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Nano combination electrode material Li3N/Si used for lithium ion battery and its preparation method

A lithium-ion battery and nano-composite technology, which is applied in battery electrodes, electrode manufacturing, metal material coating processes, etc. The effect of improving the utilization rate and simple preparation process

Inactive Publication Date: 2008-07-16
FUDAN UNIV
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  • Application Information

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Problems solved by technology

At present, the most commonly used lithium-ion battery anode material is graphite, but its specific capacity is only about 350mAh / g, which makes it difficult to greatly improve the energy density of the entire battery

Method used

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  • Nano combination electrode material Li3N/Si used for lithium ion battery and its preparation method

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Experimental program
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Embodiment

[0010] Li with a molar ratio of 1:1 3 N and Si powder are fully mixed; then the mixture powder is pressed into a target material for pulse laser deposition, and a composite nano-mixture electrode film material is prepared by a pulse laser deposition method. Preparation conditions: the substrate is a stainless steel sheet, the distance between the substrate and the target is 30 mm; the deposition process is carried out in high-purity nitrogen, and the pressure is kept at 10 Pa; the deposition temperature is room temperature; the laser wavelength is 355 nm, the pulse frequency is 10 Hz, and the pulse width is 10 ns. The energy density is 2J / cm 2 ; The deposition time was 1 hour.

[0011] It was shown by SEM that the particle size in the deposited film was about 50nm. Indicating that the deposited film is Li 3 N / Si nanocomposite material. It was determined by TEM electron diffraction that the deposited film was Li 3 N / Si nano-hybrid, where Li 3 N is a hexagonal structure, a...

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Abstract

The invention belongs to the lithium ion membrane battery technical field, in particular relates to a nano composite electrode material Li3N / Si used for a lithium ion battery and a preparation method thereof. The material of the invention is a nano membrane which consists of Li3N and an IVA group element Si and can be prepared and obtained by means of pulse laser sedimentation, and grain diameter of Li3N / Si nano compounds is lower than 50 nanometers. Specific capacity of membrane electrode changes within the range of 400 to 650 mAh / g along with different proportions of Li3N and Si in the membrane, and superior electrochemistry performance is shown during the process of repeated charging and discharging. The specific capacity of the membrane electrode material of the invention is high; cyclicity is good; preparation method is simple. The invention is suitable for a lithium ion membrane battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion thin film batteries, and in particular relates to a nanometer-sized composite electrode active material and a preparation method thereof which can be used in lithium-ion batteries. Background technique [0002] With the development of society, especially the application of electronic computers, cameras, mobile phones and electric vehicles, higher and higher requirements are put forward for the power, capacity, charging and discharging speed, life, manufacturing cost and environmental friendliness of batteries. Requirements, traditional lead-acid batteries, nickel-cadmium batteries, etc. obviously can not meet well. Lithium-ion battery as a new type of high-level power supply, its development is showing an irresistible momentum, the international research on lithium-ion batteries is very important. In order to develop high-capacity lithium-ion batteries, the selection of anode materials is par...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04C23C16/48H01M4/38H01M4/58
CPCY02E60/10
Inventor 周永宁傅正文吴晓京
Owner FUDAN UNIV
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