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Gradient type monocrystal-like positive electrode material and preparation method thereof

A positive electrode material and gradient technology, which is applied in the field of gradient type single-crystal-like positive electrode materials and their preparation, can solve the disadvantages of single-crystal ternary materials and other problems, and achieve stable results, easy industrialization, and high electrical conductivity.

Inactive Publication Date: 2019-07-02
GEM WUXI ENERGY MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, positive electrode materials can be divided into different types of materials such as single crystal and secondary particles in terms of morphology; single crystal has higher safety and better cycle advantages than secondary particles; however, single crystal structure The conduction path of lithium ions is longer than that of secondary particles, so in terms of rate performance, single crystal ternary materials have obvious disadvantages

Method used

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  • Gradient type monocrystal-like positive electrode material and preparation method thereof
  • Gradient type monocrystal-like positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0041] An embodiment of the present invention provides a gradient-type single-crystal-like positive electrode material whose general chemical formula is Li 1.04 Ni 0.6 co 0.2 mn 0.21 Si 0.01 o 2.04 .

[0042] Its preparation method is implemented through the following steps:

[0043] Step 1, using the co-precipitation method to prepare the gradient ternary precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 ;

[0044] Step 1.1, add ultrapure water into the reaction kettle and stir for 1-2 hours, then add ammonia water with a mass concentration of 10-20%, control the concentration of ammonia water at 0.5-1.0mol / L, and pass in argon protection to control the reaction kettle The temperature inside is raised to 50-100°C, then sequentially add nickel-cobalt-manganese salt mixed solution and 3-6mol / L sodium hydroxide solution into the reaction kettle, stir until the pH value is 11-13, and obtain a mixed solution ;

[0045] Wherein, the molar ratio of nickel, cobalt, and manganese salt...

Embodiment 2

[0056] An embodiment of the present invention provides a gradient-type single-crystal-like positive electrode material whose general chemical formula is Li 1.08 Ni 0.6 co 0.2 mn 0.22 Si 0.02 o 2.08 .

[0057] Its preparation method is implemented through the following steps:

[0058] Step 1, using the co-precipitation method to prepare the gradient ternary precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 ;

[0059] Step 1.1, add ultrapure water into the reaction kettle and stir for 1-2 hours, then add ammonia water with a mass concentration of 10-20%, control the concentration of ammonia water at 0.5-1.0mol / L, and pass in argon protection to control the reaction kettle The temperature inside is raised to 50-100°C, then sequentially add nickel-cobalt-manganese salt mixed solution and 3-6mol / L sodium hydroxide solution into the reaction kettle, stir until the pH value is 11-13, and obtain a mixed solution ;

[0060] Wherein, the molar ratio of nickel, cobalt, and manganese salt...

Embodiment 3

[0071] An embodiment of the present invention provides a gradient-type single-crystal-like positive electrode material whose general chemical formula is Li 1.12 Ni 0.6 co 0.2 mn 0.23 Si 0.03 o 2.12 .

[0072] Its preparation method is implemented through the following steps:

[0073] Step 1, using the co-precipitation method to prepare the gradient ternary precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 ;

[0074] Step 1.1, add ultrapure water into the reaction kettle and stir for 1-2 hours, then add ammonia water with a mass concentration of 10-20%, control the concentration of ammonia water at 0.5-1.0mol / L, and pass in argon protection to control the reaction kettle The temperature inside is raised to 50-100°C, then sequentially add nickel-cobalt-manganese salt mixed solution and 3-6mol / L sodium hydroxide solution into the reaction kettle, stir until the pH value is 11-13, and obtain a mixed solution ;

[0075] Wherein, the molar ratio of nickel, cobalt, and manganese salt...

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Abstract

The invention discloses a gradient type monocrystal-like positive electrode material and a preparation method thereof. The general chemical formula of the gradient type monocrystal-like positive electrode material is LiNixCoyMn (1-x-y) AnO2, wherein 0.5<=x<=0. 8, 0.1<=y<=0.2, 0<=n<=0. 3. The gradient type ternary precursor NixCoyMn (1-x-y) (OH)2 is prepared by the method. The change of the concentration of the added nickel salt solution, the cobalt salt solution and the manganese salt solution is controlled to gradually reduce the nickel content and gradually increase the cobalt and manganesecontent in the components from the core to the surface of the precursor, and the particle size of the precursor is controlled to be 2-5um. The step-by-step sintering mode is used and beneficial to theindustrial production and can reduce the inconsistency of the obtained product. Finally, the obtained gradient type monocrystal-like lithium nickel cobalt manganate positive electrode material has good discharge performance and cycle performance at the high voltage of 4.5V.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a gradient type single-crystal-like positive electrode material and a preparation method thereof. Background technique [0002] With its high working voltage, low self-discharge effect and good cycle performance, lithium-ion batteries are widely used in communications, portable computers and electronic energy storage devices; It is one of the short boards of pure electric vehicles, so it is imminent to increase the capacity of positive electrode materials, especially for the higher energy density of lithium ion battery positive electrode materials. Therefore, it is necessary to develop new lithium ion battery positive electrode materials. [0003] At present, positive electrode materials can be divided into different types of materials such as single crystal and secondary particles in terms of morphology; single crystal has higher safety and better cycle...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525H01M10/42H01M4/36
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/4235Y02E60/10
Inventor 许开华惠科石徐世国张文艳周晓燕张明龙李新章
Owner GEM WUXI ENERGY MATERIAL CO LTD
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