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

A technology for silicon-based negative electrode materials and lithium-ion batteries, applied in battery electrodes, electrode carriers/collectors, circuits, etc., can solve problems such as low electrical conductivity and affect the cycle performance of electrode materials, so as to improve synergy and improve charge and discharge Cycle performance, effect of reducing polarization

Active Publication Date: 2012-09-19
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment 1

[0037] The copper foil net with a porosity of 98.0%, an average pore diameter of 100μm and a thickness of 70μm is ultrasonically cleaned with acrylic copper, 10% (mass percentage) dilute hydrochloric acid, distilled water and absolute ethanol to remove surface oil and surface oxides and other impurities . Magnetron sputtering method is adopted, Si with a purity of 99.99% is used as the target, the copper foil net current 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 of argon Ar is 40sccm, the sputtering power of the Si target is 150W, the sample stage revolution speed is 15rpm, the sputtering time is 2 hours, and the thickness of the film obtained by sputtering is 300nm. The obtained three-dimensional porous 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°C, the heating rate is 12°C / mi...

Embodiment 2

[0040] The foamed copper with a porosity of 98.0%, an average pore diameter of 150 μm and a thickness of 400 μm is ultrasonically cleaned with acrylic copper, 10% (mass percentage) dilute hydrochloric acid, distilled water and absolute ethanol to remove surface oil and surface oxides. Magnetron sputtering method is adopted, Si with a purity of 99.999% is used as the target, and the foamed copper current collector is used as the matrix. The background vacuum is 1.0×10 -4 Pa, working pressure during sputtering is 0.8Pa, flow of argon Ar is 60sccm, Si target sputtering power is 300W, sample stage revolution speed is 20rpm, sputtering time is 8 hours, and the film thickness obtained by sputtering is 1.0μm. The obtained three-dimensional porous 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 800°C, the heating rate is 15°C / min, and the holding time is 2 hours. Alloying treatment; the...

Embodiment 3

[0043] The copper foil net with a porosity of 98.0%, an average pore diameter of 50μm and a thickness of 50μm is ultrasonically cleaned with acrylic copper, 10% (mass percentage) dilute hydrochloric acid, distilled water and absolute ethanol to remove 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 material (and Si:Sn=1:1), the copper foil net current collector is the substrate, and the background vacuum degree is 2.0× 10 -4 Pa, the working pressure during sputtering is 0.3Pa, the flow of argon Ar is 40sccm, the sputtering power of Si target is 200W, the sputtering power of Sn target is 25W, the sample stage revolution speed is 18rpm, the sputtering time is 8 hours, and the sputtering The thickness of the film obtained by the injection was 3.0 μm. The obtained three-dimensional porous film silicon-based electrode precursor is placed in a box furnace and heat-treated in a...

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Abstract

The invention discloses a high-performance three-dimensional porous film silicon-based negative electrode material of a lithium ion cell and a preparation method thereof. A three-dimensional porous collection body material, such as copper foil net, copper wire net, foam copper foam nickel is adopted; a layer of silicon film or silicon-metal composite film is formed on the copper foil net, copper wire net, foam copper foam nickel by a magnetron sputtering method, and then the three-dimensional porous film silicon-based negative electrode material is formed by a heat treatment manner. According to the invention, based on the three-dimensional porous structure, the forming of silicon-metal alloy as well as excellent binding force between the film negative electrode material and the three-dimensional porous collection body, the cell prepared from the porous film silicon-based negative electrode material has higher discharge specific capacity and first charge-discharge efficiency and excellent cycle performance. The method is simple in operation, and has wide application prospects in the field of lithium ion cell negative electrodes.

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, and belongs to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries are known as the ideal energy, green energy and dominant power source in the 21st century, showing broad application prospects and potentially huge economic benefits. With the advancement of the electronics industry, electric vehicles and aerospace technology, higher requirements have been 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" problem is how to design and develop new electrode materials. [0003] In the field of lithium-ion battery research, its research focus is on ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/80
CPCY02E60/12H01M4/80H01M4/38Y02E60/122H01M4/808H01M4/661H01M4/1395H01M4/386H01M4/134Y02E60/10
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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