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Preparation method of copper-coated porous silicon composite material and composite electrode for lithium ion battery

A composite material, porous silicon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of volume expansion of electrode materials, and achieve the effect of improving electrical conductivity, high reversible capacity and capacity retention rate, and high reversible capacity

Pending Publication Date: 2020-05-15
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing a copper-coated porous silicon composite material and a composite electrode for lithium-ion batteries, so as to solve the problem of volume expansion of electrode materials in the prior art during charging and discharging

Method used

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  • Preparation method of copper-coated porous silicon composite material and composite electrode for lithium ion battery
  • Preparation method of copper-coated porous silicon composite material and composite electrode for lithium ion battery
  • Preparation method of copper-coated porous silicon composite material and composite electrode for lithium ion battery

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preparation example Construction

[0025] As introduced in the background art, solving the volume expansion of silicon materials during charging and discharging is an urgent problem in this field. The inventors of the present invention have conducted research on the above-mentioned problems and proposed a method for preparing a copper-coated porous silicon composite material, which includes the following steps: S1, preparing a precursor comprising silicon dioxide and copper oxide; S2, using magnesia thermal reduction The precursor is treated to reduce silica and copper oxide to form a porous silicon and copper cladding layer.

[0026] Using the above-mentioned preparation method of the present invention, the generation of SEI film can be effectively suppressed by coating copper on the porous silicon surface, and the conductivity of the above-mentioned composite material can be improved at the same time, so that it can be used as an electrode material to obtain higher first-time reversible capacity and Coulomb e...

Embodiment 1

[0041] The preparation method of the copper-coated porous silicon composite material provided in this embodiment comprises the following steps:

[0042] In a 100mL beaker, a certain amount of SiO 2 Mix with 50ml deionized water and ultrasonically disperse for 30min. According to the initial molar ratio of Si / Cu of 10:1, add a certain amount of 0.5mol / L CuSO drop by drop 4 ·5H 2 O solution, stir for 1 hour to mix the solution evenly, then add 8mol / L ammonia water drop by drop, a light blue basic copper sulfate precipitate is formed, continue to add ammonia water until the precipitate is completely dissolved, and a dark blue copper ammonia complex is formed. solution of ions. Weigh a certain amount of NaOH according to the Cu / Na molar ratio of 1:3, dissolve NaOH in 30mL of absolute ethanol, add it dropwise to the reaction system, stir at room temperature for 2h, then place it in a water bath at 30°C for 24h . After the reaction, it was filtered with suction, washed repeated...

Embodiment 2

[0045] The difference between the preparation method provided by this embodiment and Example 1 is:

[0046] Add CuSO dropwise at an initial Si / Cu molar ratio of 20:1 4 ·5H 2 O solution.

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Abstract

The invention provides a preparation method of a copper-coated porous silicon composite material and a composite electrode for a lithium ion battery. The preparation method comprises the following steps of S1, preparing a precursor containing silicon dioxide and copper oxide; and S2, treating the precursor by adopting a magnesiothermic reduction method so as to reduce silicon dioxide and copper oxide to form a porous silicon and copper coating layer. By coating copper on the surface of porous silicon, the generation of an SEI film can be effectively inhibited, and meanwhile, the conductivity of the above composite material can be improved, so that the higher first reversible capacity and the coulombic efficiency can be obtained by taking the composite material as an electrode material. Moreover, the porous structure of silicon buffers the volume expansion, and the coating of a proper amount of copper can effectively improve the conductivity of the material and form a proper amount of silicon-copper alloy supported porous skeleton structure, so that the composite material can keep higher reversible capacity and capacity retention ratio after being used as the electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a copper-coated porous silicon composite material and a composite electrode for lithium-ion batteries. Background technique [0002] With the rapid development and widespread application of electric vehicles and portable electronic products, there is an increasing demand for high-capacity, long-life batteries. However, graphite, as the main anode material for commercial lithium-ion batteries at present, has a low theoretical capacity. Therefore, there is an urgent need to develop new electrode materials with high capacity and high stability. [0003] Silicon material has a high theoretical capacity (4200mA·h / g) and a suitable lithium intercalation potential, and is rich in sources. It is expected to replace graphite as the anode material for the next generation of power batteries. However, the disadvantages of electrode materials formed by s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/36H01M4/366H01M4/38H01M10/0525Y02E60/10
Inventor 李倩倩成信刚杨鹏帅
Owner NORTHERN ALTAIR NANOTECH CO LTD
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