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Preparation method for modifying high nickel ternary positive electrode material through multi-component coating

A positive electrode material and high-nickel technology, which is applied in the field of preparation of high-nickel ternary positive electrode materials modified by multiple coatings, can solve problems such as complex coating modification process, achieve safety and cycle improvement, complete structure, Improves the effect of free lithium

Inactive Publication Date: 2019-04-26
WUXI JEWEL POWER & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the complex defects of the high-nickel ternary coating modification process in the prior art, and to provide a preparation method for the high-nickel ternary positive electrode material modified by multi-component coating

Method used

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  • Preparation method for modifying high nickel ternary positive electrode material through multi-component coating
  • Preparation method for modifying high nickel ternary positive electrode material through multi-component coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, the high-nickel ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 It is 5kg of matrix, mixed with 9.4g of nano-alumina and 24.2g of nano-sized boron oxide, put it into a high-speed mixer and mix evenly, mix at 150rpm for 30 minutes, and then take it out. Put the mixed material into the atmosphere type resistance furnace for low temperature sintering, raise it to 680°C in 1.5 hours, keep it warm for 10 hours, and give the oxygen amount of 0.8m 3 / h. After natural cooling, it was taken out and passed through a 325-mesh sieve to obtain product 1. Do SEM scanning electron microscope (see figure 1 ); At the same time, the half-cell performance test (2.75-4.3V) of the product is carried out at a rate of 0.5C (see figure 2 ).

example 2

[0023] In this example, the high-nickel ternary cathode material LiNi 0.6 co 0.1 mn 0.3 o 2 5kg of the matrix is ​​mixed with 9.4g of nano-sized alumina and 42.8g of nano-sized boric acid, put into a planetary ball mill and mix evenly, and take it out after mixing at 300rpm for 5 minutes. Put the mixed material into the atmosphere type resistance furnace for low temperature sintering, raise it to 660°C in 1.5 hours, keep it warm for 10 hours, and give 0.8m oxygen 3 / h. After natural cooling, it was taken out and passed through a 325-mesh sieve to obtain a modified high-nickel positive electrode material.

example 3

[0025] In this example, the high-nickel ternary cathode material LiNi 0.7 co 0.1 mn 0.2 o 2 5 kg of the base, with 14.4 g of nano-sized aluminum hydroxide and 42.8 g of nano-sized boric acid, put into the oblique mixer and mix evenly, and take it out after mixing at 50 rpm for 60 minutes. Put the mixed material into the atmosphere type resistance furnace for low temperature sintering, raise it to 500°C in 1.5 hours, keep it warm for 10 hours, and give 1.2m oxygen 3 / h. After natural cooling, it was taken out and passed through a 325-mesh sieve to obtain a modified high-nickel positive electrode material.

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Abstract

The invention discloses a preparation method for modifying a high nickel ternary positive electrode material through multi-component coating. The method comprises the following steps that 1), the highnickel ternary positive electrode material LiNixCOyMn1-x-yO2 (x is lager than or equal to 0.6 and less than or equal to 0. 85, and y is lager than or equal to 0.05 and less than or equal to 0.2) as asubstrate, an aluminum-containing coating A and a boron-containing coating B are added, and a mixture is put into a high-speed mixer for uniform mixing; 2), the mixture is subjected to low-temperature oxygen-rich sintering, after the temperature is raised to 350-700 DEG C at a rate of 3-7 DEG C / min, natural cooling is performed for 5-10 hour, and the modified high nickel ternary positive electrode material is obtained through iron removal and sieving. The preparation method for modifying the high nickel ternary positive electrode material through multi-component coating has the advantages that an adopted solid phase method makes the high nickel ternary material uniformly coated by the two metal elements, can effectively improve free lithium in the material, stabilize the crystal structure, and effectively resist a corrosion reaction of a barrier material and an battery electrolyte; the process is simple, the equipment requirements are low, the practicability is strong, and batch production can be achieved.

Description

technical field [0001] The invention relates to a method for preparing a high-nickel ternary positive electrode material modified by multi-element coating, in particular to a preparation method combining solid-phase doping, high-temperature sintering, broken solid-phase coating, and low-temperature sintering. Preparation of high-capacity, excellent cycle high-voltage nickel-cobalt-manganese ternary cathode materials. Background technique [0002] As a new energy industry, lithium-ion batteries have been promoted all over the world. Nickel-cobalt-manganese ternary, as a positive electrode material for lithium-ion batteries, has always been the focus of research and development direction in the industry, and is widely used in digital 3C products, electric vehicles tools, electric vehicles and electric vehicles. With the rapid development of the market in 2018, people put forward higher requirements for lithium batteries, requiring the next generation of battery products to ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李佳军包希文马岩华钱飞鹏赵春阳邓亚烽陆科炯
Owner WUXI JEWEL POWER & MATERIALS
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