Preparation method of silicon carbon negative electrode material for lithium ion batteries

A lithium-ion battery and negative electrode material technology, which is applied in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems that it is difficult to insert silicon powder into the gap of expanded graphite, increase material costs, and increase material costs, so as to reduce material costs, Achieving cost and improving flexibility

Inactive Publication Date: 2017-11-21
CHINA FIRST AUTOMOBILE
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been many studies on silicon-carbon anode materials, such as patent application number 201210387258.2, a method for preparing silicon-carbon composite materials for lithium-ion batteries and 201210283761.3, a method for preparing anode materials for high-capacity lithium-ion batteries, both of which use silicon powder and expanded graphite Silicon-carbon anode materials are obtained by mixing treatment, but this method is limited by the size of silicon powder and the dispersion process, it is difficult to truly achieve the purpose of inserting silicon powder into the gaps of expanded graphite, and nano-scale silicon powder increases the cost of materials. In addition, all carbon in the 201210387258.2 patent All sources are made of expanded graphite, which greatly increases the cost of materials

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
  • Preparation method of silicon carbon negative electrode material for lithium ion batteries
  • Preparation method of silicon carbon negative electrode material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 500 g of dimethylformamide was added to 12 g of expanded graphite, ultrasonically treated for 40 min, and 214.3 g of tetraethyl orthosilicate was added to the expanded graphite suspension. Prepare 5% nitric acid aqueous solution, take 17 g of nitric acid aqueous solution and add to the above suspension to prepare the precursor suspension. 285.7 g of deionized water was slowly added dropwise to the precursor suspension and vigorously stirred. After standing for 1 hour, the suspension was dried at 80 °C to obtain the precursor. The precursor was fully mixed with 70g Mg powder, placed in an atmosphere furnace, and heated to 700 °C for 3 hours under an argon atmosphere. The reaction product is washed with acid and then water to obtain a silicon-rich material. 10 g of silicon-rich material and 90 g of natural graphite material were mixed and ball-milled to obtain a silicon-carbon anode material. Its specific capacity can reach 372 mAh / g, and its cycle performance can reach ...

Embodiment 2

[0022] Add 150 g of dimethylacetamide to 3 g of expanded graphite, ultrasonically treat for 30 min, and add 60 g of tetraethylorthosilicate to the expanded graphite suspension. A 10% ammonia solution was prepared, and 33 g of the ammonia solution was added to the above suspension to prepare a precursor suspension. 85.7 g of deionized water was slowly added dropwise to the precursor suspension, and vigorously stirred. After standing for 4 hours, the suspension was dried at 80° C. to obtain the precursor. The precursor was fully mixed with 30 g of Mg powder, placed in an atmosphere furnace, and heated to 750 °C for 2.5 hours under an argon atmosphere. The reaction product is washed with acid and then water to obtain a silicon-rich material. 10g of silicon-rich material and 90g of artificial graphite material were mixed and ball-milled to obtain a silicon-carbon anode material with a specific capacity of 431mAh / g and good cycle performance.

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 relates to a preparation method of a silicon carbon negative electrode material for lithium ion batteries. The preparation method is characterized in that the preparation technology specifically comprises the following preparation steps: through expanded graphite pretreatment, precursor turbid liquid configuration, precursor preparation and silicon-enriched material preparation, sufficiently mixing a silicon-enriched material with other negative electrode carbon materials of lithium batteries, and obtaining the silicon carbon negative electrode material through ball-milling, wherein the silicon-enriched material accounts for 10% to 30% of total mass, and the other negative electrode carbon materials of lithium batteries comprise synthetic graphite. According to the method, silica powder is not used as a silicon source, on one hand, the material cost is reduced, and on the other hand, the insertion of silicon among expanded graphite layers is guaranteed, so that the buffer action of expanded graphite on silicon is guaranteed; and moreover, the method uses the other negative electrode carbon materials as a main carbon source, so that the flexibility of the material is improved, the cost is reduced, batch is easily realized, and the controllability of cost and performance are reached.

Description

technical field [0001] The invention relates to a method for preparing a silicon-carbon negative electrode material of a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, as a mature energy storage unit, lithium-ion batteries have been gradually integrated into every part of life. Electrical appliances such as mobile phones and notebooks in life use lithium-ion batteries as their energy storage units. In recent years, lithium-ion batteries have been gradually used in power storage. Electric vehicles are an important application object of lithium-ion batteries. However, the current energy density of lithium-ion batteries still cannot meet the requirements for cruising range of pure electric vehicles. [0003] For a power battery, the factors that most affect its energy density should be the positive electrode material and the negative electrode material. At present, cathode materials are developing towa...

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 Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/58
CPCH01M4/0416H01M4/0471H01M4/362H01M4/583Y02E60/10
Inventor 陈慧明姜涛王丹许德超荣常如韩建张克金
Owner CHINA FIRST AUTOMOBILE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap