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Cobalt-free positive electrode material and preparation method and application thereof

A cathode material and matrix material technology, applied in the field of cobalt-free cathode materials and their preparation, can solve the problems of complex process and long preparation period, and achieve the effects of improving ion diffusion, small effect floating, and reducing surface impedance

Inactive Publication Date: 2021-11-26
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated process and long preparation cycle, and it still has certain limitations for the quantitative production of cobalt-free single crystal cathode materials.

Method used

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  • Cobalt-free positive electrode material and preparation method and application thereof
  • Cobalt-free positive electrode material and preparation method and application thereof
  • Cobalt-free positive electrode material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0043] This embodiment provides a cobalt-free positive electrode material, the cobalt-free positive electrode material includes a cobalt-free substrate and a coating layer coated on the surface of the cobalt-free substrate; the cobalt-free substrate is a cobalt-free substrate material, and the cobalt-free substrate The chemical formula of the material is LiNi 0.55 mn 0.45 o 2 ; The cladding layer is LiTaSiO 5 , LiTaSiO 5 Accounting for the mass proportion of the cobalt-free cathode material is 1%.

[0044] The preparation method of the cobalt-free positive electrode material is as follows:

[0045] (1) Cobalt-free matrix material LiNi was prepared based on the above-mentioned embodiment 0.55 mn 0.45 o 2 :

[0046] Among them, the lithium source is Li 2 CO 3 , the precursor is Ni 0.55 mn 0.45 (OH) 2 , the rotating speed is 800rpm, the mixing time is 15min, the roasting temperature is 1000°C, the roasting time is 12h, the roasting atmosphere is air atmosphere, and t...

Embodiment 2

[0049] This embodiment provides a cobalt-free positive electrode material, the cobalt-free positive electrode material includes a cobalt-free substrate and a coating layer coated on the surface of the cobalt-free substrate; the cobalt-free substrate is a cobalt-free substrate material, and the cobalt-free substrate The chemical formula of the material is LiNi 0.7 mn 0.3 o 2 ; The cladding layer is LiTaSiO 5 , LiTaSiO 5 The mass proportion of the cobalt-free cathode material is 0.1%.

[0050] The preparation method of the cobalt-free positive electrode material is as follows:

[0051] (1) Cobalt-free matrix material LiNi was prepared based on the above-mentioned embodiment 0.7 mn 0.3 o 2 :

[0052] Among them, the lithium source is Li 2 CO 3 , the precursor is Ni 0.7 mn 0.3 (OH) 2 , the rotating speed is 900rpm, the mixing time is 5min, the roasting temperature is 950°C, the roasting time is 15h, the roasting atmosphere is an oxygen atmosphere, and the sieve mesh i...

Embodiment 3

[0055] This embodiment provides a cobalt-free positive electrode material, the cobalt-free positive electrode material includes a cobalt-free substrate and a coating layer coated on the surface of the cobalt-free substrate; the cobalt-free substrate is a cobalt-free substrate material, and the cobalt-free substrate The chemical formula of the material is LiNi 0.9 mn 0.1 o 2 ; The cladding layer is LiTaSiO 5 , LiTaSiO 5 The mass proportion of the cobalt-free cathode material is 0.3%.

[0056] The preparation method of the cobalt-free positive electrode material is as follows:

[0057] (1) Cobalt-free matrix material LiNi was prepared based on the above-mentioned embodiment 0.9 mn 0.1 o 2 :

[0058] Among them, the lithium source is LiOH, and the precursor is Ni 0.9 mn 0.1 (OH) 2 , the rotation speed is 860rpm, the mixing time is 10min, the roasting temperature is 800°C, the roasting time is 14h, the roasting atmosphere is an oxygen atmosphere, and the sieve mesh is 4...

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Abstract

The invention provides a cobalt-free positive electrode material and a preparation method and application thereof. The cobalt-free positive electrode material comprises a cobalt-free substrate and a coating layer coating the surface of the cobalt-free substrate, the cobalt-free matrix comprises a cobalt-free matrix material, the chemical formula of the cobalt-free matrix material is LiNixMnyO2, x is more than or equal to 0.45 and less than or equal to 0.95, y is more than or equal to 0.05 and less than or equal to 0.55, and x + y is equal to 1; and the coating layer comprises LiTaSiO5. The LiTaSiO5 is coated on the surface of the cobalt-free positive electrode base material, so that the surface impedance of the material is reduced, the ion diffusion of the material is improved, the conductivity of the material is obviously improved, and the rate capability of the cobalt-free positive electrode material is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a cobalt-free positive electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for lithium-ion power batteries are getting higher and higher. Among the four main materials of lithium-ion batteries, cathode materials play a vital role. Among the current cathode materials, ternary cathodes are widely used due to their high capacity, voltage, and cycle stability. However, the price of the ternary cathode material is higher because it has a certain amount of cobalt element. Therefore, it is necessary to reduce the cobalt content to reduce the cost of cathode materials. Cobalt-free layered cathode LiNi x mn 1-x o 2 It has attracted attention because of its low cost advantage. However, cobalt-free cathode materials have poor conductivity and slow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01G53/00C01B33/20
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525C01G53/44C01B33/20C01P2004/80C01P2004/03H01M2004/021H01M2004/028Y02E60/10
Inventor 乔齐齐王鹏飞施泽涛郭丰李子郯杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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