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High nickel positive electrode material with uniform coating layer and preparation method thereof

A technology of positive electrode material and coating layer, which is applied in the field of high nickel positive electrode material and its preparation, can solve the problems of low safety, poor cycle stability, complicated preparation process, etc., and achieve the reduction of production cost and time, safety and stability Guaranteed effect

Inactive Publication Date: 2019-05-10
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the technical defects such as poor cycle stability, low safety and complicated preparation process of existing high-nickel positive electrode materials, and provide a high-nickel positive electrode material with a uniform coating layer and its preparation method

Method used

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  • High nickel positive electrode material with uniform coating layer and preparation method thereof
  • High nickel positive electrode material with uniform coating layer and preparation method thereof
  • High nickel positive electrode material with uniform coating layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Add 200g of deionized water and high-nickel positive electrode active material LiNi into a 1L beaker 0.80 co 0.10 mn 0.10 o 2 200g, stirring speed 300r / min, to be stirred evenly. Add slowly (NH 4 ) 2 HPO 4 2.16g, after stirring evenly, slowly add Ba(NO 3 ) 2 6.27g The stirring speed remains unchanged, and the stirring is preferably continued for 15 minutes. Filter the obtained mixture, filter it with a vacuum water pump, wash it with 20 mL of absolute ethanol, drain it, and dry it in a blast oven at 65°C for 3 hours to obtain a dry material, which is placed in a sagger and heated in a preheated muffle furnace. Sintering reaction at 700°C for 10h under oxygen atmosphere (oxygen concentration ≥ 80%). Cool slowly, crush and sieve to obtain a high-nickel positive electrode material active material with a uniform coating layer.

Embodiment 2

[0077] Add 200g of deionized water and high-nickel positive electrode active material LiNi into a 1L beaker 0.90 co 0.05 mn 0.05 o 2 200g, stirring speed 300r / min, to be stirred evenly. Add slowly (NH 4 ) 2 HPO 4 2.16g, stir well and slowly add MgCl 2 ·6H 2 O4.88g The stirring speed is constant, and the stirring is preferably continued for 15 minutes. Filter the obtained mixture, filter it with a vacuum water pump, wash it with 20 mL of absolute ethanol, drain it, and dry it in a blast oven at 65°C for 3 hours to obtain a dry material, which is placed in a sagger and heated in a preheated muffle furnace. Sintering reaction at 700°C for 10h under oxygen atmosphere (oxygen concentration ≥ 80%). Cool slowly, crush and sieve to obtain a high-nickel cathode material active material LiNi with a uniform coating layer 0.90 co 0.05 mn 0.05 o 2 .

Embodiment 3

[0079] Add 200g of deionized water and high-nickel positive electrode active material LiNi into a 1L beaker 0.80 co 0.10 mn 0.10 o 2 200g, stirring speed 200r / min, to be stirred evenly. Add slowly (NH 4 ) 2 HPO 4 2.16g, after stirring evenly, slowly add Al(NO 3 ) 3 9H 2 O 6.00g The stirring speed remains unchanged, and the stirring is preferably continued for 15 minutes. Filter the obtained mixture, filter it with a vacuum water pump, wash it with 20 mL of absolute ethanol, drain it, and dry it in a blast oven at 65°C for 3 hours to obtain a dry material, which is placed in a sagger and heated in a preheated muffle furnace. Sintering reaction at 700°C for 10h under oxygen atmosphere (oxygen concentration ≥ 80%). Cool slowly, crush and sieve to obtain a high-nickel cathode material active material LiNi with a uniform coating layer 0.80 co 0.10 mn 0.10 o 2 .

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Abstract

The present invention discloses a high-nickel positive electrode material with a uniform coating layer and preparation method thereof. The preparation method comprises following steps: placing a highnickel positive electrode material in water for water washing, adding two or more kinds which can react with each other to generate water-insoluble coating inorganic salt substance, filtering, and rinsing with a low-boiling point organic solvent, pumping out, drying, sintering, cooling, and sieving to obtain a high nickel positive electrode material with the uniform coating layer. Since the coating is coated on surface of an active material through adopting a manner of reacting, stirring, while bonding, the active material can be more uniformly coated; the method reduces residual lithium on the surface of the positive electrode active material while stirring and coating in the water, and provides guarantee on safety and stability for the battery; the method forms a layer of new layered lithium metal oxide structure and a lithium phosphate structure or a lithium sulfate structure on the surface of the positive electrode active material through high temperature sintering, to ensure structural stability of the material while improving a lithium ion migration rate.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel positive electrode material with a uniform coating layer and a preparation method thereof. Background technique [0002] The development of human society has entered the era of intelligent revolution. With the rapid development of information technology and electrical equipment, energy has become an important bottleneck restricting progress and development. Especially with the imminent control of environmental pollution, new energy sources, especially lithium-ion secondary batteries, are playing an increasingly important role in daily life and social progress. A few days ago, major countries around the world have successively announced the timetable for banning the sale of pure fuel vehicles, which also marks that the development of power batteries for electric vehicles has entered a new stage. [0003] Lithium-ion batteries are widely used due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 王尊志袁徐俊佘圣贤孙伟丽
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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