste lithium-ion secondary batteries for electric vehicles, the chemical formula of the positive electrode active material is LiNi 0.5 co 0.2 mn 0.3 o 2 . Disassemble the battery after immersing the battery in salt water, and dissolve the electrolyte remaining in the pole piece by solvent immersion, dry the pole piece in an oven, and then pyrolyze the binder in the pole piece to obtain the lithium-ion battery positive electrode material waste. Powder (hybrid conductive carbon material).

[0092] Prepare a sulfuric acid solution with a mass percentage of 50%, add stoichiometric reducing agent ethylene glycol, measure 1010mL of acidic solution containing reducing agent in the container; weigh 500.0g of spent positive electrode material powder, and slowly add it to the above container Among them, the solid-to-liquid ratio is about 500g / L. Turn on the stirring and heat the reaction vessel with a water bath, the temperature of the water bath is 95°...

Embodiment 2

[0094] Take two unqualified lithium-ion secondary battery products in the production process, and the chemical formula of the positive electrode active material is LiNi 0.6 co 0.2 mn 0.2 o 2 . Disassemble the battery after immersing the battery in salt water, and dissolve the electrolyte remaining in the pole piece by solvent immersion, dry the pole piece in an oven, and then pyrolyze the binder in the pole piece to obtain the lithium-ion battery positive electrode material waste. Powder (hybrid conductive carbon material).

[0095] Weigh 100.0 g of powder and add it into the reaction vessel. A sulfuric acid solution with a mass percent content of 30% is prepared, and a reducing agent glycerol is added, and the reducing agent has a mass percent content of 5.0%. Slowly add the acidic solution containing the reducing agent into the above reaction vessel, the solid-to-liquid ratio is about 200g / L. At the same time, the stirring was started and the reaction vessel was heated...

Embodiment 3

[0097] Take 1kg of lithium-ion battery positive electrode material waste produced in the material production process, the chemical formula of the positive electrode active material is LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0098] Prepare a sulfuric acid solution with a mass percentage of 50%, add the reducing agent 1,2-pentanediol, the reducing agent has a mass percentage of 10.0%, measure 1000mL of the acidic solution containing the reducing agent in the container; the solid-to-liquid ratio About 1000g / L. Turn on stirring and heat the reaction vessel with a water bath, the temperature of the water bath is 45° C., and cool down after 1 hour of reaction. Filtration to achieve solid-liquid separation to obtain leachate and filter residue respectively. Wash the filter residue several times, collect the washings and mix with the leachate. Take the liquid phase sample, analyze the concentration of nickel, cobalt, manganese and other metal elements by ICP-OES, calculate the leaching r...

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Abstract

The invention discloses a method for recovering positive electrode material waste of a lithium ion battery and regenerating a positive electrode material of the lithium ion battery. The method for recovering the positive electrode material waste of the lithium ion battery comprises the following steps of making the positive electrode material waste of the lithium ion battery react with acidic solution containing a reducing agent, and performing solid-liquid separation after the reaction to obtain leached liquor and filter residues so as to realize leaching of metal elements, wherein the reducing agent contains at least two hydroxyl groups and the two hydroxyl groups are positioned on adjacent carbon atoms respectively; and the method for regenerating the positive electrode material of thelithium ion battery comprises the step of recycling the positive electrode material waste, preparing precursor solution, preparing a target positive electrode material precursor, recovering lithium elements in a liquid phase and preparing a target positive electrode material. The adopted reducing agent is high in reaction activity, green and environment-friendly, through which metal ions which arein a high-valence state and are not easy to dissolve in the positive electrode material waste can be reduced into ions which are in a low-valence state and are easy to dissolve in water; the leachingrecovery process route is short, the cost is low, the leaching rate is high, and the leaching time is short; and based on metal element closed loop circulation, the recovering and regenerating methodcan perform conveniently, and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of battery recycling, in particular to a method for recycling and regenerating lithium-ion battery cathode material waste. Background technique [0002] Since 2017, with the gradual increase in the number of obsolete power batteries and the soaring prices of metals such as cobalt and lithium, the recycling and cascade utilization of power batteries has become a highly concerned link in the new energy industry chain. For the power battery recycling industry, the state has issued many policies and regulations. On July 25, 2018, seven ministries and commissions including the Ministry of Industry and Information Technology and the Ministry of Science and Technology jointly issued the "Notice on Doing a Good Job in the Pilot Work of Recycling Power Batteries for New Energy Vehicles". [0003] According to the research data of EVTank, the demand for power batteries of new energy vehicles will exceed 120Gwh in 202...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00H01M10/54
CPCY02W30/84Y02P10/20
Inventor 郑卓群
Owner 宁波行殊新能源科技有限公司
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