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Sioc composite electrode material

A technology of composite materials and particles, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as insufficient electrochemical performance

Inactive Publication Date: 2017-12-01
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, currently proposed silicon oxycarbide materials show insufficient electrochemical performance for practical applications in desired high-energy Li-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] Preparation of SiOC composites according to the invention

[0139] A sample of 28.850 g of amorphous phenyl bridged polysilsesquioxane compound and 6.053 g of crystalline silicon was put together in a roller and ground at 150 rpm for 1 hour.

[0140] The resulting powder was then pyrolyzed at 1000 °C for 1 hour under an argon atmosphere.

[0141] After pyrolysis, the samples were recovered and milled at 400 rpm for 30 minutes.

[0142] The obtained powder was added to an aqueous solution (62.5 g / L) containing PVA dissolved at 60°C. The resulting mixture was spray dried at 100°C, and the powder was recovered.

[0143] The powder was heat-treated at 200°C for 16 hours in air, and then pyrolyzed at 1000°C for 1 hour under an argon atmosphere.

[0144] Analysis of the obtained powder

[0145] Elemental analysis

[0146] The silicon content of the powder obtained was measured by inductively coupled plasma (ICP) emission spectroscopy. After combustion in a high-freq...

Embodiment 2

[0158] Embodiment 2 (comparative embodiment)

[0159] A 10 g sample of the phenyl bridged polysilsesquioxane compound was pyrolyzed at 1000° C. for 1 hour under an argon atmosphere.

[0160] The recovered samples were then milled at 400 rpm for 5 minutes.

[0161] The obtained powder was added to an aqueous solution containing dissolved PVA (62.5 g / L) and dispersed crystalline silicon particles (27.4 g / L).

[0162] The mixture was spray dried at 100°C and the powder was recovered.

[0163] The powder was heat-treated at 200°C for 16 hours in air, and then pyrolyzed at 1000°C for 1 hour under an argon atmosphere.

Embodiment 3

[0165] Preparation of SiOC composites according to the invention

[0166] A sample of 28.850 g of amorphous phenyl bridged polysilsesquioxane compound and 6.053 g of crystalline silicon was put together in a roller and ground at 150 rpm for 1 hour.

[0167] The obtained powder was then pyrolyzed at 1000 °C for 1 hour under an argon atmosphere.

[0168] After pyrolysis, the samples were recovered and milled at 400 rpm for 30 min.

[0169] A 6.25 g dosage of solid PVA was added to the roll and the mixture was ground at 150 rpm for 1 hour. The powder is recycled.

[0170] The powder was heat-treated at 200°C for 16 hours in air, and then pyrolyzed at 1000°C for 1 hour under an argon atmosphere.

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Abstract

The invention discloses a SiOC composite electrode material. The present invention relates to a SiOC composite material in microparticulate form, characterized in that the microparticles are formed, in whole or in part, of an amorphous SiOC matrix with Si ranging from 20 wt% to 60 wt%, O from 20 wt% to 40 wt% and C from 10 wt% to 50 wt%, based on the total weight of the SiOC matrix, wherein amorphous or crystallized silicon particles are embedded within said SiOC matrix and wherein the microparticles are of core / coating structure with a core formed of said amorphous SiOC matrix and coated with at least one amorphous carbon layer; and to a method for producing such SiOC composite material. It also relates to an electrode active material, an electrode and a battery, especially a lithium-ion battery, including the aforementioned SiOC composite material.

Description

technical field [0001] The present invention is directed to novel silicon oxycarbide (SiOC) composite materials in particulate form useful as electrode active materials, particularly for lithium-ion battery anodes, and methods for preparing such SiOC particulate materials. These electrodes can be used to form batteries with high capacity and long-term stability upon cycling. Background technique [0002] Lithium-ion batteries are widely used as, for example, power sources for laptop computers, cellular phones, and camcorders. Rechargeable lithium-ion batteries have a simple principle. During charging, lithium ions are extracted from the cathode and inserted into the anode as lithium. On discharge, the reverse process occurs. The electrodes used in these batteries are very important and can have a significant impact on battery performance. [0003] By far the most common anode materials are carbonaceous compounds such as graphite. Unfortunately, the conventional graphite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48C01B33/02C01B32/907C01B33/021C01B32/05
CPCC01B33/00C01B33/021C01P2002/02C01P2004/32C01P2004/38C01P2004/80C01P2006/12H01M4/364H01M4/386H01M4/48C01B32/907H01M4/136H01M4/58Y02E60/10C01B32/05H01M4/362H01M10/0525
Inventor 塞德里克·哈恩奥雷利安·里维埃尔胜彦大野敬三岩谷义人高野哲朗木崎正一近藤启一郎金尾
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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