SiOx-C composite fiber felt anode material as well as preparation method and application thereof

A technology of composite fiber felt and composite fiber, which is applied in the field of SiOx-C composite fiber felt negative electrode material and its preparation, can solve the problem of SEI on the surface of electrode material to be further deepened, lower charge and discharge efficiency of electrode material, increase of irreversible capacity for the first charge and discharge, etc. problem, achieve the effect of reducing the first capacity loss, improving cycle stability, and avoiding aggregation and shedding

Inactive Publication Date: 2020-10-13
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formation of SEI consumes part of lithium ions, which increases the irreversible capacity for the first charge and discharge and reduces the charge and discharge efficiency of electrode materials.
Therefore, the study of SEI on the surface of electrode materials still needs to be further deepened.

Method used

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  • SiOx-C composite fiber felt anode material as well as preparation method and application thereof
  • SiOx-C composite fiber felt anode material as well as preparation method and application thereof
  • SiOx-C composite fiber felt anode material as well as preparation method and application thereof

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preparation example Construction

[0066] According to the method for preparing the above-mentioned SiOx-C composite fiber felt negative electrode material according to the embodiment of the present invention, the method uses electrospinning to fix the silicon oxide particles inside or on the surface of the carbon-based conductive matrix, and the silicon oxide particles can be fixed In the negative electrode conductive system, it is conducive to the stability of battery cycle performance. The silica nanoparticles are uniformly dispersed inside or on the surface of the carbon fiber matrix, which avoids the agglomeration of such nanomaterials during repeated charging and discharging. The carbon fibers link all the silica particles together to form a conductive network. Compared with coating the active material on the current collector Cu foil used in the traditional negative electrode, this method avoids the problem of silicon oxide particles being pulverized and detached from the conductive network. In order to ...

Embodiment 1

[0072] Under magnetic stirring, slowly add 30g of polyacrylonitrile (PAN) powder into 270mL of N,N-dimethylformamide (DMF), fully dissolve until the solution becomes clear and transparent, then add 10g of SiOx particles, as a spinning silk solution. An electrospinning machine is used to spin SiOx-polymer composite fiber filaments, and these composite fiber filaments are overlapped to form a SiOx-polymer composite fiber mat. Pre-oxidize the above SiOx-polymer composite fiber mat, keep it at 250 degrees Celsius for 3 hours, and the heating rate is 3 degrees Celsius / min; carbonize the pre-oxidized product, keep it at 800 degrees Celsius for 5 hours, and obtain SiOx-C fiber mat.

[0073] The SiOx content in the obtained SiOx-C fiber mat is 38.4%, and the thickness of the SiOx-C fiber mat is 200 μm.

[0074] Using natural gas as the carbon source, the carbon coating layer was coated on the surface of SiOx-C composite fiber by CVD method.

[0075] In the synthetic electrolytic cel...

Embodiment 2

[0078] Under magnetic stirring, 30 g of polyvinyl acetate (PVAc) particles were slowly added to 270 mL of acetone, fully dissolved until the solution became clear and transparent, and then 5 g of SiOx particles were added as a spinning solution. An electrospinning machine is used to spin SiOx-PVAc composite fiber filaments, and these composite fiber filaments are overlapped to form a SiOx-PVAc composite fiber mat. Pre-oxidize the above SiOx-PVAc composite fiber mat, keep it at 270 degrees Celsius for 4 hours, and the heating rate is 5 degrees Celsius / minute; carbonize the pre-oxidized product, and keep it at 900 degrees Celsius for 4 hours to obtain a SiOx-C fiber mat.

[0079] The SiOx content in the obtained SiOx-C fiber mat is 24.4%, and the thickness of the SiOx-C fiber mat is 350 μm.

[0080] Using natural gas as the carbon source, the carbon coating layer was coated on the surface of SiOx-C composite fiber by CVD method.

[0081] In the synthetic electrolytic cell of th...

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Abstract

The invention discloses a SiOx-C composite fiber felt anode material and a preparation method and application thereof.The The SiOx-C composite fiber felt anode material comprises SiOx-C composite fiber yarn, a carbon coating layer and an SEI film layer, and the SiOx-C composite fiber yarn comprises carbon fibers and silicon monoxide nanoparticles loaded inside or on the surfaces of the carbon fibers; the carbon coating layer coats at least part of the surface of the SiOx-C composite fiber yarn; and the SEI film layer is coated on at least part of the surface of the carbon coating layer. The SiOx-C composite fiber felt disclosed by the invention can be directly cut into a required size after being processed into a certain thickness, so that the use of a negative current collector and a binder is avoided, the energy density of the battery is increased, and the material cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a SiOx-C composite fiber mat negative electrode material and a preparation method and application thereof. Background technique [0002] As the current consumer market has higher and higher requirements for the cruising range and energy consumption per unit mileage of electric vehicles, the research and development of power batteries is increasingly developing in the direction of high energy density. Among them, the transformation of negative electrode materials from graphite to silicon-based materials can significantly increase the energy density of power batteries. However, due to the volume effect of silicon materials in the charge-discharge cycle process, the current industry is more inclined to use silicon-oxygen materials as negative electrode materials for power batteries. The active material of the silicon-oxygen negative electrode material is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/66H01M4/139H01M10/0525B82Y30/00B82Y40/00D01F9/08
CPCB82Y30/00B82Y40/00D01F9/08H01M4/139H01M4/483H01M4/625H01M4/663H01M10/0525H01M2220/20Y02E60/10
Inventor 邱昭政李文龙赵育松梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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