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Anode material for double-shell capsule-shaped silicon-based lithium-ion battery and preparation method of anode material

A negative electrode material, ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as taking into account electrochemical properties, reduce migration distance, and improve cycle stability. , Environmentally friendly effect

Inactive Publication Date: 2015-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this material, the carbon shell accounts for 30-50wt% of the total mass of the composite material, but it is only treated as the outer cladding shell layer. Few people take their electrochemical properties into consideration, and even fewer Considering the method of improving the electrochemical performance of this material from the perspective of carbon shell

Method used

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  • Anode material for double-shell capsule-shaped silicon-based lithium-ion battery and preparation method of anode material
  • Anode material for double-shell capsule-shaped silicon-based lithium-ion battery and preparation method of anode material
  • Anode material for double-shell capsule-shaped silicon-based lithium-ion battery and preparation method of anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of capsule-like structure silica-coated silicon material template by surfactant soft template method:

[0039]At room temperature, mix 0.088g sodium dodecylbenzenesulfonate and 0.086g dodecyl sulfobetaine in a molar ratio of 1:1, add 10ml deionized water, and stir magnetically for 2 hours; then, mix 10ml silicon The powder suspension (8mg / ml) was added dropwise into the above mixed surfactant solution, and the stirring was continued during this process; the above solution was heated to 40°C in a water bath environment, and stirred for 2 hours; the 3-aminopropyl tris Add 94 μl of ethoxysilane and 300 μl of tetraethyl orthosilicate to the above solution respectively, and stir for 0.5 hours; then heat the mixed solution to 90°C in an oil bath and keep it warm for 48 hours; after the reaction, collect the product by centrifugation , washed the product with ethanol and deionized water respectively, and dried; then the product was added to 30ml of concentrated hyd...

Embodiment 2

[0041] Preparation of negative electrode material:

[0042] Add 0.3 g of the capsule-shaped silica-coated silicon template obtained in Example 1 into 25 ml of pure water and stir, add 1 g of glucose, stir for 1 hour, pour the solution into a 50 ml reaction kettle, and keep it in an oven at 180°C for 5 hours. After the end, the product was washed several times with ethanol and deionized water, and dried. Spread the dried product on a corundum porcelain boat (other refractory containers can be used instead of the corundum porcelain boat), sinter at 700° C. for 8 hours in an argon atmosphere, and cool to obtain an intermediate product. Then the obtained product was added into 20% hydrofluoric acid solution and stirred for 3 hours to obtain a capsule-shaped double-layer carbon-coated silicon nanocomposite material.

[0043] figure 1 is the X-ray diffraction pattern of the obtained sample, from figure 1 It can be seen from the above that, in addition to a broad peak at 23°, ther...

Embodiment 3

[0049] Add 0.1g of the product obtained in Example 1 into 15ml of pure water and stir, add 1g of glucose, stir for 1 hour, pour the solution into a 20ml reaction kettle, and keep it in an oven at 200°C for 2 hours. After the reaction, the product is washed with ethanol and deionized Wash with water several times and dry. Spread the dried product in a corundum porcelain boat (other refractory containers can be used instead of the corundum porcelain boat), sinter at 600° C. for 10 hours in an argon atmosphere, and cool to obtain an intermediate product. Then the obtained product was added into 5% hydrofluoric acid solution and stirred for 6 hours to obtain a capsule-shaped double-layer carbon-coated silicon nanocomposite material.

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Abstract

The invention discloses an anode material for a double-shell capsule-shaped silicon-based lithium-ion battery and a preparation method of the anode material. In the material, a nano-silicon nuclear is coated by a double-layer carbon shell; a certain space exists between the silicon nuclear and an inner-layer carbon shell. According to the preparation method, the material disclosed by the invention can be obtained by taking a capsule-shaped structural silicon dioxide-coated silicon nano-composite material as a template, performing pyrolysis on an organic carbon source to coat the inner surface and the outer surface of the template silicon dioxide, performing high-temperature carbonization under an inert atmosphere, and finally, etching the silicon dioxide template. According to the material, the first lithium embedding capacity is 3,125 mAh / g; the specific capacity can still be kept at 1,161mAh / g after 30-time repeated charge-discharge cycles. The preparation method provided by the invention is simple in process and environmentally friendly; industrial production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a double-shell capsule-shaped silicon-based lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries will become the main power source for electric vehicles due to their performance advantages such as high specific energy and long-lasting stability. Chemical energy storage technologies represented by lithium-ion batteries are also being actively invested in research and development. The current commercial lithium-ion battery anode material is graphite carbon material, but its theoretical capacity is only 372mAh / g; + ) range, which is very close to the deposition potential of metal lithium, which is not conducive to the safety of the battery. In order to meet the needs of high-capacity lithium-ion batteries, it is very urgent and necessary to research and develop electrode materials for lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36
CPCB82Y30/00H01M4/1395H01M4/362H01M10/0525Y02E60/10
Inventor 高濂孙壮宋雪峰张鹏陶思颖
Owner SHANGHAI JIAO TONG UNIV
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