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Composite core-shell particles

A composite particle, core-shell technology, applied in active material electrodes, structural parts, electrical components, etc., can solve the problem of lack of impermeability of Si/C composite materials

Active Publication Date: 2017-12-01
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fact that the copper-coated Si / C composite of WO215051309 is active in Li-ion batteries demonstrates the lack of impermeability of the Si / C composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0125] Porous core-shell composite particles from Example 1 were provided with a coating of amorphous carbon (based on soft carbon; 10% by weight):

[0126] 3.89 g of the porous composite particles obtained in Example 1 after the carbonization step were combined with 630 mg of pitch (high melting point; softening point 235° C. ) were dispersed together in 60ml of p-xylene. The suspension was stirred at reflux for 90 minutes and cooled to room temperature over a period of 14 hours. The solvent was removed under reduced pressure, and the pitch-coated composite particles were transferred to a fused silica calciner (QCS GmbH) with a gas containing sample element type N and argon / H 2 Cascade control carbonization as an inert gas: first, the heating rate is 10°C / min, and the temperature is 250°C; then, the heating rate is 5°C / min, and the temperature is 550°C; Time 2 hours, Ar / H 2 The flow rate is 200ml / min for further carbonization directly. After cooling, 3.99 g of a black pow...

Embodiment 4

[0144] Embodiment 4 (Ex.4):

[0145] The conductive carbon black-containing porous core-shell composite particles from Example 3 were provided with an additional coating consisting of amorphous carbon (soft carbon; 10% by weight):

[0146] 4.54 g of the porous composite particles obtained in Example 3 after the carbonization step and 720 mg of pitch (high melting point; softening point 235° C. ) were dispersed together in 60ml of p-xylene. The suspension was stirred at reflux for 90 minutes and cooled to room temperature over a period of 14 hours. The solvent was removed under reduced pressure, and the pitch-coated composite particles were transferred to a fused silica calciner (QCS GmbH) with a gas containing sample element type N and argon / H 2 Cascade control carbonization as an inert gas: first, the heating rate is 10°C / min, the temperature is 250°C; then the heating rate is 5°C / min, the temperature is 550°C; 2 hours, Ar / H 2 The flow rate is 200ml / min for further carbon...

Embodiment 5

[0153] Electrode coatings were produced using composite materials from Example 4:

[0154] 0.24 g of conductive carbon black (Imerys, Super C65) was dissolved in 11.34 g of press- 1.4% by weight of sodium carboxymethylcellulose (Daicel, Grade 1380) in aqueous solution. After adding 1.50 g of the composite material from Example 4, 1.02 g of water and 0.60 g of ethanol, the mixture was then stirred for a further 30 minutes at a peripheral speed of 12 m / s. After degassing, the dispersion was applied to a copper foil (Schlenk Metallfolien, SE-Cu58) with a thickness of 0.030 mm by means of a film drying rack (Erichsen, type 360) with a gap height of 0.16 mm. Subsequently, the electrode coating produced in this way was dried for 60 minutes at 80° C. and an air pressure of 1 bar. The average weight per unit area of ​​the dry electrode coating is 1.55 mg / cm 2 .

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Abstract

The invention relates to composite core-shell particles wherein the core is a porous, carbon-based matrix which contains silicon particles enclosed in pores of the matrix; the pores containing the silicon particles have a diameter of not less than 60 nm as determined by scanning electron microscopy (SEM); the shell can be obtained by carbonizing one or more carbon precursors selected from among the group comprising tars, pitches, hard carbon, soft carbon and hydrocarbons having 1 to 20 carbon atoms, resulting in a non-porous shell.

Description

technical field [0001] The present invention relates to core-shell type composite particles, methods for producing them and their use in anode active materials for lithium-ion batteries. Background technique [0002] As a storage medium for electricity, lithium-ion batteries are currently the practical electrochemical energy storage with the highest energy density. Lithium-ion batteries are primarily used in the field of portable electronics for tools and electric vehicles such as bicycles or motor vehicles. Graphite carbon is currently widely used as material for the negative electrode ("anode") of corresponding batteries. However, a disadvantage is its relatively low electrochemical capacity of no more than 372 mAh theoretically per gram of graphite, which corresponds to only one tenth of the theoretically achievable electrochemical capacity when using lithium metal. The development of alternative anode materials has led to the addition of silicon. Silicon and lithium f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M4/583H01M10/0525H01M4/02
CPCH01M4/133H01M4/134H01M4/386H01M4/583H01M10/0525H01M2004/027H01M4/366Y02E60/10H01M4/587H01M4/62C01B33/02C01B32/05C01P2006/40C01P2004/80H01M4/1395H01M2004/021H01M4/1393H01M4/625
Inventor 丹尼斯·特勒格尔斯特凡·豪费
Owner WACKER CHEM GMBH
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