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Preparation method of SiOx-based lithium ion battery composite anode material

A negative electrode material, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance deterioration, loss of electrical contact, capacity attenuation, etc., to improve conductivity, suppress volume changes, and improve cycle performance. Effect

Inactive Publication Date: 2016-08-03
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the huge volume expansion (about 400%) of the Si material during the charging process, this will lead to the separation between the electrode materials and the electrode material and the current collector, and then lose the electrical contact, resulting in rapid capacity decay and rapid deterioration of cycle performance.

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  • Preparation method of SiOx-based lithium ion battery composite anode material
  • Preparation method of SiOx-based lithium ion battery composite anode material
  • Preparation method of SiOx-based lithium ion battery composite anode material

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] The present invention proposes a simple SiO x A method for preparing a composite negative electrode material for a lithium-ion battery, using high-energy ball milling to make SiO x The size is effectively reduced, and by mixing with the C precursor polyacrylonitrile (PAN), a slurry is made, coated on a copper current collector, and dried to form a circular electrode, and subjected to pyrolysis treatment to obtain SiO x C composite anode material.

[0023] The SiO proposed by the present invention x Preparation method of composite negative electrode material for lithium-ion battery based on SiO x As the initial material, SiO was effectively reduced by a simple high-energy ball milling method combined with heat tr...

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Abstract

The invention discloses a preparation method of a SiOx-based lithium ion battery composite anode material. The preparation method includes the following steps that a SiOx material is subjected to high-energy ball milling treatment, and the size of the SiOx material is reduced; the SiOx material obtained after ball milling treatment is evenly mixed with a C precursor polyacrylonitrile (PAN) according to a certain proportion, slurry is prepared, a copper current collector is coated with the slurry, and a round electrode is prepared after drying is conducted; the round electrode is subjected to pyrolysis treatment, and the SiOx@C composite anode material is obtained. The method is simple in preparation process and low in cost, and a battery has good cycling performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a SiO x A method for preparing a composite negative electrode material for a lithium-ion battery. Background technique [0002] The demand for secondary batteries with high specific energy, high specific power, long life and low cost has become increasingly urgent for portable electronic devices, electric vehicles and energy storage systems. Due to its many advantages, lithium-ion batteries have become the protagonists that have attracted much attention in the field of secondary energy. [0003] The performance of the battery mainly depends on the electrode material. Si-based materials are used as anode materials for lithium-ion batteries, and can form Li 22 Si 5 Alloy, with high mass specific capacity (up to 4200mAhg -1 ), is now widely used graphite (372mAhg -1 ) ten times as much as the material. And it has a lower lithium extraction potential (about 0.1-0...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/48H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/483H01M4/583H01M10/0525Y02E60/10
Inventor 张均营李传波郑军左玉华薛春来成步文
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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