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Nitrogen silicon carbide as cathode material

A negative electrode material, silicon nitride technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve problems such as low theoretical capacity, low potential, and the inability of materials to form large-scale manufacturing.

Inactive Publication Date: 2013-01-23
张少波 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These materials cannot be scaled to manufacture
Currently, the carbon and graphite materials used have low theoretical capacity (372mAh / g) and low potential (Li vs. Li + <0.1V), it is necessary to improve the performance of the anode material

Method used

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  • Nitrogen silicon carbide as cathode material
  • Nitrogen silicon carbide as cathode material
  • Nitrogen silicon carbide as cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Both nano-silicon oxide and nano-carbon whiskers are self-made. The article of Frank T. Ferguson and Joseph A. Nuth published in J. Chem. Eng. Data, 2008, 53(12), pp 2824-2832 and the documents therein describe the preparation method of silicon oxide. The preparation method of nano-silicon oxide is roughly as follows: put a silicon oxide boat and silicon oxide powder in the quartz tube, evacuate, heat to 1250°C, pass in hydrogen gas, and the silicon oxide and hydrogen undergo a reduction reaction to form silicon oxide gas. Take it to the outlet condensation place, condense to form silica powder, and its particle diameter distribution is about 40-80nm. The article published by Ishioka M and Okada T et al. in Carbon, 1992, 30(7): 975 describes the preparation method of vapor-phase grown carbon nanofibers. The method is roughly to put the metal nickel particle catalyst inside the quartz tube, pass through methane with hydrogen as the carrier gas at 1100°C, and decompose i...

Embodiment 2

[0023]Weigh 7.14g of nano-silicon oxide powder and 9.25g of carbon fiber (all of which are 99.9% or higher in purity), and weigh another 1mg of nickel chloride powder. After mixing, put it into a graphite bowl and seal it with a lid , put it into a VSF-75 vacuum high-temperature sintering furnace, heat the mixture in an inert gas + nitrogen mixed atmosphere, raise the temperature at a rate of 25°C / min until 1700°C, maintain the heating time for 1 hour, and then naturally cool to room temperature. Open the lid of the bowl, and the product is silicon nitride, with a weight of 5.17g. In this process, the flow of nitrogen gas is adjusted to control the content of nitrogen atoms entering the growth of silicon-carbon crystals. As a doping element, it enters the silicon-carbon crystals to replace silicon or carbon atoms in the lattice, or enters the gaps, and the resulting nano-silicon-carbon crystals The cell parameters become larger. produces Si having the compound form 55 C 42 ...

Embodiment 3

[0027] The samples of Examples 8-10 listed in Table 2 were followed by the same general procedure as Examples 1-7, with the following differences. Use commercially available nano-silicon oxide (Suzhou Kai'an Coating Material Co., Ltd.), commercially available carbon nanofibers (300-600nm, aspect ratio greater than 30, ICHEL INC, Japan) to prepare silicon nitride carbide by sintering, and the cut-off temperature is 1750 ° C. The reaction time was maintained for 2 hours.

[0028] Each of the samples of Examples 1-10 listed in Table 1 was fabricated into an electrode. Cycling characterization was performed in an electrochemical cell with a lithium metal counter electrode. Electrodes were prepared as follows. Using a magnetic stirrer in a 45 ml stainless steel container, 2.9 g of silicon carbide powder, 0.22 g of conductive carbon (Shenzhen Weifeng Technology Co., Ltd.) and 1.2 g of polyvinylidene fluoride (dissolved in N-methyl- 20 weight percent solution in 2-pyrrolidone) mix...

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Abstract

The invention discloses a novel cathode material used in lithium ion batteries. The nitrogen silicon carbide is shown as formula Si1-x-yCxNy, wherein x and y are percentage values of atoms, x is larger than 0 and less than 1, and the sum of x and y is larger than 0 and less than 1; N is used as a doping element; elements Si, C and N are configured into single nanocrystalline; and when the concentration of N is more than 5%, and two-phase microstructures of silicon carbide and silicon nitride are formed. The cathode material has good circulation properties.

Description

technical field [0001] The invention relates to an application of an electrode material in a lithium ion secondary battery, a preparation method and the lithium ion battery. Background technique [0002] Lithium Ion Battery (LIB for short) is a storage battery after the nickel-cadmium battery and the nickel-metal hydride battery. As a new type of chemical power source, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The dual requirements of battery lightweight and environmental protection required by information systems are widely used in small digital systems such as mobile communications, notebook computers, and cameras, and can also provide power for electric vehicles. [0003] Lithium-ion batteries are under development. In addition to continuously improving cathode materials, it is important to prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 张少波张洪涛张泽森
Owner 张少波
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