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Silicon-containing carbonaceous composite material

A composite material, silicon carbon technology, applied in the direction of carbide, silicon oxide, silicon dioxide, etc., can solve the problem of reversible capacity limitation, and achieve the effect of high reversible capacity, stable charge-discharge cycle characteristics, and high initial charge-discharge efficiency

Inactive Publication Date: 2013-12-04
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reversible capacity of lithium or lithium ion secondary batteries having electrodes comprising silicon-containing carbon materials such as the above-mentioned materials is limited due to the crystal structure of graphite and the like

Method used

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  • Silicon-containing carbonaceous composite material
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  • Silicon-containing carbonaceous composite material

Examples

Experimental program
Comparison scheme
Effect test

example

[0225] Hereinafter, the present invention will be described in detail based on examples and comparative examples. However, the present invention is not limited to these examples. In Examples and Comparative Examples, elemental analysis and evaluation of battery characteristics were performed as described below.

[0226] Elemental analysis

[0227] C, H and N analysis: Calculated from the sum of the amounts of each element detected by oxygen transfer combustion method, TCD detection method and high frequency combustion method, and infrared absorption detection method.

[0228] Device: NCH-21 or NCH-22F (manufactured by Sumika Chemical Analysis Service, Ltd.)

[0229] Device: CS-LS600 (manufactured by LECO Japan Corporation)

[0230] Device: Kamomatto12ADG (manufactured by Westhoff GmbH)

[0231] O Analysis: High Temperature Carbon Reaction / NDIR Detection

[0232] Device: EMGA-2800 (manufactured by Horiba, Ltd.)

[0233] Si analysis: ICP detection is performed after the ...

example 1

[0243] Preparation of silicon-containing cured products

[0244]A crosslinkable composition was prepared by mixing: 15.49 g of DVB570 (manufactured by Nippon Steel Chemical Co., Ltd.; main components: 57.0 mass (weight) % of divinylbenzene and 38.9 mass (weight) % of vinyl ethylbenzene; the proportion of divinylbenzene included in the main component: 60 mass (weight) %); terminal methylhydrogenpolysiloxane (viscosity: 20 mPa·s; silicon-bonded hydrogen atom content: 1.58 mass (weight) %; the amount used is such that there is about one mole per mole of vinyl groups in DVB570 silicon-bonded hydrogen atoms in the copolymer); and 1,3-divinyltetramethyldisiloxane-platinum complex platinum catalyst (amount used such that 10 ppm metallic platinum is present). Thereafter, a cured product was prepared by curing the obtained composition in nitrogen at a temperature of 120°C.

[0245] Preparation of silicon-carbon materials

[0246] 4 g of the above-mentioned solidified product was...

example 2

[0252] Preparation of silicon-containing cured products

[0253] A crosslinkable composition was prepared by mixing: 775 g of DVB570 (manufactured by Nippon Steel Chemical Co.; main components: 57.0% by mass (weight) of divinylbenzene and 38.9% by mass (weight) of vinylethylbenzene; Proportion of divinylbenzene included in the main component: about 60 mass (weight) %); 531 g of methylhydrogenpolysiloxane capped with trimethylsiloxy groups at both molecular terminals (viscosity: 20 mPa·s; silicon-bonded hydrogen atom content: 1.58% by mass (weight); the amount used is such that there is about one mole of silicon-bonded hydrogen atoms in the copolymer per mole of vinyl groups in DVB570 ); and 1,3-divinyltetramethyldisiloxane-platinum complex platinum catalyst (amount used such that 10 ppm metallic platinum is present). Thereafter, a cured product was prepared by curing the obtained composition in air at a temperature of 120°C.

[0254] Preparation of silicon-carbon materia...

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Abstract

A silicon-containing carbon-based composite material represented by the composition formula: SiOxCyHz (in the formula, x is 0.8-1.7, y is 1.4-7.5, and z is 0.3-1.3). It is preferable that the composite material be obtained by crosslinking (A) a crosslinkable group-containing organic compound and (B) a silicon-containing compound which is capable of forming bonds with the abovementioned crosslinkable group-containing organic compound, and heat treating the resultant cured product. The composite material has a high reversible capacitance and stable charge / discharge cycle characteristics, and also has a high initial charge / discharge efficiency and is ideal for electrodes in electricity storage devices, in particular lithium or lithium ion secondary batteries.

Description

technical field [0001] The invention relates to a silicon-containing carbon-based composite material, an electrode active material composed of the composite material, an electrode containing the active material, and an electrical storage device containing the electrode. Background technique [0002] Electric storage devices and especially lithium or lithium ion secondary batteries are being studied as a class of high energy density secondary batteries. It is generally well known that a negative electrode material for a lithium ion secondary battery having a high discharge charge capacity significantly exceeding the theoretical capacity of graphite can be obtained by baking any carbon source at a temperature close to 1,000° C. in an inert gas or vacuum. J.Electrochem.Soc. ("Journal of the Electrochemical Society"), 142, 2581 (1995) describes that any carbon source can be baked in an argon atmosphere and then used as a negative electrode material to obtain more than 800mAh / T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B31/36C01B33/12
CPCH01M4/587H01M4/386H01M4/362H01M10/0525C01B31/301C01B31/30H01M4/364H01M4/134H01M4/48Y02E60/122H01M4/133C01B32/907Y02E60/10
Inventor 福井弘张原志成赤坂昌保宋三番日野贤一江口胜哉潮嘉人
Owner DOW CORNING TORAY CO LTD