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Lithium supplementing material and preparation method thereof, negative electrode and lithium ion battery

A lithium-ion battery and lithium-replenishing technology, applied in negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as reducing lithium-replenishing efficiency, forming dendrites, and potential safety hazards, and improving lithium-replenishing efficiency, increasing channels, The effect of avoiding safety hazards

Pending Publication Date: 2021-06-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the lithium-replenishing material is pressed or coated on the surface of the negative electrode material, when the lithium metal is not in contact with the graphite or the lithium-replenishing layer closest to the negative electrode material is consumed, it is easy to form dead lithium, which greatly reduces the lithium-replenishing efficiency, and may also form branches. Crystal, causing a safety hazard

Method used

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  • Lithium supplementing material and preparation method thereof, negative electrode and lithium ion battery

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preparation example Construction

[0050] The preparation method of the negative electrode of the lithium ion battery of the present disclosure has no special requirements, and can be carried out with reference to the prior art. For example, the preparation method of the negative electrode of the lithium ion battery of the present disclosure may include coating the negative electrode slurry containing the negative active material and the binder And / or filled on the negative current collector, dry, calendered or not. The specific operation methods and conditions can be conventional in the art, and there is no special limitation here.

[0051] figure 1 It shows a schematic diagram of the principle of lithium supplementation when the lithium supplementation material of the present disclosure is applied to the negative electrode of a lithium ion battery. When the conductive material 2, such as carbon nanotubes, is partially embedded in the lithium metal particle 1, the conductive material 2 can be wound through the...

Embodiment 1

[0062] In a dry environment at -60°C, add 10g of metal lithium ingot to 25g of simethicone oil and raise the temperature to 200°C. After the metal lithium ingot is completely melted, add 0.1g of polyvinylpyrrolidone and stir until the metal lithium ingot is completely dissolved to obtain the first A dispersion liquid: take 0.05 g of multi-walled carbon nanotubes with a diameter of 10 nm and a length of 50 μm, add 25 g of silicone oil, and stir at 200 ° C until the multi-walled carbon nanotubes are fully dispersed to obtain a second dispersion; under high-speed stirring conditions, the first The second dispersion liquid was slowly added to the first dispersion liquid and mixed uniformly, carbon dioxide gas was introduced, stirring and heating were stopped, and after cooling to room temperature, the solid product was collected and dried to obtain the lithium supplement material A1. It was detected that the average particle diameter of the lithium metal particles was 27.8 μm, and ...

Embodiment 2

[0064] In a dry environment at -60°C, add 10g of metal lithium ingot to 25g of simethicone oil and raise the temperature to 200°C. After the metal lithium ingot is completely melted, add 0.1g of sodium dodecylbenzenesulfonate and stir until the metal lithium Dissolve the ingot completely to obtain the first dispersion; take 0.05 g of multi-walled carbon nanotubes with a diameter of 10 nm and a length of 50 μm, add 25 g of silicone oil, and stir at 200 ° C until the multi-walled carbon nanotubes are fully dispersed to obtain the second dispersion; Under certain conditions, the second dispersion liquid was slowly added to the first dispersion liquid and mixed uniformly, carbon dioxide gas was introduced, stirring and heating were stopped, and after cooling to room temperature, the solid product was collected and dried to obtain lithium-replenishing material A2. It was detected that the average particle diameter of the lithium metal particles was 42.2 μm, and the thickness of the ...

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Abstract

The invention relates to a lithium supplementing material and a preparation method thereof, a negative electrode and a lithium ion battery, the lithium supplementing material comprises metal lithium particles and a conductive material, the conductive material comprises a built-in section embedded in the metal lithium particles and an exposed section located outside the metal lithium particles; and the electronic conductivity of the conductive material is greater than 100s / cm. The lithium supplementing material disclosed by the invention can realize electron conduction between the lithium metal particles and the negative electrode active material through the conductive material, increases an electron conduction channel, is beneficial to lithium ion transmission, realizes a rapid embedding process of lithium ions, and remarkably improves the lithium supplementing efficiency, so that formation of dead lithium is effectively inhibited, and potential safety hazards caused by the fact that dendritic crystals pierce a diaphragm are avoided.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, in particular, to a lithium supplement material, a preparation method thereof, a negative electrode and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy and long cycle life, and have been widely used in various portable electronic devices such as notebook computers and mobile phones. With the increasingly severe energy and environmental problems, countries have higher and higher requirements for energy conservation and emission reduction. Traditional fuel vehicles not only consume oil, a fossil energy with limited reserves, but also cause serious exhaust pollution, so electric vehicles came into being. As the main energy storage unit of electric vehicles, lithium-ion power batteries have received more and more attention, showing good development prospects. As people's requirements for cruising range and driving e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/625H01M4/628H01M4/13H01M10/0525H01M2004/027H01M10/058H01M10/446H01M4/0445H01M4/0459H01M4/62Y02E60/10H01M4/0404H01M4/382H01M2004/021
Inventor 梅日国常晓雅吴子文潘仪
Owner BYD CO LTD
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