Silicon-based composite material as well as preparation method and application thereof

A silicon-based composite material and composite material technology, which is applied in silicon compounds, chemical instruments and methods, silicon oxide, etc., can solve the problems of ineffective buffer volume expansion, poor battery cycle performance, and poor coating surface compactness.

Active Publication Date: 2021-09-28
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composite material with multi-level structure is coated with carbon fluoride, which effectively improves the battery capacity and the first Coulombic efficiency, and has excellent cycle performance. However, the physical method of ball milling is used to coat carbon fluoride on silicon nanoparticles in the preparation of the material. The surface and the coated surface have poor density. During the ball milling process, l

Method used

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  • Silicon-based composite material as well as preparation method and application thereof
  • Silicon-based composite material as well as preparation method and application thereof
  • Silicon-based composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Put the silicon element and silicon dioxide into the reactor at a mass ratio of 1:2, keep the temperature at 800 °C for 20 h at a vacuum of 0.1 Pa, and obtain silicon oxide after condensation and deposition.

[0036] (2) Break the above-mentioned silicon oxide into particles with a particle size of 1-10 μm, and then add the particles into the reactor, place them in an inert atmosphere, and heat at 10 °C·min -1 After heating to 950 ℃, hydrogen and methane gas (volume flow ratio 1:3) are introduced to carry out carbon coating on the surface, and the coating is kept for 2 hours. After cooling to room temperature, silicon oxide coated with vertical graphene is obtained. Complex.

[0037] (3) Place the above-mentioned carbon-coated silicon-oxygen compound downstream of a dual-temperature zone heating furnace, and place polyvinylidene fluoride upstream, wherein the mass ratio of silicon-oxygen compound to polyvinylidene fluoride is 1:10; in an inert Atmosphere, upstream ...

Embodiment 2

[0045] The silicon-based composite material of the present invention was prepared according to the same method as in Example 1, except that the hydrogen gas in the step (2) was removed by treatment. Other steps are the same as the silicon-based composite negative electrode material obtained in Example 1.

Embodiment 3

[0047] The silicon-based composite material of the present invention was prepared in the same manner as in Example 1, except that the methane gas in the step (2) was replaced with acetylene. Other steps are the same as the silicon-based composite material obtained in Example 1.

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Abstract

The invention provides a silicon-based composite material as well as a preparation method and application thereof. The composite material takes silicon and/or silicon oxide as an inner core, the outer surface of the inner core is coated with a carbon and carbon fluoride composite layer, the composite layer has a continuous and compact structure, wherein the carbon content of the coating layer is gradually reduced from inside to outside, the carbon fluoride content is gradually increased from inside to outside; therefore, the carbon fluoride coating layer formed by the structure has a better effect, and in the cycle process of the battery, fluorine on the surface reacts with lithium in a battery system to generate lithium fluoride, and a formed fluorinated interface can better maintain the structural stability, reduce side reactions and reduce the thickness of SEI, so the cycle performance of the composite material is effectively improved.

Description

technical field [0001] The invention relates to a silicon-based composite material and a preparation method thereof, in particular to the application of the silicon-based composite material as a negative electrode material of a high specific energy lithium ion battery. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for their chemical power sources have increased sharply. Lithium-ion batteries are widely used due to their advantages such as large specific energy, high operating voltage, and low self-discharge rate. In the field of mobile electronic terminal equipment. And with the increasing demand for high-energy power sources, lithium-ion batteries are developing towards higher energy densities. At present, most commercial lithium-ion batteries use lithium iron phosphate / graphite system. Due to the low theoretical capacity of the electrode it...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B33/021C01B33/113C01B32/16C01B32/184C01B32/186C01B32/205C01B32/15C01B32/10
CPCH01M4/366H01M4/386H01M4/483H01M4/628H01M10/0525C01B33/021C01B33/113C01B32/16C01B32/184C01B32/186C01B32/205C01B32/15C01B32/10C01P2004/80C01P2002/72C01P2002/86C01P2004/03C01P2004/04C01P2006/10H01M2004/021H01M2004/027Y02E60/10
Inventor 李金熠黄林波李阁程晓彦岳风树
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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