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A modified cathode material, its preparation method and lithium ion battery

A positive electrode material and modification technology, applied in positive electrodes, battery electrodes, secondary batteries, etc., can solve problems such as restricting the development of lithium-ion batteries and reducing the cycle life of lithium-ion batteries.

Active Publication Date: 2020-11-13
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The instability of the structure of the positive electrode material often reduces the cycle life of lithium-ion batteries. At the same time, the problem of the interface between the positive electrode material and the electrolyte is also a bottleneck restricting the development of lithium-ion batteries.

Method used

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  • A modified cathode material, its preparation method and lithium ion battery
  • A modified cathode material, its preparation method and lithium ion battery
  • A modified cathode material, its preparation method and lithium ion battery

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preparation example Construction

[0027] The embodiment of the present invention discloses a preparation method of a modified positive electrode material, comprising the following steps;

[0028] Step S1: forming a vanadium disulfide coating layer on the surface of the positive electrode material;

[0029] Step S2: Grinding and mixing the positive electrode material with a vanadium disulfide coating layer on the surface and the lithium source evenly, and calcining in an oxygen atmosphere to obtain an intermediate product;

[0030] Step S3: The intermediate product is mixed with a fluorine source and then further calcined to obtain a modified positive electrode material.

[0031] The preparation method of the modified positive electrode material is described in detail in accordance with the steps below:

[0032] Step S1: forming a vanadium disulfide coating layer on the surface of the positive electrode material.

[0033] Specifically:

[0034] The positive electrode material, the precursor solution of the s...

Embodiment 1

[0050] (1) Put 5g of nickel-cobalt lithium aluminate in a homogeneous mixed solution of precursors of 5mg / ml thioacetamide and 8mg / ml ammonium metavanadate, at 180°C, hydrothermally react for 12h to form a layer of VS 2 cladding;

[0051] (2) The surface is grown with VS 2 The coating layer of lithium nickel cobalt aluminate and 1.5 times the mole of lithium carbonate are uniformly ground, and then placed in an oxygen atmosphere at 800 ° C for 12 hours at a high temperature to form Li 3 VO 4 cladding;

[0052] (3) will form Li 3 VO 4 The nickel-cobalt-lithium aluminate and 0.1% lithium fluoride in the coating layer are uniformly ground and then placed in a high-temperature tube furnace at 300°C for 12 hours to obtain the modified positive electrode material. In the modified positive electrode material, lithium orthovanadate is coated on the surface of the nickel-cobalt-aluminate lithium, and fluorine is doped in the nickel-cobalt-aluminate lithium and in the surface coati...

Embodiment 2

[0054] (1) 5g lithium nickel cobalt manganese oxide LiN i0.6 co 0.2 mn 0.2 o 2 Place in a homogeneous precursor solution of 10mg / ml thiourea and 8mg / ml ammonium metavanadate, 180°C, hydrothermal reaction for 12h to form a layer of VS 2 cladding;

[0055] (2) The surface is grown with VS 2 Coating layer nickel cobalt lithium manganese oxide and 2 times the mole of lithium acetate are evenly ground and placed in an oxygen atmosphere at 1000°C for 24 hours at high temperature to form Li 3 VO 4 cladding;

[0056] (3) will form Li 3 VO 4 The nickel-cobalt-lithium manganese oxide and 0.5% ammonium fluoride in the coating layer are uniformly ground and calcined in a high-temperature tube furnace at 500°C for 12 hours to obtain the modified positive electrode material. In the modified positive electrode material, lithium orthovanadate is coated on the surface of lithium nickel cobalt manganese oxide, and fluorine is doped in the lithium nickel cobalt manganese oxide and in the ...

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Abstract

The invention relates to the field of batteries, in particular to a modified positive electrode material, a preparation method thereof and a lithium ion battery. According to the modified positive electrode material disclosed by the invention, the surface of the positive electrode material is coated with lithium orthovanadate, and fluorine elements are doped in the positive electrode material anda surface coating layer. When the modified positive electrode material is used for the lithium ion battery, a stable interface can be formed between the modified positive electrode material and an electrolyte, and the cycle performance, the ionic conductivity and the electronic conductivity of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a modified positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] With environmental pollution, a series of problems such as global warming have attracted widespread attention from people all over the world. This is due to the use of fossil fuels that lead to CO 2 Emissions are increasing, and more and more countries are beginning to seek new energy products to gradually replace scarce resources. Among them, lithium-ion batteries are widely used in electronic equipment, electrical appliances, electric vehicles and other fields as efficient, lightweight and portable energy storage devices. The development of lithium-ion batteries has played a great role in improving people's quality of life. [0003] But it is undeniable that the development of lithium batteries has been slowing down in recent years, mainly due to the positive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 袁号李素丽赵伟唐伟超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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