Modified composite material containing silicon-based material, preparation method thereof and use thereof in lithium ion battery

A technology of composite materials and silicon-based materials, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of carbon tubes lack of ductility, unable to prevent and delay particle pulverization, and unable to effectively absorb, etc., to achieve improved Overall performance, improved cycle performance, and reduced electrode crushing effects

Inactive Publication Date: 2018-12-28
JIANGSU TAFEL NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 on

Method used

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  • Modified composite material containing silicon-based material, preparation method thereof and use thereof in lithium ion battery

Examples

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Example Embodiment

[0050] Example 1

[0051] This embodiment provides a modified composite material containing a silicon-based material, the composite material is: a SiO core and a polymer coating layer covering the surface of the core, the composition of the polymer coating layer is Polyvinylidene fluoride;

[0052] The particle size D50 of the SiO core is 5 μm, and the thickness of the polyvinylidene fluoride coating layer is 10 nm;

[0053] Based on the total mass of the modified composite material being 100 wt%, the polyvinylidene fluoride coating layer has a mass percentage of 3 wt%.

[0054] Preparation:

[0055] (1) Disperse the polymer in the NMP liquid solvent, uniformly disperse it by stirring, vibration, ultrasound and other methods to obtain a slurry;

[0056] (2) Add the SiO negative electrode material to the slurry, and achieve uniform solid-liquid mixing by stirring, vibration, ultrasonic and other methods;

[0057] (3) Use filtration, evaporation and other methods to remove the solvent, so ...

Example Embodiment

[0062] Example 2

[0063] This embodiment provides a modified composite material containing a silicon-based material, and the composite material is: SiO 1.5 A core, and a polymer coating layer covering the surface of the core, the composition of the polymer coating layer is: a combination of CMC, SBR and polyaniline in a mass ratio of 1:4:5;

[0064] The particle size D50 of the SiO core is 5 μm-10 μm, and the thickness of the polymer coating layer is 10 nm-25 nm;

[0065] Based on the total mass of the modified composite material being 100 wt%, the mass percentage of the polymer coating layer is 3 wt%.

[0066] Preparation:

[0067] (1) Disperse CMC, SBR and polyaniline in water, uniformly disperse them by stirring, vibration, ultrasound and other methods to obtain slurry;

[0068] (2) SiO 1.5 The negative electrode material is added to the slurry, and the solid and liquid are uniformly mixed by stirring, vibration, ultrasound and other methods;

[0069] (3) Use filtration, evaporation a...

Example Embodiment

[0073] Example 3

[0074] This embodiment provides a modified composite material containing a silicon-based material, the composite material is: a SiO core and a polymer coating layer covering the surface of the core, the composition of the polymer coating layer is : CMC, SBR, sodium alginate and PAA in a combination of 1:4:1:1;

[0075] The particle size D50 of the SiO core is 10 μm to 15 μm, and the thickness of the polymer coating layer is 30 nm to 50 nm;

[0076] Based on the total mass of the modified composite material being 100 wt%, the mass percentage of the polymer coating layer is 5 wt%.

[0077] Preparation:

[0078] (1) Disperse CMC, SBR, sodium alginate and PAA in water, uniformly disperse them by stirring, vibration, ultrasound and other methods to obtain slurry;

[0079] (2) Add the SiO negative electrode material to the slurry, and achieve uniform solid-liquid mixing by stirring, vibration, ultrasonic and other methods;

[0080] (3) Use filtration, evaporation and other m...

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Abstract

The invention discloses a modified composite material containing a silicon base material, which comprises a silicon base core and a polymer cladding layer covering the surface of the core, and a preparation method and use thereof in a lithium ion battery. The method comprises the steps of : 1) adding a polymer into a liquid solvent and dispersing to obtain a slurry; 2) adding a silicon-based material or a mixture of that silicon-based material and the carbon material into the slurry and mixing the solid and liquid; 3) removing the solvent to obtain a modified composite material containing a silicon-based material. As the polymer coat layer is introduced on the surface of the silicon base core, so that the electrolyte can be isolated and the side reaction of the electrolyte on the surface of the silicon base core can be prevented; the method can also improve the crushing, electrode pulverization and peeling of the silicon-based negative electrode material in the process of processing and using, and reduce the electrode crushing and peeling caused by the huge volume expansion of the silicon-based material in the process of charging and discharging, so as to achieve the purpose of stabilizing the electrode structure and improving the cell cycle performance.

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): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/622H01M4/623H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 姚毅江柯成刘娇张素启
Owner JIANGSU TAFEL NEW ENERGY TECH CO LTD
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