Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composite negative electrode material for a class of lithium-ion batteries and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as low first Coulomb efficiency and irreversible reactions, achieve good electrochemical cycle stability, improve long-term cycle stability, inhibit the effect of reunion

Active Publication Date: 2015-11-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a composite negative electrode material for a lithium-ion battery and a preparation method for the problems of the irreversible reaction of the first lithium intercalation in the oxide negative electrode material and the low initial Coulombic efficiency.

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
  • Composite negative electrode material for a class of lithium-ion batteries and preparation method thereof
  • Composite negative electrode material for a class of lithium-ion batteries and preparation method thereof
  • Composite negative electrode material for a class of lithium-ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]5.045g SiO, 0.953g metal lithium (the molar ratio of Si / Li is 5:6) and 5g undecane were added into the ball mill jar, high-energy ball milled for 10h (under an inert protective atmosphere), and then the obtained powder was Vacuum drying at 100°C for 24 hours to obtain Si / Li 2 O / Li 4 SiO 4 (molar ratio 4:1:1) composite material. The electrode preparation method, battery assembly, and test conditions are the same as in Comparative Example 1. See Table 1 for test data.

Embodiment 2

[0041] With 4.916g SiO and 1.084g metallic lithium (the molar ratio of Si / Li is 5:7) and 8g dodecane, obtain Si / / Li / Li according to the method for embodiment 1 2 O / Li 4 SiO 4 (molar ratio 4:1:1:1) composite material. See Table 1 for test data.

Embodiment 3

[0043] With 4.812g SiO and 1.213g metallic lithium (the molar ratio of Si / Li is 5:8) and 10g of dedecane, obtain Si / / Li / Li according to the method of embodiment 1 2 O / Li 4 SiO 4 (molar ratio 4:2:1:1) composite material. See Table 1 for test data.

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 composite cathode material for a lithium ion battery and a preparation method thereof, belonging to the chemical power source field. The invention aims to solve the problems that the first lithium ion insertion process of oxide cathode material performs an irreversible reaction, the first coulombic efficiency is low, etc. The preparation method comprises the following steps: using precursor MO, reducing agent metal lithium and a defined amount of organic solvent to perform wet mechanochemical in situ reduction and obtain power, heating the obtained power under vacuum atmosphere to remove organic solvent, and obtaining the composite material. The method of the invention has simple process, low cost and wide application range; and the first efficiency of the prepared composite cathode material is more than 80%, the maximum is more than 95%, and the composite cathode material also has good electrochemical cycle stability.

Description

technical field [0001] The invention relates to a composite negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of chemical power sources. Background technique [0002] Lithium-ion batteries have been widely used in various portable mobile tools, digital products and many other fields because of their high open circuit voltage, high energy density, long cycle life, no pollution, no memory effect and many other advantages. At present, graphite and modified graphite are widely used as anode materials in commercial lithium-ion batteries, and their theoretical capacity is low, so there is little room for further research. The research and application of anode materials for high-capacity lithium-ion batteries has become the key to improving the performance of lithium-ion batteries. In recent years, research on electrochemically reversible intercalation / delithiation anode materials has been very active. Among them, silic...

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): H01M4/38H01M4/48H01M4/58H01M4/04
CPCY02E60/10
Inventor 温兆银王秀艳刘宇林久李宁黄颖宋树丰张群喜
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com