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Method for preparing lithium battery positive electrode material by extracting lithium from salt lake brine

A technology of salt lake brine and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost of adsorbents and high dissolution rate of adsorbents, achieve efficient utilization and avoid repeated delithiation dissolution losses , The effect of simplifying the extraction and use process

Inactive Publication Date: 2018-09-28
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for extracting lithium from salt lake brine to prepare lithium battery cathode materials, and solve the defects of high dissolution rate and high cost of the existing adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method of extracting lithium from salt lake brine to prepare lithium battery cathode material, the salt lake brine is subjected to secondary nanofiltration to obtain magnesium lithium concentrated solution, which is dried, and then dispersed in the electrolyte solution of lithium battery to form a high-concentration electrolyte solution; nickel cobalt manganese acid Lithium crystals are delithiated, and lithium is quickly adsorbed in the electrolyte under the action of potential to obtain nickel-cobalt-lithium-manganese oxide ternary electrode materials; specifically, the following steps are included:

[0028] S1 Pass salt lake brine through the first layer of nanofiltration membrane with a pore size of 0.08nm to remove calcium ions, sodium ions, and chloride ions, and pass the filtrate from the first nanofiltration through the second layer of nanofiltration membrane with a pore size of 0.06nm to intercept lithium ions , magnesium ions, remove the filtrate filtered b...

Embodiment 2

[0035] The method of extracting lithium from salt lake brine to prepare lithium battery cathode material, the salt lake brine is subjected to secondary nanofiltration to obtain magnesium lithium concentrated solution, which is dried, and then dispersed in the electrolyte solution of lithium battery to form a high-concentration electrolyte solution; nickel cobalt manganese acid Lithium crystals are delithiated, and lithium is quickly adsorbed in the electrolyte under the action of potential to obtain nickel-cobalt-lithium-manganese oxide ternary electrode materials; specifically, the following steps are included:

[0036] S1 Pass salt lake brine through the first layer of nanofiltration membrane with a pore size of 0.08nm to remove calcium ions, sodium ions, and chloride ions, and pass the filtrate from the first nanofiltration through the second layer of nanofiltration membrane with a pore size of 0.06nm to intercept lithium ions , magnesium ions, remove the filtrate filtered b...

Embodiment 3

[0043] The method of extracting lithium from salt lake brine to prepare lithium battery cathode material, the salt lake brine is subjected to secondary nanofiltration to obtain magnesium lithium concentrated solution, which is dried, and then dispersed in the electrolyte solution of lithium battery to form a high-concentration electrolyte solution; nickel cobalt manganese acid Lithium crystals are delithiated, and lithium is quickly adsorbed in the electrolyte under the action of potential to obtain nickel-cobalt-lithium-manganese oxide ternary electrode materials; specifically, the following steps are included:

[0044] S1 passes salt lake brine through the first nanofiltration membrane to remove calcium ions, sodium ions, and chloride ions, and passes the filtrate from the first nanofiltration through the second nanofiltration membrane to intercept lithium ions and magnesium ions to remove the second nanofiltration membrane. Nanofiltration filtered filtrate;

[0045] S2 Dry ...

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Abstract

The invention relates to a method for preparing a lithium battery positive electrode material by extracting lithium from salt lake brine. Salt lake raw water is subjected to two times of nanofiltration, wherein in first filtration, calcium ions, sodium ions and chloride ions of which the ion diameter is 0.1 nm are removed, and in secondary filtration, lithium ions and magnesium ions of which the ion diameter is 0.072-0.076 nm are intercepted; the intercepted magnesium and lithium concentrated solution is dried and then dispersed into conventional lithium battery electrolyte to form high-concentration electrolyte; and nickel-cobalt lithium manganate crystals are subjected to lithium removal and then quickly adsorb lithium from the electrolyte under the potential effect, drying and burning are conducted, and a nickel-cobalt lithium manganate ternary electrode material is obtained. According to the method, the nickel-cobalt lithium manganate crystals are subjected to lithium removal to serve as an adsorbent, not only is lithium adsorption stable, but also lithium removal does not need to be conducted again by taking the nickel-cobalt lithium manganate crystals obtained after lithium removal as the positive electrode material, the solution loss problem caused by multiple times of lithium removal is avoided, the lithium extraction and using process is simplified, lithium extractionand lithium application are integrated into a whole, and efficient utilization of lithium is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials, in particular to the preparation of lithium battery cathode materials by extracting lithium from salt lake brine and a preparation method. Background technique [0002] Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, stronger discharge capacity, and longer cycle life, but also have an energy storage efficiency of more than 90%. The above characteristics determine the use of lithium-ion batteries in electric vehicles, storage power, etc. Great prospects for development. The key to determining the cost and performance of lithium-ion power batteries lies in the materials. The materials of lithium-ion power batteries determine the development route and operating mode of electric vehicles. Therefore, the key to breaking through the bottleneck of lithium-ion power batteries lies in the solution of material problems. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD