Sulfide-coated positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and sulfide technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as hindering electrode preparation, unstable surface structure, and increased battery polarization, so as to improve electrochemical performance and enhance battery life. Chemical properties, the effect of uniform and dense coating layer

Pending Publication Date: 2021-03-05
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has certain problems: 1) The surface structure is unstable: the delithiation of electrode materials starts from the surface layer, and with the charging progress, the surface structure appears excessive delithiation phenomenon, while the layer of high nickel ternary material The structure changes to spinel structure and inert rock salt structure. With the increase of charging times, a thicker inert layer (mainly composed of NiO) is formed on the surface of the material. In addition, the highly oxidative high-valent transition metal ions on the surface have serious interactions with the electrolyte. Side reactions, resulting in increased polarization, increased impedance, and rapid capacity decay of the battery; 2) The problem of residual alkali on the surface of the material: the nickel element in the ternary material is alkaline, and it has a high affinity with air moisture and carbon dioxide. React with the surface of the material to form LiOH, Li 2 CO 3 , that is, "residual alkali", the existence of residual alkali not only affects the electrochemical performance and storage performance of materials, but also hinders the preparation of electrodes and hinders their practical application
Although this method is simple to operate, the effect is poor, and the residual alkali treatment is not thorough enough

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  • Sulfide-coated positive electrode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0068] This embodiment provides a positive electrode material coated with a sulfide which includes a lithium-containing positive electrode material LINI. 0.88 CO 0.1 Mn 0.02 O 2 And a sulfide solid electrolyte cladding layer covering a lithium-containing positive material surface 2 S-P 2 S 5 -ZRO 2 , That is, by Li 2 S, p 2 S 5 Zro 2 Preparation as a raw material, Li 2 S, p 2 S 5 Zro 2 The molar ratio is 75: 20: 5. P 2 S 5 The average particle size is 60 nm, Zro 2 The average particle diameter was 40 nm. Positive material LINI 0.88 CO 0.1 Mn 0.02 O 2 The average particle diameter was 4.0 μm, and the thickness of the sulfide solid electrolyte coating layer was 5 nm.

[0069] This embodiment also provides a method of preparation of the sulfide coated positive electrode material, and the specific method is:

[0070](1) Disperse the positive electrode material in anhydrous ethanol, and continuously introduced into a hydrogen sulfide gas at a rate of 2 l / min, and mix well for 1 h;

...

Embodiment 2

[0076] This embodiment provides a positive electrode material coated with a sulfide which includes a lithium-containing positive electrode material LINI. 0.88 CO 0.1 Mn 0.02 O 2 And a sulfide solid electrolyte cladding layer covering a lithium-containing positive material surface 2 S-P 2 S 5 -ZRO 2 , That is, by Li 2 S, p 2 S 5 Zro 2 Preparation as a raw material, Li 2 S, p 2 S 5 Zro 2 The mole percentage is 80: 15: 5. P 2 S 5 The average particle size is 60 nm, Zro 2 The average particle diameter was 60 nm. Positive material LINI 0.88 CO 0.1 Mn 0.02 O 2 The average particle diameter is 4.0 μm, and the thickness of the sulfide solid electrolyte coating is 15 nm.

[0077] This embodiment also provides a method of preparation of the sulfide coated positive electrode material, and the specific method is:

[0078] (1) Disperse the positive electrode material in anhydrous ethanol, and continuously introduced into a hydrogen sulfide gas at a rate of 2 l / min, and mix well for 1 h;

[0...

Embodiment 3

[0084] This embodiment provides a positive electrode material coated with a sulfide, and the sulfide coated positive material comprises a lithium positive electrode material Li 0.9 Ni 0.8 CO 0.15 Al 0.05 O 2 And a sulfide solid electrolyte cladding layer covering a lithium-containing positive material surface 2 S-P 2 S 5 -Fes 2 , That is, by Li 2 S, p 2 S 5 FES 2 Preparation as a raw material, Li 2 S, p 2 S 5 FES 2 The mole percentage is 70: 25: 5. P 2 S 5 The average particle size is 100 nm, FES 2 The average particle diameter was 30 nm. Positive material LI 0.9 Ni 0.8 CO 0.15 Al 0.05 O 2 The average particle diameter is 10.0 μm, the thickness of the sulfide solid electrolyte coating is 50 nm.

[0085] This embodiment also provides a method of preparation of the sulfide coated positive electrode material, and the specific method is:

[0086] (1) Dispersion of the positive electrode material in the inert reactor in diethyl ether, continuously at a rate of 1 l / min, and mix thirat...

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Abstract

The invention provides a sulfide-coated positive electrode material, a preparation method thereof and a lithium ion battery. The sulfide-coated positive electrode material comprises a lithium-containing positive electrode material and a sulfide coating layer coating the surface of the lithium-containing positive electrode material, and the lithium-containing positive electrode material comprises aternary material. The preparation method comprises the following steps: 1) mixing a lithium-containing positive electrode material with a solvent and reacting with a sulfur source to obtain a positive electrode material with lithium sulfide on the surface; and 2) mixing the positive electrode material with lithium sulfide on the surface with other raw materials, and carrying out heat treatment toobtain the sulfide-coated positive electrode material. The sulfide-coated positive electrode material provided by the invention solves the problems of residual alkali on the surface of a ternary positive electrode material and unstable surface structure, and has the characteristics of good surface structure stability, high ionic conductivity, low interface impedance, low residual alkali and excellent cycling stability.

Description

Technical field [0001] BACKGROUND OF THE INVENTION 1. Field of the invention relates to a positive electrode material and a preparation method thereof and a lithium ion battery, and more particularly to a sulfide coated positive material and a preparation method thereof and a lithium ion battery. Background technique [0002] The rechargeable lithium-ion battery has an important position in the development of clean energy in its low cost, high reliability, and long life. It has achieved huge success in consumer electronics, portable equipment and electric vehicles. In addition, as government policies have increasing the requirements of energy density, the development of high-energy density lithium-ion batteries urgently need positive electrode materials with high specific capacity, long cycle and wide working voltage. [0003] Amongylic nickel (nickel content>60%) layered oxide positive material (Lini x CO y Mn 1-x-y O 2 Or lini x CO y Al 1-x-y O 2 ) The cost is low, and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 贾孝波严武渭杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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