Pre-lithiated silicon-oxygen negative electrode material as well as preparation method and application thereof

A technology for pre-lithiation of silicon oxide and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problem of first-time coulombic efficiency reduction, achieve excellent battery life, high surface density, and accelerate pre-lithiation time Effect

Inactive Publication Date: 2021-06-01
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pre-lithiation is to introduce exogenous lithium into the battery system in a suitable manner and form to improve the first coulombic efficiency reduction caused by the consumption of effective lithium by the silicon-oxygen negative electrode

Method used

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  • Pre-lithiated silicon-oxygen negative electrode material as well as preparation method and application thereof
  • Pre-lithiated silicon-oxygen negative electrode material as well as preparation method and application thereof
  • Pre-lithiated silicon-oxygen negative electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0064] According to the method for preparing a pre-lithiated silicon-oxygen negative electrode material according to an embodiment of the present invention, the silicon-based negative electrode particles with a particle size of micron are soaked in a solution using a Li-biphenylmethyl derivative compound as a chemical pre-lithiation reagent , the lithium ions in the composite contact with the silicon-oxygen negative electrode particles to form a pre-lithiated silicon-oxygen negative electrode material with artificial SEI film on the surface and lithium intercalation inside. Since the operation object of this pre-lithiation process is micron-sized silicon-oxygen negative electrode particles, in the chemical pre-lithiation process, the formation of artificial SEI film on the surface and the formation of silicon-oxygen particles can be completed quickly after contacting the liquid-phase pre-lithiation reagent. Lithium intercalation phase, to achieve the purpose of pre-lithiation. ...

Embodiment 1

[0077] In the glove box, lithium flakes were added to a 0.5 mol / L solution of 4,4'-dimethylbiphenyl (4,4'-DMBP) in methyl butyl ether, where Li was mixed with 4, The molar ratio of 4'-DMBP was set at 4:1, and the Li-4,4'-DMBP complex was obtained by stirring thoroughly, which was used as a chemical pre-lithiation reagent.

[0078] Put the silicon oxide negative electrode particles with a D50 of 10 μm into the above chemical pre-lithiation reagent, according to the Li-4,4’-DMBP complex and SiO x The molar ratio of 2.5:1 was added to the pre-lithiation reagent to add silicon-oxygen negative electrode particles.

[0079] At a temperature of 35°C, the pre-lithiation holding time is 30 minutes, the pre-lithiated silicon oxide negative electrode particles are separated from the pre-lithiated reagent by filtration, washed with propylene carbonate, and dried at 80°C to obtain the pre-lithiated silicon oxide negative electrode Material.

[0080] After mixing the above-mentioned pre-l...

Embodiment 2

[0083] The difference from Example 1 is that the aromatic hydrocarbon used is 4-methylbiphenyl (4-MBP), and the other contents are the same as in Example 1.

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Abstract

The invention discloses a pre-lithiated silicon-oxygen negative electrode material as well as a preparation method and application thereof. The method comprises the steps of (1) mixing a biphenyl methyl derivative with a first organic solvent to obtain a biphenyl methyl derivative solution; (2) mixing metal lithium with the biphenyl methyl derivative solution to obtain a Li-biphenyl methyl derivative compound; and (3) mixing silicon monoxide particles with the Li-biphenylmethyl derivative compound, carrying out pre-lithiation, and carrying out solid-liquid separation so as to obtain the pre-lithiated silicon-oxygen negative electrode material. Micron-sized silicon-based negative electrode particles are soaked in a solution with the Li-biphenylmethyl derivative compound as a chemical pre-lithiation reagent, lithium ions in the compound make contact with the silicon-oxygen negative electrode particles, and the pre-lithiated silicon-oxygen negative electrode material with the surface coated with an artificial SEI film and lithium embedded inside is formed.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a pre-lithiated silicon-oxygen negative electrode material and a preparation method and application thereof. Background technique [0002] As the current consumer market has higher and higher requirements for the cruising range and energy consumption per unit mileage of electric vehicles, the research and development of power batteries is increasingly striving towards high energy density. From the perspective of materials, the means to increase the energy density of the battery mainly include: increasing the specific capacity of the positive electrode material, increasing the working voltage of the positive electrode material, and increasing the specific capacity of the negative electrode and negative electrode. Among them, the improvement of the specific capacity of the negative electrode material is a practical means. The specific capacity that the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/628H01M10/0525H01M2004/021H01M2004/027H01M2220/20Y02E60/10
Inventor 邱昭政李文龙赵育松梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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