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Preparation method of one-pot method double-coated lithium ion battery NCM ternary positive electrode material

A technology of lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as safety and capacity attenuation, and achieve the effects of improving economic benefits, low prices, and improving electrochemical performance

Inactive Publication Date: 2020-09-22
湖南金富力新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Different from the traditional lithium cobalt oxide (LCO) and lithium iron phosphate (LFP) cathode materials for lithium-ion batteries, the layered ternary nickel-cobalt-manganese (NCM) cathode material exhibits a higher specific capacity, in which as the main capacity contribution With the increase of the proportion of Ni ions, NCM materials will also face higher risks of safety and capacity fading

Method used

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  • Preparation method of one-pot method double-coated lithium ion battery NCM ternary positive electrode material
  • Preparation method of one-pot method double-coated lithium ion battery NCM ternary positive electrode material
  • Preparation method of one-pot method double-coated lithium ion battery NCM ternary positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1, 1g of Li(Ni) before coating 0.5 co 0.2 mn 0.3 )O 2 (Such as figure 1 Shown) is dispersed in 140ml water and 60ml ethanol mixed solvent;

[0031] Step 2, choose TiO 2 As the oxide coating layer, slowly add 0.64g resorcinol, 0.96ml formaldehyde, 0.64ml ethylenediamine, 3ml ammonia water and 0.3ml tetrabutyl titanate at a speed of 300r / min while stirring, and stir for 6h. C in an alkaline environment 16 h 36 o 4 Hydrolysis of Ti to form nano-TiO 2 The layer is coated on the surface of the ternary material, and resorcinol, formaldehyde and ethylenediamine are polymerized to form polybenzoxazine (PB) polymer coated on TiO 2 surface;

[0032] Step 3, after dispersing the filtered material, put it into an oven at 120°C for 10 hours to obtain a TiO 2 and polybenzoxazine PB-coated Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Cathode material.

[0033] Such as figure 2 and 3 As shown in the SEM image and TEM coating on the surface of the material, the coated material a...

Embodiment 2

[0035] Step 1, 1gLi(Ni 0.8 co 0.1 mn 0.1 )O 2 Disperse in 140ml water and 60ml ethanol mixed solvent;

[0036] Step two, choose Al 2 o 3 As the oxide coating layer, slowly add 0.64g of ammonium persulfate, 1ml of pyrrole and 0.3g of aluminum isopropoxide while stirring at a speed of 600r / min, stir for 10h, and the aluminum isopropoxide is hydrolyzed to form nano-Al 2 o 3 Layer coated on the surface of the ternary material, pyrrole under the action of ammonium persulfate to form polypyrrole coated on Al 2 o 3 surface;

[0037] Step 3, after dispersing the filtered material, put it in an oven at 100°C for 5 hours to obtain 2 o3 and polypyrrole-coated Li(Ni 0.8 co 0.1 mn 0.1 )O 2 Cathode material.

[0038] Table 1: Carbon-coated Li(Ni 08 co 01 mn 01 )O 2 Comparison of data before and after

[0039]

[0040]

[0041] As shown in Table 1, carbon-coated Li(Ni 0.8 co 0.1 mn 0.1 )O 2 The specific capacity is significantly improved, the amount of residual a...

Embodiment 3

[0043] Step 1, 1g Li(Ni 0.8 co 0.1 mn 0.1 )O 2 Disperse in 120ml water and 60ml ethanol mixed solvent;

[0044] Step 2, choose SiO 2 As the oxide coating layer, continue to slowly add 0.5g dopamine hydrochloride and 3ml tetraethyl orthosilicate while stirring at a speed of 500r / min, stir for 10h, and tetraethyl orthosilicate is hydrolyzed to form nano-SiO 2 Layer coated on the surface of the ternary material, dopamine hydrochloride under alkaline conditions to form polydopamine coated in SiO 2 surface;

[0045] Step 3, after dispersing the filtered material, put it in an oven at 100°C for 5 hours to obtain a SiO 2 and polydopamine-coated Li(Ni 0.8 co 0.1 mn 0.1 )O 2 Cathode material.

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Abstract

The invention provides a preparation method of one-pot method double-coated lithium ion battery NCM ternary positive electrode material. The preparation method comprises steps: adding raw materials atthe same time, and preparing the NCM ternary positive electrode material with high electrochemical performance by sequentially coating the surface of a ternary material with an oxide and aconductivepolymer through a one-pot method according to the difference of the hydrolysis speed of an organic metal compound and the polymerization speed of a polymer. The ternary material interface is stabilized through oxide coating, lithium ion transmission is facilitated, electron transmission is facilitated through the conductive polymer or the carbon material, the capacity of the material is improved,the safety and stability of the material are improved, the process is simple and convenient, and large-scale popularization is easy.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a preparation method of a one-pot double-coated lithium-ion battery NCM ternary positive electrode material. Background technique [0002] As a member of rechargeable energy storage devices, lithium-ion batteries have become one of the main driving forces to promote the development of the global electric industry, especially the electric vehicle market. In order to partially or completely replace fossil energy in the future, lithium-ion batteries with the lightest metal ions and maximum energy density are the best choice. However, there is still a long way to go to obtain a lithium-ion battery system that not only has high energy density and power, but also is safe and environmentally friendly. The current development focuses on how to obtain stable electrodes and electrode-electrolyte interfaces. [0003] Different from the traditional lithium cobalt oxide (LCO) and lithium ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M4/62H01M4/625H01M10/0525C01P2004/03C01P2004/04C01P2006/40Y02E60/10
Inventor 臧俊宋杰杨亿华
Owner 湖南金富力新能源股份有限公司
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