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Carbon-silicon composite material and preparation method thereof

A technology of silicon composite materials and raw materials, applied in electrode manufacturing, electrode heat treatment, non-aqueous electrolyte battery electrodes, etc., can solve the problems of charging capacity and capacity reduction, and achieve the effect of increasing charging capacity and capacity retention

Active Publication Date: 2018-04-17
OCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when lithium is released through a discharge process, the inorganic particles shrink, and when charge and discharge cycles are repeated, electrical insulation may occur due to empty spaces generated between the inorganic particles and the anode active material, Causes reduction in charge capacity and capacity retention, and therefore, the inorganic particles have serious problems when used in secondary batteries

Method used

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  • Carbon-silicon composite material and preparation method thereof
  • Carbon-silicon composite material and preparation method thereof
  • Carbon-silicon composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0101] Preparation of silicon-polymer carbide particles

[0102] A silicon slurry was prepared by dispersing 1 g of silicon particles having an average particle size of 50 nm in 9 g of N-methyl-2-pyrrolidone (NMP) used as a dispersion medium. 5g of acrylic acid, 1g of ethylene glycol dimethacrylate and 0.5g of 1,1'-azobis(cyclohexanecarbonitrile) were added to the prepared silicon slurry, and then stirred at 70°C for 12 hours. This prepares a silicon-polymer matrix slurry.

[0103] Here, D50 was 120 nm as a result obtained by measuring silicon distribution properties on the silicon-polymer matrix slurry by a dynamic light scattering method (measuring instrument: ELS-Z2, manufactured by Otsuka Electronics).

[0104] The prepared silicon-polymer matrix slurry was additionally heat-treated in an electric furnace at a temperature of 400° C. for 1 hour to prepare a silicon-polymer carbonized matrix, which was ground by using a planetary ball mill at 250 rpm Pulverized for 30 mi...

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Abstract

Disclosed herein is a method for preparing a carbon-silicon composite material, comprising: (a) preparing a silicon-polymer matrix slurry comprising a silicon slurry, a monomer, and a crosslinking agent; (b) heat-treating the silicon-polymer matrix slurry to prepare a silicon-polymer carbonized matrix; (c) pulverizing the silicon-polymer carbonized matrix to prepare silicon-polymer carbonized particles; and (d) mixing the silicon-polymer carbonized particles with a first carbon raw material , and then performing a carbonization process; the carbon-silicon composite material, an anode for a secondary battery prepared by applying the carbon-silicon composite material, and a secondary battery comprising the anode for a secondary battery.

Description

technical field [0001] The invention relates to a carbon-silicon composite material and a preparation method thereof. Background technique [0002] The use of anode materials for lithium secondary batteries capable of achieving high capacity is required for batteries for information technology (IT) equipment or batteries for automobiles. Therefore, silicon has attracted attention as an anode material of a lithium secondary battery having a high capacity. For example, pure silicon is known to have a high theoretical capacity of 4,200 mAh / g. [0003] However, when inorganic particles such as silicon used in the anode active material are directly used as the absorption and release material of lithium, the conductivity between the active materials deteriorates due to the volume change during the charge and discharge process, or the anode active material is separated from the anode collection. Electrical separation, such that inorganic particles have poor charge capacity and ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/052
CPCH01M4/362H01M4/386H01M4/587H01M10/052H01M4/13H01M4/0471H01M4/364Y02E60/10
Inventor 郑圣虎金尧燮郑恩惠河正贤
Owner OCI
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