Unlock instant, AI-driven research and patent intelligence for your innovation.

A high-capacity silicon-carbon negative electrode material, preparation method and application

A negative electrode material and high-capacity technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of high preparation cost, low conductivity volume effect, complex preparation process, etc., to achieve suitable Industrialization, obvious capacity improvement, and simple preparation process

Active Publication Date: 2020-06-12
HUBEI ENG UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphite is the most widely used carbon-based lithium battery negative electrode material, and its highest theoretical specific capacity is only 372mAh g -1 , the actual specific capacity is lower, and the cycle stability is difficult to effectively improve
Therefore, there is an urgent need for a high specific capacity negative electrode material to be developed to replace graphite. Silicon has a high theoretical specific capacity (4200mAh / g) and is rich in content. It is considered to be a very potential negative electrode material, but due to the low conductivity of silicon rate and the volume effect that occurs in the charging and discharging process, resulting in the delay in its practical application and industrialization
[0003] At present, most of the research on silicon-carbon anodes starts from the structure of the material. By preparing carbon-coated silicon or silicon-coated carbon anode materials, although this type of method can obtain a high capacity in a certain sense, the preparation process is complicated and industrialized. The high cost and high requirements for equipment have led to the fact that most of the current similar research stays at the laboratory level, and there is still a long way to go before industrialization in the true sense.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high-capacity silicon-carbon negative electrode material, preparation method and application
  • A high-capacity silicon-carbon negative electrode material, preparation method and application
  • A high-capacity silicon-carbon negative electrode material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The invention provides a method for preparing a high-capacity silicon-carbon negative electrode material, comprising the following steps:

[0023] The silicon source, the graphite powder and the ball milling medium are mixed, subjected to wet ball milling treatment, suction filtered, and dried to obtain a high-capacity silicon-carbon negative electrode material.

[0024] Preferably, the silicon source includes 150-250 mesh silicon powder, and the ball milling medium includes ethanol.

[0025] Preferably, the mass ratio of silicon source: graphite powder is 1:3-6, and the solid-liquid ratio of ethanol: silicon source and graphite powder is 2:1-5:1.

[0026] Preferably, the silicon source is added to the ball mill, part of the graphite powder is added for the first ball milling treatment, and the remaining graphite powder is added for the second ball milling treatment.

[0027] More preferably, the graphite powder added in the first ball milling treatment is 75%-85% of t...

Embodiment 1

[0045] A method for preparing a high-capacity silicon-carbon negative electrode material, the specific steps are as follows:

[0046] 150 mesh silicon powder and graphite powder are accurately weighed with a mass ratio of 1:3, initially mixed, and ball milled by a ball mill with ethanol as a medium (liquid-material ratio 4:1), ball milling speed 250r / min, time 1 hour 20 Minutes, the pre-product is obtained by suction filtration and drying, doped with 5wt% graphite in the pre-product, carries out secondary ball milling treatment with ethanol as medium (liquid-to-solid ratio 4:1) through ball milling for 1 hour and 30 minutes, and suction filtration and drying Dry grinding, pass through 200 mesh sieve, see the SEM image of the product figure 2 ,Depend on figure 2 It can be seen from the SEM images in the figure that a few nano-silicon particles are embedded in the layered graphite structure.

Embodiment 2

[0048] A method for preparing a high-capacity silicon-carbon negative electrode material, the specific steps are as follows:

[0049] 200 mesh silicon powder and graphite are accurately weighed with a mass ratio of 1:4, initially mixed, and ball milled with ethanol as a medium (liquid-to-solid ratio 4:1) by a ball mill. The ball milling speed is 250r / min, and the time is 1 hour and 20 minutes. The pre-product is obtained by suction filtration and drying, and the pre-product is doped with 10wt% graphite, and is subjected to ball milling with ethanol as a medium (liquid-to-solid ratio 4:1) for 1 hour and 30 minutes, and suction filtration, drying and grinding , through a 200-mesh sieve, the SEM image of the product is shown in image 3 ,Depend on image 3 It can be seen from the SEM images in the figure that a few nano-silicon particles are embedded in the layered graphite structure.

[0050] The XRD diagram of the product is shown in figure 1 ,Depend on figure 1 It can be s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a high-volume silicon carbide cathode material as well as a preparation method and application thereof. The preparation method comprises the steps of mixing a silicon source, graphite powder and a ball-milling medium, carrying out wet-process ball-milling treatment, carrying out suction filtration, and drying, so as to obtain the high-volume silicon carbide cathode material. The preparation method has the beneficial effects that the raw material sources are rich, the preparation process is simple, the prepared cathode material has excellent electrochemical cycle performance, the volume is obviously increased, and the preparation process is simple and suitable for industrialization.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a high-capacity silicon-carbon negative electrode material, a preparation method and an application. Background technique [0002] As a new type of high-energy battery, lithium-ion battery has been widely used in people's daily life. As the main component of the lithium battery, the negative electrode material directly affects the performance of the lithium battery. At present, graphite is the most widely used carbon-based lithium battery negative electrode material, and its highest theoretical specific capacity is only 372mAh g -1 , the actual specific capacity is lower, and the cycle stability is difficult to effectively improve. Therefore, there is an urgent need for a high specific capacity negative electrode material to be developed to replace graphite. Silicon has a high theoretical specific capacity (4200mAh / g) and is rich i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 杜军李先明王锋付争兵丁瑜杨雄王丽潘璐
Owner HUBEI ENG UNIV