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High-performance lithium-ion battery porous thin-film silicon-based negative electrode material and preparation method thereof

A silicon-based negative electrode material, lithium-ion battery technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems affecting the cycle performance of electrode materials, low conductivity characteristics, etc., to improve the charge-discharge cycle performance, improve Synergy, the effect of enhancing structural stability

Active Publication Date: 2014-10-29
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to adapt to the development trend of lithium-ion batteries, aiming at the serious volume effect of lithium-ion battery high-capacity silicon-based negative electrode materials in the process of electrochemical intercalation and delithiation, which affects the cycle performance of electrode materials, and the low-efficiency of such materials. Conductive properties, under the premise of not introducing conductive agents and binders, provide a preparation method for a new type of high-capacity three-dimensional porous thin-film silicon-based negative electrode material with high reversibility in the charge and discharge process and good cycle performance

Method used

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  • High-performance lithium-ion battery porous thin-film silicon-based negative electrode material and preparation method thereof
  • High-performance lithium-ion battery porous thin-film silicon-based negative electrode material and preparation method thereof
  • High-performance lithium-ion battery porous thin-film silicon-based negative electrode material and preparation method thereof

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Embodiment 1

[0037] The copper foil mesh with a porosity of 98.0%, an average pore diameter of 100 μm, and a thickness of 70 μm was ultrasonically cleaned with acrylic copper, 10% (mass percentage) dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides. . The magnetron sputtering method is adopted, the Si with a purity of 99.99% is used as the target material, the copper foil net collector is used as the substrate, and the background vacuum is 1.0×10 -3 Pa, the working pressure during sputtering is 0.2Pa, the flow rate of argon Ar is 40sccm, the Si target sputtering power is 150W, the revolution speed of the sample table is 15rpm, the sputtering time is 2 hours, and the film thickness obtained by sputtering is 300nm. The obtained three-dimensional porous thin film silicon-based electrode precursor is placed in a box furnace, and heat-treated in a vacuum or inert atmosphere. The heat treatment temperature is 700 ° ...

Embodiment 2

[0040] The copper foam with a porosity of 98.0%, an average pore diameter of 150 μm, and a thickness of 400 μm was ultrasonically cleaned with acetone, 10% (mass percent) dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides. The magnetron sputtering method is used, the Si with a purity of 99.999% is used as the target material, the copper foam current collector is used as the substrate, and the background vacuum is 1.0×10 -4 Pa, the working pressure during sputtering is 0.8Pa, the flow rate of argon Ar is 60sccm, the Si target sputtering power is 300W, the revolution speed of the sample table is 20rpm, the sputtering time is 8 hours, and the film thickness obtained by sputtering is 1.0μm. The obtained three-dimensional porous thin film silicon-based electrode precursor is placed in a box furnace, and heat-treated in a vacuum or an inert atmosphere. The heat treatment temperature is 800 ° C, the heati...

Embodiment 3

[0043] The copper foil mesh with a porosity of 98.0%, an average pore diameter of 50 μm, and a thickness of 50 μm was ultrasonically cleaned with acrylic copper, 10% (mass percentage) dilute hydrochloric acid, distilled water and absolute ethanol in order to remove impurities such as surface oil and surface oxides. . The magnetron sputtering method is adopted, with Si with a purity of 99.998% and Sn with a purity of 99.99% as the target (and Si:Sn=1:1), the copper foil net collector as the substrate, and the background vacuum degree is 2.0× 10 -4 Pa, the working pressure during sputtering is 0.3Pa, the flow rate of argon gas Ar is 40sccm, the sputtering power of Si target is 200W, the sputtering power of Sn target is 25W, the revolution speed of sample table is 18rpm, and the sputtering time is 8 hours. The film thickness obtained by shooting was 3.0 μm. The obtained three-dimensional porous thin film silicon-based electrode precursor is placed in a box furnace, and heat-tre...

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Abstract

Disclosed are a porous thin film silicon-based negative electrode material of a high-performance lithium ion cell and a preparation method thereof. The present invention adopts a three-dimensional porous current collector material, such as a copper foil mesh, a copper wire mesh, foamed copper, or foamed nickel. A magnetron sputtering method is used to form a layer of a silicon thin film or a silicon-metal composite thin film on the copper foil mesh, copper wire mesh, foamed copper, or foamed nickel, and then a three-dimensional porous thin film silicon-based negative electrode material is formed through heat treatment. In the present invention, with the forming of the three-dimensional porous structure and the silicon-metal alloy, and a fine bonding force between the thin film negative electrode material and the three-dimensional porous current collector, the cell prepared using the porous thin film silicon-based negative electrode material has high discharge capacity and initial charge-discharge efficiency, and good cycle performance. The method of the present invention is easy to operate, and has wide application prospect in the field of lithium cell negative electrode.

Description

technical field [0001] The invention relates to a lithium ion negative electrode material with high specific capacity and cycle stability, in particular to a porous film silicon-based negative electrode material and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion battery is known as the ideal energy, green energy and leading power source in the 21st century, showing broad application prospects and potential huge economic benefits. With the advancement of the electronics industry, electric vehicles and aerospace technology, higher requirements are placed on the performance of lithium-ion batteries that provide energy for them. Therefore, in order to achieve breakthroughs in energy density and power density of lithium-ion batteries, the crucial "bottleneck" issue is how to design and develop new electrode materials. [0003] In the research field of lithium-ion batteries, the research focus is on negativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/80
CPCY02E60/122H01M4/661H01M4/808H01M4/1395H01M4/386H01M4/134Y02E60/10
Inventor 刘萍乔永民李辉吴敏昌丁晓阳李杰郑俊军
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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