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A kind of preparation method of lithium-supplementing pole sheet of silicon carbon negative electrode

A silicon-carbon and lithium-replenishing technology, applied in electrode manufacturing, battery electrodes, structural parts, etc., can solve problems such as low Coulomb efficiency, reduce battery energy density and performance, etc. The effect of improving processing stability

Active Publication Date: 2022-04-22
SHAANXI J&R FIRE FIGHTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the SEI film, the first irreversible Coulombic efficiency is low, which reduces the energy density and performance of the battery.

Method used

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  • A kind of preparation method of lithium-supplementing pole sheet of silicon carbon negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of lithium supplement mixture slurry: Add 100g of lithium metal powder, 100g of silicon, 50g of graphite and 20g of carbon nanotubes into the reactor, add 100g of difluorochloromethane, and replace the air in the reactor with carbon dioxide gas. The temperature is 40°C and the pressure is 3MPa, so that carbon dioxide is transformed into a supercritical state. After 2 hours of reaction, a lithium supplement mixture is formed; add the above mixture to 500ml of PVDF NMP glue with a solid content of 7%, and disperse at a low speed for one hour , forming a lithium supplement slurry. Wherein, the particle diameter (D50) of the lithium metal powder is 90 microns, and the particle diameter (D50) of the silicon powder is 45 microns.

[0029] Preparation of lithium-supplemented pole pieces: at room temperature, according to the weight ratio, dry-mix 970g of silicon-carbon negative electrode materials and 30g of conductive agent to obtain mixed powder; add 3L of NMP gl...

Embodiment 2

[0037] Same as Example 1, except that the reaction conditions for the preparation of the lithium supplement mixture are a temperature of 60° C., a pressure of 6 MPa, and a reaction time of 4 hours.

Embodiment 3

[0039] Same as Example 1, except that the reaction conditions for the preparation of the lithium-replenishing mixture are 80° C., 10 MPa pressure, and 8 hours of reaction.

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Abstract

The invention discloses a method for preparing a lithium-replenishing pole piece for a silicon-carbon negative electrode. The method comprises protecting and dispersing lithium powder, silicon powder, a carbon source and a conductive agent in a supercritical fluid atmosphere to prepare a lithium-replenishing mixture, and the negative electrode active material, The ratio and dispersion process of the lithium supplement material and the conductive agent; the negative electrode slurry is coated on the negative electrode current collector to obtain the negative electrode sheet. In the preparation method of the present invention, the lithium-supplementing mixture is placed in a supercritical fluid atmosphere, which reduces the occurrence of agglomeration, improves the processing stability of the slurry, and improves the electrical conductivity by nearly two times compared with the pole piece prepared by a common lithium-supplementing process.

Description

technical field [0001] The invention relates to the preparation of lithium-ion battery negative pole pieces, in particular to a lithium-supplementing slurry and a preparation method thereof, and a negative pole piece prepared by using the lithium-supplementing slurry. Background technique [0002] Lithium-ion batteries have been widely used in people's daily life, ranging from mobile phones, laptops, cameras and other portable consumer electronic devices, to new energy electric vehicles, aerospace and energy storage systems, etc. Capacity, high voltage, no memory effect, environmental protection and pollution-free and many other advantages make it replace a variety of traditional batteries, and can contribute to a wider space and field. [0003] During the first charging and discharging process of the liquid lithium-ion battery, the electrode material and the electrolyte react at the solid-liquid phase interface to form a passivation layer covering the surface of the electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M4/04H01M4/1393H01M4/1395
CPCY02E60/10
Inventor 胡琪卉张琦凌彬
Owner SHAANXI J&R FIRE FIGHTING CO LTD
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