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Carbon-silicon composite material, preparation method and application thereof

A technology of composite materials and silicon-based materials, applied in the direction of electrode manufacturing, structural parts, electrical components, etc., can solve the problems of current collector fracture, difficulty in realizing cycle characteristics, and inability to obtain cycle characteristics, etc., to achieve high electronic conductivity and excellent charging Effects of /discharge cycle characteristics, excellent charge/discharge characteristics

Inactive Publication Date: 2009-12-16
CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the internal resistance of the battery increases, making it difficult to achieve satisfactory cycle characteristics
[0004] Some people add elements such as Cr, B or P to the silicon material, but the electronic conduction network between the silicon oxide particles will be gradually disconnected
Also, when using a ball mill to mix silicon materials and carbon nanotubes together, the electronic conduction network between silicon material particles is gradually disconnected, and satisfactory cycle characteristics cannot be obtained.
There are also people who directly form thin films of Si, Sn or Ge or their oxides on the current collector, but the thin film will expand in the thickness direction of the electrode plate, which will bend the electrode assembly or break the current collector, thereby greatly reducing the capacity.

Method used

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

Examples

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preparation example Construction

[0042] The preparation method of the above-mentioned carbon-silicon composite material specifically includes the following steps:

[0043] 1) Preparation of catalyst solution

[0044] Acetate of at least one of Fe, Co, Ni, Cu, Mg, Mn, Ti, Sn, Si, Zr, Zn, Ge, Pb and In is formulated into a catalyst solution of 0.0001M to 0.1M, and the solvent is selected from One or more of distilled water, ethanol, methanol, isopropanol, ethylene glycol or glycerin.

[0045] The choice of acetate was based on extensive testing by the inventors, other salts did not result in composites containing both large and small fibers. The concentration of the catalyst solution is 0.0001M to 0.1M. The composite material produced with a high concentration has a high content of carbon nanofibers and the working hours are short. When the concentration is small, the working hours required to prepare fibers with the same content will be extended.

[0046] The choice of solvent is based on selecting the solve...

Embodiment 1

[0066] Embodiment 1 Preparation of carbon-silicon composite material of the present invention

[0067] Dissolve 5 g of nickel acetate tetrahydrate in 100 g of methanol. The solution thus obtained was mixed with 35 g of silicon oxide (SiO) pulverized to a particle size of 3 μm or less, and the mixture of the silicon oxide particles and the solution was stirred for 1 hour, and then water was removed by an evaporator to allow the silicon oxide particles to be supported on the surface thereof. Nickel acetate.

[0068] The silica particles loaded with nickel acetate were placed in a quartz reaction vessel, and the temperature was raised to 550 °C in the presence of helium. Then, the helium gas was replaced with a mixed gas consisting of 50% by volume of hydrogen and 50% by volume of methane gas, and the inside of the reaction vessel was maintained at 550° C. for 90 minutes to grow fine particles including fibers with a diameter of about 20 nm on the surface of the silicon oxide pa...

Embodiment 2

[0070] Embodiment 2 Preparation of carbon-silicon composite material of the present invention

[0071] Except that 3.5 g of nickel acetate tetrahydrate was dissolved in 100 g of methanol solution instead of 5 g of nickel acetate tetrahydrate, the same operation as in Example 1 was carried out, and this was set as electrode material B for a non-aqueous electrolyte secondary battery. The particle size of the nickel particles carried on the silicon oxide particles was substantially the same as that of the nickel particles in Example 1. The fiber diameter and fiber length of the grown carbon nanofibers were almost the same as in Example 1, and the weight ratio to the active material particles was 20%. Here, in SEM observation, in addition to fibers having a fiber diameter of about 80 nm, the existence of fine fibers having a fiber diameter of 30 nm or less was also confirmed.

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Abstract

The invention relates to a carbon-silicon composite material, a preparation method and application thereof, which belongs to the technical field of lithium-ion battery manufacture. The invention solves the technical problem that stress caused by the expansion and contraction of silicon oxide particles can be buffered while the electronic conductivity of silicon cathode materials is improved. The carbon-silicon composite material comprising silicon-based materials, and is obtained by growing carbon nanofibers on the surfaces of silicon-based material particles in the presence of at least one metal catalyst selected from Fe, Co, Ni, Cu, Mg, Mn, Ti, Sn, Si, Zr, Zn, Ge, Pb and In, wherein the carbon nanofibers grow in the form of vines and surround the surfaces of the silicon-based material particles. Cathodes prepared from the material have high electronic conductivity, so that the batteries with excellent initial charge / discharge characteristics can be obtained, and can be used to drive mobile communication devices, small electronic devices, electric vehicles, hybrid electric vehicles and other transportation vehicles.

Description

technical field [0001] The invention relates to a carbon-silicon composite material, a preparation method and application thereof, and belongs to the technical field of lithium-ion battery manufacturing. Background technique [0002] In the 21st century, with the development of semiconductors for the miniaturization of portable telecommunication equipment, new paradigms of information technology capable of multimedia interactive communication have been introduced, such as notebook computers, mobile phones, and DMB phones. In response to the demands of multifunctional electronic devices, high-capacity and high-voltage secondary batteries have been developed and related electrode materials have been developed. Since Sony Corporation developed and put its first graphite-based lithium-ion secondary battery on the market in the early 1990s, the energy density and capacity of secondary batteries have increased rapidly. However, the development of a secondary battery having higher...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04
CPCY02E60/12Y02E60/10
Inventor 于作龙潘中来任玉荣邓正华瞿美臻
Owner CHENGDU ZHONGKE LAIFANG POWER SCI & TECH CO LTD
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