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Production of si/c composite particles

A technology of composite particles and pre-compound particles, which is applied in the direction of electrochemical generators, structural parts, electrical components, etc., can solve the problems of expensive, large particle volume increase, inconvenience, etc.

Pending Publication Date: 2018-11-09
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, additional operations of this type are costly and inconvenient, and also result in waste material
Large diameter Si / C composite particles can be fatal if used in Li-ion batteries, as such particles can exceed the layer thickness of the anode material in the battery and thus can puncture electrodes or separators in the battery, causing a short circuit in the battery , thereby terminating the function of the battery
This problem is exacerbated by the extreme volume expansion experienced by the silicon present in the particles during the charging cycle, with the resultant large increase in the volume of the large particles

Method used

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  • Production of si/c composite particles
  • Production of si/c composite particles
  • Production of si/c composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Embodiment 1 (comparative):

[0107] Spray drying of PAN: Formation of aggregated PAN fibers:

[0108] 12.5 g of polyacrylonitrile (PAN) was dissolved in 500 ml of dimethylformamide (DMF) at room temperature. The resulting dispersion was dried using a Model B-290 laboratory spray dryer with a B-295 inert circuit ( GmbH) and B-296 dehumidifier ( GmbH) (nozzle tip 0.7mm; nozzle cap 1.4mm; nozzle temperature 130°C; N 2 Air flow ~40; aspirator 100%; pump 20%) for spraying and drying.

[0109] figure 1 A SEM image (2500X magnification) of the obtained powder is shown. The product is colorless and consists of fiber coils of nanoscale PAN fibers, and individual shaped PAN spheres.

Embodiment 2

[0110] Embodiment 2 (comparative):

[0111] Production of spray-dried and aggregated C particles of PAN:

[0112] 1.5 g of polyacrylonitrile (PAN) was dissolved in 100 ml of dimethylformamide (DMF) at room temperature. The resulting dispersion was dried using a Model B-290 laboratory spray dryer with a B-295 inert circuit ( GmbH) and B-296 dehumidifier ( GmbH) (nozzle tip 0.7mm; nozzle cap 1.4mm; nozzle temperature 130°C; N 2 Air flow ~30; aspirator 100%; pump 20%) for spraying and drying. A colorless powder was obtained.

[0113] 647 mg of this powder was placed in a fused silica calciner (QCS GmbH) and cascaded conditioning was used, including the use of argon / H 2 As an inert gas N-type probe element, carbonization was carried out in a three-zone tube furnace (TFZ 12 / 65 / 550 / E301; Carbolite GmbH): first, the heating rate was 10 °C / min, the temperature was 300 °C, and the holding time was 90 min. Ar / h 2 The flow rate is 200ml / min; then the heating rate is 10°C / min,...

Embodiment 3

[0115] Embodiment 3 (comparative):

[0116] Production of Aggregated Si / C Composite Particles:

[0117] 12.0 g of polyacrylonitrile (PAN) was dissolved in 800 ml of dimethylformamide (DMF) at room temperature. 8.6 g of silicon nanopowder suspension (20.3% in ethanol, corresponding to 1.75 g of silicon) were dispersed in this PAN solution by ultrasound (Hielscher UIS250V; amplitude 80%, period: 0.9; duration: 30 min). The resulting dispersion was dried using a Model B-290 laboratory spray dryer with a B-295 inert circuit ( GmbH) and B-296 dehumidifier ( GmbH) (nozzle tip 0.7mm; nozzle cap 1.4mm; nozzle temperature 130°C; N 2 Air flow ~30; aspirator 100%; pump 20%) for spraying and drying. 11.1 g of brown powder were obtained (yield 80%).

[0118] 10.6 g of the resulting Si / PAN pre-composite was placed in a sintered quartz sintered boat (QCS GmbH) and cascade conditioning was used, including the use of argon / H 2 N-type thermocouples used as an inert gas were carbonized...

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Abstract

The invention relates to methods for producing Si / C composite particles, characterised in that mixtures containing silicon particles, one or more oxygen-free polymers, one or more carbon additives based on a carbon modification and one or more liquid dispersing agents are dried by spray drying and the pre-composite particles thus obtained are thermally treated.

Description

technical field [0001] The present invention relates to a process for the production of pre-composite granules by spray-drying a composition comprising polymer and silicon particles, to the pre-composite granules obtainable thereby, to the production of Si / C composite granules by heat treatment of the pre-composite granules , relating to the Si / C composite particles thus obtainable and to their use in electrode materials for lithium-ion batteries, more particularly for the production of negative electrodes for lithium-ion batteries. Background technique [0002] Rechargeable lithium-ion batteries are currently commercially available electrochemical energy storage devices with the highest energy density (up to 250 Wh / kg). They are used first and foremost in the field of portable electronics, in tools, but also in means of transport, such as bicycles or automobiles. However, especially for applications in automobiles, further significant increases in the energy density of bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M4/587H01M10/052
CPCH01M4/134H01M4/364H01M4/386H01M4/587H01M10/052H01M4/133Y02E60/10H01M4/622H01M4/625H01M10/0525
Inventor 丹尼斯·特勒格尔叶连娜·潘泰利克-塞德尔
Owner WACKER CHEM GMBH