A kind of silicon-based composite material, its preparation method and application

A silicon-based composite material and a technology for silicon-based materials, applied in the field of lithium-ion batteries, can solve the problems of restricting the commercial application of lithium-ion batteries, deteriorating cycle performance of lithium-ion batteries, and changing the volume of active material particles, etc. Industrial production, simple and easy implementation cost, the effect of improving energy density

Active Publication Date: 2018-05-22
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of removing / inserting lithium in silicon-based materials, the volume of the active material particles changes greatly, which is easy to break and fall off, resulting in the pulverization of the electrode film, which deteriorates the cycle performance of the lithium-ion battery and limits the lithium-ion battery. commercial application

Method used

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  • A kind of silicon-based composite material, its preparation method and application
  • A kind of silicon-based composite material, its preparation method and application
  • A kind of silicon-based composite material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation of silicon-based composite material A1:

[0063] 100 parts by mass of SiOx powder were dispersed in 1000 parts by mass of 3-aminopropyltriethoxysilane in an anhydrous tetrahydrofuran solution with a concentration of 1 mol / L. Add 0.1 parts by mass of dibutyltin acetate and 1 part by mass of water to the resulting suspension under constant stirring, and react at 20°C for 5 hours, then filter and collect the solids at 500°C for 3 hours to obtain The silicon-based composite material is denoted as A1.

[0064] Production of negative electrode sheet N1:

[0065] Dissolve 5 parts by mass of polyacrylic acid (abbreviated as PAA) in 110 parts by mass of water, add the obtained A1 and 5 parts by mass of conductive agent acetylene black, and mix uniformly to obtain negative electrode slurry. The negative electrode slurry is evenly coated on the negative electrode current collector copper foil with a thickness of 12 μm, and the solid coating amount is 0.0089 g / cm ...

Embodiment 2

[0073] Preparation of silicon-based composite material A2:

[0074] 100 parts by mass of SiOx powder were dispersed in 500 parts by mass of p-anilinotriisopropoxysilane in anhydrous dichloromethane solution with a concentration of 1.2 mol / L. The resulting suspension was heated to 40°C under constant stirring, 1 mass part of pyridine and 5 mass parts of water were added, and after reacting at 40°C for 7 hours, the solid collected by spray drying was treated at 300°C After 5 hours, the silicon-based composite material was obtained, denoted as A2.

[0075] Production of negative electrode sheet N2:

[0076] Dissolve 5 parts by mass of polyacrylic acid (abbreviated as PAA) in 110 parts by mass of water, add the obtained A2 and 5 parts by mass of conductive agent acetylene black, and mix uniformly to obtain negative electrode slurry. The negative electrode slurry is evenly coated on the negative electrode current collector copper foil with a thickness of 12 μm, and the solid ...

Embodiment 3

[0080] Preparation of silicon-based composite material A3:

[0081] 100 parts by mass of SiOx powder were dispersed in 1000 parts by mass of a toluene solution having a p-anilinotriisopropoxysilane concentration of 2 mol / L, and 10 parts by mass of water was added. The resulting suspension was heated to 90°C under constant stirring, and after reacting at 90°C for 10 hours, the solid collected by spray drying was treated at 100°C for 15 hours to obtain the silicon-based composite material, recorded as for A3.

[0082] Production of negative electrode sheet N3:

[0083] Dissolve 5 parts by mass of polymethyl methacrylate (abbreviated as PMAA) in 110 parts by mass of water, add the obtained A3 and 5 parts by mass of conductive agent acetylene black, and mix uniformly to obtain negative electrode slurry. The negative electrode slurry is evenly coated on the negative electrode current collector copper foil with a thickness of 12 μm, and the solid coating amount is 0.0089 g / cm ...

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Abstract

The application discloses a silicon-based composite material which comprises a silicon-based material, wherein the surface of the silicon-based material is modified by an organosilicon compound containing amino and / or carboxyl. The silicon-based composite material is applied to a lithium ion secondary battery, during a battery cycle process, the pulverization of an electrode membrane can be effectively relieved, and battery stability can be improved. When the silicon-based composite material is used with a carboxylic acid binding agent, a polycarboxylate binding agent or a polyimide binding agent in a matching way, hydrogen bonds can be formed by the silicon-based composite material and a polymer in the bonding agent, the adhesion force is enhanced, the incapability of the silicon-based material in contact with the binding agent and a conductive agent due to volume expansion / contraction during the battery cycle process is prevented, and therefore, energy density and cycle performance of the lithium ion secondary battery are effectively improved.

Description

technical field [0001] The application relates to a silicon-based composite material and a preparation method thereof, as well as a composite sheet and a lithium-ion battery using the silicon-based composite material, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, the commercial lithium-ion battery anode active material is mainly graphite. However, due to the limited mass-specific capacity of graphite and little room for improvement in volume-specific capacity, lithium-ion batteries using graphite as the anode active material cannot meet the needs of future high-capacity and small-volume electronic devices. [0003] Through research, it has been found that silicon is the most promising anode material for lithium-ion batteries. The theoretical gram capacity of silicon-based materials is as high as 4200mAh / g, and the theoretical volume specific capacity is as high as 7200mAh / cm 3 . However, during the process of removing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/137H01M10/0525
CPCH01M4/137H01M4/60H01M10/0525Y02E60/10
Inventor 洪响钟开富李翠丽陈振黄起森王松茹
Owner NINGDE AMPEREX TECH
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