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Method for fabricating NCA precursor by lithium circulation

A precursor, lithium sulfate technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as heavy metal ion pollution, achieve the effect of improving reaction efficiency, reducing operating costs, optimizing morphology and stability

Active Publication Date: 2019-03-12
SICHUAN UNION SHINE NEW ENERGY SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies in the background technology, and the technical problem to be solved is: to provide a kind of lithium hydroxide as precipitating agent to produce Ni 1-x-y co x Al y (OH) 2 precursor, which filters the mother liquor Li 2 SO 4 Returning to the existing production process of spodumene to lithium hydroxide, it can solve the problem of heavy metal ion pollution caused by effective lithium recycling and waste liquid discharge in the production of NCA precursors

Method used

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  • Method for fabricating NCA precursor by lithium circulation
  • Method for fabricating NCA precursor by lithium circulation
  • Method for fabricating NCA precursor by lithium circulation

Examples

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Embodiment 1

[0040] Take 462.6g of battery-grade nickel sulfate hexahydrate, 50.6g of cobalt sulfate heptahydrate, and 9.72g of aluminum sulfate octadecahydrate, add deionized water, and prepare a 1L solution, which is converted into the total The metal ion concentration is 2mol / l, this is solution A; take 167.8g of battery-grade lithium hydroxide monohydrate, add deionized water, and prepare a 1L solution, the converted lithium hydroxide concentration is 4mol / l, this is solution B . Use a 3L reactor to add solution B to solution A for co-precipitation reaction. The reaction conditions are: stirring intensity: medium, feeding time 30min, reaction time 2h, aging time 60min, reaction temperature 60°C. Vacuum filter while hot, save the filtrate, and return to the lithium hydroxide production system to prepare lithium hydroxide. Take out the filter cake, add 1L of deionized water, stir and wash at 60°C for 30 minutes, vacuum filter, save the filtrate, and use it to prepare lithium hydroxide s...

Embodiment 2

[0042] Take 462.6g of battery-grade nickel sulfate hexahydrate, 50.6g of cobalt sulfate heptahydrate, and 9.72g of aluminum sulfate octadecahydrate. The total metal ion concentration is 1.33mol / l, which is solution A; take 167.8g of battery-grade lithium hydroxide monohydrate, add deionized water, and prepare a 1L solution. The converted lithium hydroxide concentration is 4mol / l, which is Solution B. Use a 5L container as the reactor, add 400ml of deionized water as the bottom water, and continuously feed the two solutions of A and B in parallel flow, the feeding time is 30min, the reaction time is 4h, the aging time is 60min, and the reaction temperature is 90°C. Vacuum filter while hot, save the filtrate, and return to the lithium hydroxide production system to prepare lithium hydroxide. Take out the filter cake, add 1L of deionized water, stir and wash at 60°C for 30 minutes, vacuum filter, save the filtrate, and use it to prepare lithium hydroxide solution next time. Take ...

Embodiment 3

[0044] Take 462.6g of battery-grade nickel sulfate hexahydrate, 50.6g of cobalt sulfate heptahydrate, and 9.72g of aluminum sulfate octadecahydrate, add deionized water, and prepare a 1L solution, which is converted into the total The metal ion concentration is 2mol / l, which is solution A; take 167.8g of battery-grade lithium hydroxide monohydrate, add deionized water, and prepare a 1.5L solution, and the converted lithium hydroxide concentration is 2.67mol / l, which is Solution B. Use a 3L reactor to add solution A to solution B for co-precipitation reaction. The reaction conditions are: stirring intensity: medium, feeding time 30min, reaction time 8h, aging time 60min, reaction temperature 90°C. Vacuum filter while hot, save the filtrate, and return to the lithium hydroxide production system to prepare lithium hydroxide. Take out the filter cake, add 1L of deionized water, stir and wash at 60°C for 30 minutes, vacuum filter, save the filtrate, and use it to prepare lithium h...

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Abstract

The invention discloses a method for fabricating an NCA precursor by lithium circulation. The method comprises the step of co-precipitating lithium hydroxide used as a precipitant, a soluble nickel salt, a cobalt salt and an aluminum saline solution to generate a Ni<1-x-y>Co<x>Al<y>(OH)2 precursor, wherein a filtering mother solution Li2SO4 is returned to the existing production process of preparing the lithium hydroxide by spodumene to generate the lithium hydroxide, and Li<+> is recycled. The method has the main purposes and advantages that sodium hydroxide is used as the precipitant, a complexing agent NH<4+> is not added, the problems of difficulty in precipitant filtering, high sodium-containing impurity and the like are solved, the NCA precursor performance is improved, the precipitation reaction time is reduced to 2-3 hours from original 20-30 hours, and the operation cost is reduced by 10 times or above; the precipitation mother liquid lithium sulfate is returned to the lithiumhydroxide, organic production circulation is achieved, a ternary positive electrode material NCA initially becomes waste-free discharge production, and the method has remarkable environmental benefit.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion battery materials, in particular to a method for cyclically preparing an NCA precursor of a ternary positive electrode material with lithium hydroxide. Background technique [0002] With the rapid development of new energy, high-capacity lithium-ion power batteries have become a hot spot in the development of global new energy production and technology. As the cathode material that affects the key part of lithium battery capacity, it is the focus of current technical research. The ternary high-nickel cathode material NCA has the advantages of large capacity and high voltage platform and has become the current development direction of lithium batteries. The performance of cathode materials is closely related to the performance of cathode material precursors and cannot be separated. Therefore, improving and optimizing the performance of the NCA precursor of the positive electrode material ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/52H01M10/0525
CPCH01M4/483H01M4/523H01M10/0525Y02E60/10
Inventor 赵春阳付烨钟辉
Owner SICHUAN UNION SHINE NEW ENERGY SCI TECH CO LTD
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