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A silicon oxide/carbon composite nanowire negative electrode material, preparation method and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in the field of electrochemistry, can solve the problems of limited electrical conductivity and low volume expansion rate, and achieve the effects of delaying pulverization and buffering volume changes

Active Publication Date: 2019-07-26
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the huge volume expansion rate (>300%) and low electrical conductivity of silicon materials limit its commercial application.

Method used

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  • A silicon oxide/carbon composite nanowire negative electrode material, preparation method and lithium ion battery
  • A silicon oxide/carbon composite nanowire negative electrode material, preparation method and lithium ion battery
  • A silicon oxide/carbon composite nanowire negative electrode material, preparation method and lithium ion battery

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preparation example Construction

[0043] The present invention also provides a method for preparing a silicon oxide / carbon composite nanowire negative electrode material, the method comprising:

[0044] Step S101, providing SiOx nanowire material.

[0045] Specifically, after mixing silicon and silicon dioxide in a predetermined mass ratio, they are heated to a predetermined temperature in a high vacuum environment to grow SiOx nanowire materials;

[0046] SiOx nanowire materials with a predetermined diameter range are screened out, and the screened SiOx nanowire materials are granulated or spheroidized to obtain SiOx nanowire particles with a predetermined particle size distribution range.

[0047] Wherein, the mass ratio of silicon and silicon dioxide is 0.8-1.2:2, such as 0.8:2, 1:2, 1.2:2; the temperature range for growing SiOx nanowire materials is 1000-1400°C, and the holding time range is 2- 30h, the diameter range of the grown SiOx nanowire material is 5-200nm.

[0048] It can be understood that the ...

Embodiment 1

[0069] The preparation method of SiOx nanowire material is as follows:

[0070] (1) Place 980 g of commercially purchased silicon powder raw materials and 2000 g of silicon micropowder raw materials in a VC mixer, mix at a speed of 998 rpm, and hold for 30 minutes to fully mix the two to obtain nanowire raw materials.

[0071] (2) Place 2980g of uniformly mixed raw materials in the reaction chamber of a horizontal vacuum furnace, and put a collector in the collection chamber; heat to 1350°C under vacuum conditions to make the nanowire raw materials react, and the gaseous products in the reaction process pass through rapidly. Condensation generates SiOx nanowire material, and the product is collected after the reaction.

[0072] (3) Observing the morphology and structure of the prepared nanowire material using a scanning electron microscope, the test results are as follows: Figure 4 shown by Figure 4 It can be seen that the diameter of the prepared nanowire material is unif...

Embodiment 2

[0074] The preparation method of silicon oxide / carbon composite nanowire negative electrode material is as follows:

[0075] (1) choose 4000g by the SiOx nanowire material that embodiment 1 makes, as Figure 5 As shown, the selected SiOx nanowire materials have uniform diameters, such as 54.4nm, 56.2nm, 59.6nm, and 60.5nm, and their average particle diameter D50 is controlled at about 4um after treatment.

[0076] (2) Put the above-mentioned 4um nanowire material in a vapor deposition furnace, that is, a CVD furnace. Nitrogen gas is passed into the outer path as a protective gas, and methane gas is passed into the inner path as a carbon source. Heating to 900°C makes the methane decompose and coat Agent carbon, the nitrogen flow rate is set to 3.5L / min during the reaction, and carbon is coated on the surface of the SiOx nanowire material and / or in the gap between the SiOx nanowire material, wherein the ratio of carbon to SiOx nanowire material is 27%.

[0077] (3) After the c...

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Abstract

The invention provides a negative electrode material of a silicon oxide / carbon composite nanowire. The negative electrode material comprises a SiO<x> nanowire material and coating agent carbon, wherein the coating agent carbon wraps the SiO<x> nanowire material. The invention also provides a lithium ion battery applying the negative electrode material of the silicon oxide / carbon composite nanowire and a preparation method for the negative electrode material of the silicon oxide / carbon composite nanowire. The negative electrode material of the silicon oxide / carbon composite nanowire, provided by the invention, is beneficial for buffering volume change of the negative electrode material of the silicon oxide / carbon composite nanowire during the charge / discharge process, pulverization is effectively delayed, and the diffusion of an electrolyte in the battery and the contact between the negative electrode material of the silicon oxide / carbon composite nanowire and an active material are facilitated.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a silicon oxide / carbon composite nanowire negative electrode material, a preparation method and a lithium ion battery. Background technique [0002] As mobile phones, notebooks, digital cameras, micro cameras and other electronic products have higher and higher requirements for energy supply equipment, especially the rapid development of electric vehicles and other power vehicles, it is particularly urgent to develop new green high-energy chemical power sources. Due to the advantages of specific capacity, high charge and discharge efficiency, good cycle performance and low cost, lithium-ion batteries have become a research hotspot for researchers. As an important part of lithium-ion batteries, negative electrode materials affect the specific energy of lithium-ion batteries. And cycle life has always been the focus of lithium-ion battery research. [0003] Silicon-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M10/0525Y02E60/10
Inventor 庞春雷石晓太任建国岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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