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Silicon-based negative electrode material of lithium ion battery, preparation method of silicon-based negative electrode material, and battery

A silicon-based negative electrode material and lithium-ion battery technology, applied in battery electrodes, lithium batteries, nanotechnology for materials and surface science, etc., can solve problems such as carbon film cracking, material electrochemical contact failure, and cycle attenuation. Achieve the effects of stable structure performance, high rate performance and high energy density

Inactive Publication Date: 2019-07-19
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Abstract
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Problems solved by technology

[0004] However, it is reported in the literature (Effect of Volume Expansion on SEI Covering Carbon-CoatedNano-Si / SiO Composite Journal of The Electrochemical Society, 160(10)) that the carbon film formed by ordinary coating will crack obviously during the charge-discharge cycle, resulting in The electrochemical contact of the material fails, and the cycle decays sharply

Method used

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  • Silicon-based negative electrode material of lithium ion battery, preparation method of silicon-based negative electrode material, and battery
  • Silicon-based negative electrode material of lithium ion battery, preparation method of silicon-based negative electrode material, and battery
  • Silicon-based negative electrode material of lithium ion battery, preparation method of silicon-based negative electrode material, and battery

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preparation example Construction

[0048] The embodiment of the present invention provides the preparation method of above-mentioned silicon-based negative electrode material of lithium ion battery, such as figure 1 The flow chart shown, its steps include:

[0049] Step 110, selecting a silicon-based material according to the required mass ratio, and loading a catalyst on the surface of the silicon-based material by a solid-phase method or a liquid-phase method to obtain a mixed material;

[0050] Among them, the silicon-based material is a powder material containing electrochemically active silicon, including one or more mixtures of nano-silicon-carbon composite materials, silicon oxide materials, modified silicon oxide materials, and amorphous silicon alloys; Chemically active silicon accounts for 0.1wt%-90wt% of the silicon-based material;

[0051] Catalysts include iron, cobalt, nickel, copper, zinc, aluminum, magnesium, lithium, gold, silver, ruthenium, platinum and other metal elements, inorganic compoun...

Embodiment 1

[0062] This embodiment provides a specific method for preparing a silicon-based negative electrode material for a lithium-ion battery:

[0063] First, after fully mixing the commercial silicon oxide powder and the aqueous solution of ferric chloride, spray drying to obtain the silicon oxide powder loaded with the catalyst; wherein the weight fraction of the ferric chloride is 5 / 10,000;

[0064] Second, the silicon oxide powder of the above-mentioned loaded catalyst is placed in a high-temperature rotary furnace, and the Ar:H 2 =1:0.1 under the mixed gas, the temperature was raised to 900°C, acetylene gas equal to hydrogen gas was introduced, and the temperature was kept for 4 hours, then the acetylene gas was stopped, and the temperature was lowered to obtain a silicon oxide composite material with carbon nanotubes grown in situ.

[0065] The SEM experiment of the present invention is carried out on S-4800, and the following examples are all the same.

[0066] The SEM image o...

Embodiment 2

[0073] This embodiment provides a specific method for preparing a silicon-based negative electrode material, including:

[0074] First, after fully mixing the commercial silicon oxide powder and nano-iron oxide in a high-speed VC machine, the catalyst-loaded silicon oxide powder is obtained; the weight fraction of nano-iron oxide is 5 / 10,000;

[0075] Second, the silicon oxide powder of the above-mentioned loaded catalyst is placed in a high-temperature rotary furnace, and the Ar:H 2 =1:0.1 under the mixed gas, the temperature was raised to 900°C, acetylene gas equal to hydrogen gas was introduced, and the temperature was kept for 4 hours, then the acetylene gas was stopped, and the temperature was lowered to obtain a silicon oxide composite material with carbon nanotubes grown in situ.

[0076] The Raman spectrum of the material obtained in this embodiment is shown in Figure 7 . Depend on Figure 7 It can be seen that at 475cm -1 There are bulges of amorphous silicon;

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Abstract

The invention discloses a silicon-based negative electrode material of a lithium ion battery, a preparation method of the silicon-based negative electrode material, and a battery. The silicon-based negative electrode material is prepared by the compounding of 90wt%-99.9wt% of a silicon-based material and 0.1wt%-10wt% of carbon nano tubes and / or carbon nano fibers which grow on the surface of the silicon-based material in situ. The silicon-based material is a powder material containing electrochemical active silicon and comprises one or a mixture of more of a nano silicon-carbon composite material, a silicon monoxide material, a modified silicon monoxide material and an amorphous silicon alloy, wherein the electrochemical active silicon accounts for 0.1 wt%-90wt% of the silicon-based material. The carbon nano tubes comprise a single-walled carbon nano tube and / or a multi-walled carbon nano tube; the diameter of the carbon nanotubes and / or carbon nanofibers is 0.4-50nm, the length is 10nm-50 microns. The Raman spectrum of the silicon-based negative electrode material of the lithium ion battery has an amorphous bump at 475+ / -10cm<-1>, and / or has crystalline peak at 510+ / -10cm<-1>. When the single-walled carbon nanotube is included, there is an RBM in the range of 100-400cm<-1>. The XRD spectrum of the silicon-based negative electrode material of the lithium ion battery has a diffraction peak at 28.4 degrees + / -0.2 degrees.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a silicon-based negative electrode material for a lithium ion battery, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion batteries have gradually occupied the portable consumer electronics market represented by mobile phones and computers since they first appeared in the 1990s. They also have broad application prospects in the fields of large-scale energy storage and electric vehicles. Lithium-ion battery anode materials have gradually evolved from the initial coke to today's natural graphite, artificial graphite, etc. The technology of carbon-based anodes is very mature. However, the theoretical specific capacity of 372mAh / g can no longer meet people's increasing demand for energy density. The development of new anode materials has become a top priority. [0003] It has basically become an industry consensus that silicon-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/38H01M4/485H01M4/625H01M10/0525B82Y30/00Y02E60/10H01M2004/027H01M4/131H01M4/483H01M4/1391H01M4/386H01M10/052C01B32/162D06M11/74C01B33/113B82Y40/00C01B32/159B01J21/06B01J23/72B01J23/745B01J23/755B01J27/125B01J27/128B01J27/25B01J35/023B01J37/0236B01J37/08C01B2202/02C01B2202/06C01B2202/22C01B2202/34C01B2202/36C01P2002/72C01P2002/82H01M4/364H01M2004/021
Inventor 罗飞刘柏男褚赓陆浩
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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