Modified composite material containing silicon-base material, preparation method thereof, and application thereof in lithium ion battery

A composite material, silicon-based material technology, applied in the field of lithium-ion batteries, can solve the problems of inability to prevent delayed particle pulverization, lack of ductility of carbon tubes, inability to absorb effectively, etc., to improve overall performance, improve cycle performance, improve The effect of electrical conductivity

Pending Publication Date: 2019-02-01
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN 104112847A discloses a silicon-based negative electrode material and its method. The silicon-based negative electrode material includes: carbon tubes and nano-silicon particles located inside the carbon tubes. Since the carbon tubes have voids inside, the silicon particles can be fixed on the In the limited space in the carbon tube, the volume expansion or contraction of the silicon particles is within the limited space, which not only avoids affecting the electron transport performance between the active material and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a modified composite material containing silicon-based materials, the composite material is: SiO 1.5 The inner core, and the modified layer coated on the surface of the inner core, the modified layer is composed of a high molecular polymer coating film and nano activated carbon embedded in the high molecular polymer coating film, and the high molecular polymer The composition of the coating film is: a combination of CMC, SBR and polyaniline in a mass ratio of 1:4:5;

[0058] The particle size D50 of the SiO core is 5 μm to 10 μm, the thickness of the modified layer is 10 nm to 25 nm, and the particle size of the nano activated carbon is 10 nm to 20 nm;

[0059] Based on the total mass of the modified composite material as 100wt%, the mass percentage of the modified layer is 3wt%;

[0060] Assuming that the total mass of the modified layer is 100wt%, the mass percentage of the nano activated carbon is 1wt%.

[0061] Preparation:

[0062] (1) D...

Embodiment 2

[0070] This embodiment provides a modified composite material containing a silicon-based material, the composite material is: a SiO core, and a modified layer coated on the surface of the core, and the modified layer is coated with a high molecular polymer The film and the graphene embedded in the polymer coating film consist of a composition of CMC, SBR, sodium alginate and PAA in a ratio of 1:4:1:1;

[0071] The particle size D50 of the SiO core is 10 μm to 15 μm, and the thickness of the modified layer is 30 nm to 50 nm;

[0072] Based on the total mass of the modified composite material as 100wt%, the mass percentage of the modified layer is 5wt%;

[0073] Based on the total mass of the modified layer as 100wt%, the mass percentage of graphene is 1.5wt%.

[0074] Preparation:

[0075] (1) Disperse CMC, SBR, sodium alginate and PAA in water, and achieve uniform dispersion by stirring to obtain polymer slurry;

[0076] Then add the graphene slurry, realize uniform dispers...

Embodiment 3

[0083] This embodiment provides a modified composite material containing a silicon-based material. The composite material is: a SiO core coated with a carbon layer, and a modified layer coated on the surface of the core, and the modified layer is composed of a high The molecular polymer coating film and carbon nanotubes embedded in the polymer coating film are composed of the composition of sodium alginate and polyacrylic acid in a mass ratio of 1:1 ;

[0084] The particle diameter D50 of the SiO core covered by the carbon layer is 1 μm to 6 μm, the thickness of the modified layer is 5 nm to 20 nm, the length of the carbon nanotube is 10 μm to 20 μm, and the aspect ratio is 10000 to 20000;

[0085] Based on the total mass of the modified composite material as 100wt%, the mass percentage of the modified layer is 8wt%;

[0086] Based on the total mass of the modified layer being 100 wt%, the mass percentage of the carbon nanotubes is 0.5 wt%.

[0087] Preparation:

[0088] (1...

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PUM

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Abstract

The invention discloses a modified composite material containing silicon-base material, a preparation method thereof, and an application thereof in a lithium ion battery. The composite material includes a silicon-base core and a modifying layer covering same. The modifying layer includes a polymer covering film and a nano-conductive material embedded therein. The modified composite material not only can isolate an electrolyte to inhibit side reactions of the electrolyte on the surface of the material, thus improving overall performance of the battery, but also can improve electric conductivityand improve structural stability due to the unique structure by embedding the nano-conductive material in the polymer. Tension is absorbed by means of deformation, so that problems of breaking and pulverization and stripping of the electrode during processing and use of the silicon-base negative material are solved. The problems of pulverization and stripping of the electrode due to large expansion during charge/discharge processes of the silicon-base material are solved, thus stabilizing the structure of the electrode and improving cycle performance of the cell.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a modified composite material containing silicon-based materials, a preparation method thereof and an application in lithium ion batteries. Background technique [0002] Due to its high energy density, high voltage and environmental friendliness, lithium-ion batteries are widely used in portable power devices (such as mobile phones, computers) and electric vehicles. However, due to the influence of battery materials, conductive additives, and binders, it is currently difficult to prepare lithium-ion batteries with high reversible capacity, high cycle stability, and high rate performance. [0003] Anode materials are very important components of lithium-ion batteries, which directly affect the energy density and electrochemical performance of lithium-ion batteries. Excellent negative electrode materials can improve the reversible capacity, cycle performance, and rate ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/131H01M4/366H01M4/483H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 江柯成姚毅李艾橘徐大伟
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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