Method for preparing olivine type five-element high-entropy lithium battery precursor by recycling lithium battery

A technology of olivine type and precursor, which is applied in the direction of battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of difficult metal recycling, fast capacity decay, and low material capacity, and achieves simplified recycling process, recycling Effects of cost reduction, thermal stability performance and cycle performance improvement

Active Publication Date: 2020-12-18
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention solves the problems of the difficulty in the unified recovery of metals in the positive plates of decommissioned ternary and lithium iron phosphate batteries, the low capacity of traditional lithium battery materials, and the rapid capacity decay.
The present invention solves the problem of complex recycling process by preparing olivine-type five-element high-entropy lithium battery materials, in order to achieve the purpose of improving the safety of ternary materials and the energy density of lithium iron phosphate

Method used

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  • Method for preparing olivine type five-element high-entropy lithium battery precursor by recycling lithium battery
  • Method for preparing olivine type five-element high-entropy lithium battery precursor by recycling lithium battery
  • Method for preparing olivine type five-element high-entropy lithium battery precursor by recycling lithium battery

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Take 100g of retired nickel-cobalt-manganese ternary and 200g of retired iron-lithium cathode sheets respectively and carry out a calcination experiment at 450 °C for 3 h to obtain cathode materials that remove organic matter and carbon;

[0037] (2) adding the positive electrode sheet obtained in the step (1) into a sulfuric acid solution with a sulfuric acid concentration of 0.5 mol / L, the volume of the dilute sulfuric acid solution is 2 L, and the uniform air flow rate is 0.20 m 3 / h, the temperature of the reaction solution is 70°C, and the reaction time is 6h;

[0038] (3) after filtering and washing the filter residue obtained in the step (2), add 1.5 L of phosphoric acid solution with a phosphoric acid concentration of 30 g / L, add 60 g of 30% hydrogen peroxide, and the reaction temperature is 50 ° C. After the reaction for 5 h, five kinds of liquids in the solution were adjusted. ion concentration such that c(Fe 3+ ): c(Al 3+ ):c(Ni 2+ ):c(Co 2+ ):c(Mn 2...

Embodiment 2

[0041] (1) 60g decommissioned nickel-cobalt-manganese ternary and 240g decommissioned iron-lithium cathode sheets were respectively taken for 1 h roasting experiment at 700 °C to obtain cathode materials with removal of organics and carbon;

[0042] (2) adding the positive electrode sheet obtained in the step (1) into the acetic acid solution with a hydrochloric acid concentration of 4.0 mol / L, the volume of the dilute acetic acid solution is 0.6 L, and the uniform air flow rate is 0.10 m 3 / h, the temperature of the reaction solution is 150°C, and the reaction time is 4h;

[0043] (3) after filtering and washing the filter residue obtained in the step (2), add 2.0 L of phosphoric acid solution with a phosphoric acid concentration of 60 g / L, add 150 g of 30% hydrogen peroxide, and the reaction temperature is 90 ° C. After the reaction for 3 h, five kinds of liquids in the solution were adjusted. ion concentration such that c(Fe 3+ ): c(Al 3+ ):c(Ni 2+ ):c(Co 2+ ):c(Mn 2+ ...

Embodiment 3

[0046] (1) Take 75g of decommissioned nickel-cobalt-manganese ternary and 225g of decommissioned iron-lithium cathode sheets respectively and carry out a roasting experiment at 600 °C for 2 hours, to obtain cathode materials with removal of organics and carbon;

[0047] (2) adding the positive electrode sheet obtained in the step (1) into the hypochlorous acid solution with a hypochlorous acid concentration of 4.0 mol / L, the volume of the diluted hypochlorous acid solution is 0.6 L, and the uniform air flow rate is 0.018 m 3 / h, the temperature of the reaction solution was 80°C, and the reaction time was 6h;

[0048] (3) after filtering and washing the filter residue obtained in step (2), adding 2.2 L of phosphoric acid solution with a phosphoric acid concentration of 40 g / L, adding 100 g of 30% hydrogen peroxide, the reaction temperature is 80 ° C, and adjusting five kinds of solutions in the solution after the reaction for 2 h ion concentration such that c(Fe 3+ ): c(Al 3+...

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Abstract

The invention belongs to the field of lithium battery recycling, and particularly relates to a method for preparing an olivine-type five-element high-entropy lithium battery precursor material by recycling retired lithium batteries. The method comprises the following steps: mixing and roasting retired nickel-cobalt-manganese ternary and lithium iron pole pieces in an air atmosphere; introducing air into the obtained pole piece in dilute acid for reaction to obtain first filtrate and filter residues; adding phosphoric acid and a hydrogen peroxide solution into the filter residues for dissolving, adjusting the pH of the solution after adjusting the concentration of metal ions in the solution, and reacting to generate an olivine type five-element high-entropy lithium battery material precursor; and washing, filtering, washing, drying and roasting the obtained precursor slurry to obtain a five-element high-entropy lithium battery material precursor. According to the method, the retired nickel-cobalt-manganese ternary and lithium iron phosphate positive plates are recycled in a unified manner, so that the retired lithium battery material recycling process is greatly simplified, and theprepared olivine type five-element high-entropy lithium battery precursor material is relatively high in capacity, stable in high-temperature performance and relatively slow in capacity attenuation.

Description

technical field [0001] The invention belongs to the field of lithium battery recycling and reuse, and particularly relates to a method for preparing an olivine-type five-element high-entropy lithium battery precursor material from a retired lithium battery positive electrode sheet. Background technique [0002] In recent years, with the continuous attention and development of new energy vehicles, it has become an inevitable trend to replace traditional vehicles. While new energy vehicles create green travel, they also bring corresponding problems. The lifespan of lithium-ion power batteries, which are the "heart" of new energy vehicles, is only 5 years on average. 120,000-170,000 tons. However, due to the complex structure of lithium-ion power batteries, the high cost of recycling, and the imperfection of the process, recycling has been in a downturn. [0003] At present, the acid-dissolving method is one of the main methods for recovering valuable metal materials in lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M10/54
CPCC01B25/45H01M10/54Y02W30/84
Inventor 鲍维东骆艳华裴晓东李晓祥田然
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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