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Surface modification method of high-nickel ternary material lithium nickel cobalt manganate

A high-nickel ternary material, nickel-cobalt-lithium manganate technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem that it is not suitable for industrial mass production, the electrochemical performance is not ideal, and the preparation method is complicated. and other problems, to achieve the effect of improving cycle stability and safety, good rate performance and cycle stability, and uniform particle size distribution

Pending Publication Date: 2019-06-21
四川纳创时代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

However, the preparation method of this invention is complicated, and the preparation cycle of the sol-gel method is too long, which is not suitable for large-scale industrial production, and the particle agglomeration is serious, and the electrochemical performance is not ideal.

Method used

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  • Surface modification method of high-nickel ternary material lithium nickel cobalt manganate
  • Surface modification method of high-nickel ternary material lithium nickel cobalt manganate
  • Surface modification method of high-nickel ternary material lithium nickel cobalt manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) According to AlPO 4 The coating amount is 1wt%, and the stoichiometric ratio of Al(NO3)3·9H2O and NH4H2PO4 is weighed and dissolved in 10ml and 20ml of absolute ethanol respectively, and then the two are mixed and stirred for 3 hours.

[0026] (2) Weigh 10g of LiNi0.6Co0.2Mn0.2O2 as the main material and slowly add it into the above mixed liquid, and keep stirring until the ethanol is completely volatilized;

[0027] (3) The obtained product was dried at 80° C. for 12 hours; finally, in an air atmosphere, it was kept at 700° C. in a tube furnace for 6 hours to obtain a high-nickel ternary nickel-cobalt-manganese with a 1wt% aluminum phosphate coating on the surface Cathode material LiNi0.6Co0.2Mn0.2O2.

[0028] The material obtained by the above method was scanned by a scanning electron microscope (SEM); the material was assembled into a battery as a positive electrode material of a lithium-ion battery for electrochemical performance testing, and the obtained test ...

Embodiment 2

[0032] (1) According to Li 3 PO 4 The coating amount is 0.5wt%, and the NH4H2PO4 of stoichiometric ratio is weighed and dissolved in 20ml of absolute ethanol, and stirred for 3 hours (the source of coated lithium comes from the surface residual lithium LiOH, LiNi0.6Co0.2Mn0.2O2 of high-nickel material LiNi0.6Co0.2Mn0.2O2 2 CO 3 ).

[0033] (2) Weigh 10g of LiNi0.6Co0.2Mn0.2O2 as the main material and slowly add it into the above mixed liquid, and keep stirring until the ethanol is completely volatilized;

[0034] (3) The obtained product was dried at 80°C for 12 hours, and finally kept at 600°C in a tube furnace for 6 hours in an air atmosphere to obtain a high-nickel ternary nickel-cobalt with a 0.5wt% lithium phosphate coating on the surface Manganese cathode material LiNi0.6Co0.2Mn0.2O2.

[0035] The material obtained by the above method was scanned by a scanning electron microscope (SEM); the material was assembled into a battery as a positive electrode material of a l...

Embodiment 3

[0037] (1) According to Co 3 (PO 4 ) 2 The coating amount is 1wt%, and the stoichiometric ratio of Co(NO3 ) 2 ·6H 2 O and NH4H2PO4 were dissolved in 10ml and 20ml of absolute ethanol respectively, and then the two were mixed and stirred for 3 hours.

[0038] (2) Weigh 10g of LiNi0.6Co0.2Mn0.2O2 as the main material and slowly add it into the above mixed liquid, and keep stirring until the ethanol is completely volatilized;

[0039] (3) The obtained product was dried at 80° C. for 12 hours, and finally kept at 750° C. in a tube furnace for 5 hours in an air atmosphere to obtain a high-nickel ternary nickel-cobalt-manganese with a 1wt% cobalt phosphate coating layer on the surface Cathode material LiNi0.6Co0.2Mn0.2O2.

[0040] The material obtained by the above method was scanned by a scanning electron microscope (SEM); the material was assembled into a battery as a positive electrode material of a lithium ion battery for electrochemical performance testing, and the test co...

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Abstract

The invention discloses a surface modification method of a high-nickel ternary material lithium nickel cobalt manganate. The surface modification method comprises the following steps of (1) accordingto a preset coating material and a coating amount, weighing nitrate and ammonium dihydrogen phosphate based on stoichiometric ratio, and dissolving nitrate and ammonium dihydrogen phosphate in a proper amount of absolute ethyl alcohol; (2) weighing a certain amount of main material, slowly adding into the mixed solution, and performing stirring for a certain time until the absolute ethyl alcohol is completely volatilized; and (3) carrying out drying on the prepared product at a certain temperature for several hours, and putting the dried product into a tubular furnace, and carrying out calcining for several hours at a certain temperature in an air atmosphere, and then carrying out grinding and sieving treatment to obtain the product. According to the surface modification method provided bythe invention, absolute ethyl alcohol is used as a solvent, and phosphate coating is carried out on NCM622 by adopting a wet chemistry method, so that the prepared lithium ion battery ternary positive electrode material is uniform in particle size distribution, clear in particle boundary, and relatively high in secondary particle spherical structure, and has high rate performance and cycling stability.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for surface modification of nickel-cobalt lithium manganese oxide, a high-nickel ternary material. Background technique [0002] With the progress of society and the improvement of people's living standards, the number of cars worldwide is increasing, burning a large amount of fossil fuels such as oil, causing serious environmental pollution problems. Therefore, the development of electric vehicles has become a common goal of the world. Target. One of the current core problems of China's new energy vehicles is insufficient cruising range, and the root cause lies in battery technology. The positive electrode material is the short board of battery energy, and improving the specific capacity of the positive electrode material is the best way to increase the energy density of the battery. Therefore, the use of high-capacity ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 叶飞
Owner 四川纳创时代新能源科技有限公司
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