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

Lithium battery

A lithium battery, non-aqueous electrolyte technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problem that the charging and discharging characteristics of lithium batteries cannot be fully improved.

Inactive Publication Date: 2004-09-22
SANYO ELECTRIC CO LTD
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, even when a vinylene carbonate compound is added to the above-mentioned non-aqueous solvent, there is still a problem that the charge-discharge characteristics of the lithium battery cannot be sufficiently improved.

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
  • Lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In embodiment 1, made diameter 24.0mm, thickness 3.0mm such as figure 1 A flat coin-type laboratory battery is shown.

[0046] In order to make the working electrode for forming the negative electrode of this experimental battery, a carbon material made as follows was used, that is, after making graphite powder (d 002 = 0.336nm, L C >100nm) is immersed in molten pitch, and the surface of the graphite powder is covered with pitch by drying it, and the graphite covered with pitch is fired at 1100° C. in a nitrogen atmosphere for 2 hours, so that the graphite The surface is covered with low crystalline carbon. Furthermore, when the surface of the graphite powder was covered with pitch as described above, in this Example 1, the coating amount of the pitch was 8 parts by weight with respect to 100 parts by weight of the graphite powder.

[0047] In addition, the above-mentioned carbon material was irradiated with an argon ion laser with a wavelength of 514.5 nm using a Ra...

Embodiment 2～6 and comparative example 1、2

[0055] In embodiment 2~6 and comparative example 1,2, the amount of vinyl vinyl carbonate (VEC) and ethylene carbonate (VC) added in the non-aqueous electrolytic solution of described embodiment 1 is changed, Except for this, in the same manner as in the case of the above-mentioned Example 1, each experimental battery of Examples 2 to 6 and Comparative Examples 1 and 2 was produced.

[0056] Here, the amounts of vinyl vinyl carbonate (VEC) and ethylene carbonate (VC) added to 100 parts by weight of the non-aqueous electrolytic solution were changed to, in Example 2, 10 parts by weight of vinyl vinyl carbonate Ester (VEC), 2 parts by weight ethylene carbonate (VC), in embodiment 3 is 5 parts by weight vinyl vinyl carbonate (VEC), 4 parts by weight ethylene carbonate (VC), in embodiment 4 is 10 Parts by weight of ethylene carbonate (VEC), 4 parts by weight of ethylene carbonate (VC), are 5 parts by weight of ethylene carbonate (VEC) in embodiment 5, do not add ethylene carbonate...

Embodiment 7

[0066] In embodiment 7, in making the working pole of the negative electrode of described embodiment 1, use the same graphite powder as described embodiment 1 (d 002 = 0.336nm, L C >100nm), after this graphite powder is immersed in the pitch of molten state, when by making it dry and cover the surface of graphite powder with pitch, make relative to 100 weight parts of graphite powder, the covering amount of pitch reaches 5 parts by weight, Except for this, in the same manner as in the case of the above-mentioned Example 1, a carbon material was produced, and at the same time, a working electrode to be a negative electrode was produced.

[0067] Here, for this carbon material, the R value (I D / I G ) and R A value (I A / I G ), the results are shown in the following table 2, the R value (I D / I G ) is 0.31, R A value (I A / I G ) is 0.12.

[0068] In addition, except for using the working pole, as in the case of the above-mentioned Example 3, 5 parts by weight of ethyl...

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

A lithium cell includes a positive electrode, a negative electrode employing a carbon material as an active material, and a non-aqueous electrolyte including a solute dissolved in a non-aqueous solvent, and is characterized in that the carbon material in the negative electrode has an RA value (IA / IG) of 0.05 or more, the RA value calculated from a peak intensity (IA) of a broad peak PA having a full width at half maximum of 100 cm<-1 >or more and a peak intensity (IG) in the vicinity of 1580 cm<-1 >as determined by laser Raman spectroscopy using an argon ion laser having a wavelength of 514.5 nm, the peak intensity (IA) determined from a peak PD in the vicinity of 1360 cm<-1>, as determined by the aforesaid laser Raman spectroscopy, which is separated into the broad peak PA having the full width at half maximum of 100 cm<-1 >or more and a peak PB having a full width at half maximum of less than 100 cm<-1>.

Description

technical field [0001] The invention relates to a lithium battery having a positive electrode, a negative electrode using a carbon material as an active material, and a non-aqueous electrolytic solution in which a solute is dissolved in a non-aqueous solvent, and particularly relates to a lithium battery having an excellent battery obtained by using an appropriate carbon material in the negative electrode. The characteristics of the charge and discharge characteristics of the lithium battery. Background technique [0002] In recent years, lithium batteries using a non-aqueous electrolytic solution in which a solute is dissolved in a non-aqueous solvent and utilizing a high electromotive force of oxidation and reduction of lithium have been widely used as new batteries with high output and high energy density. [0003] Here, in such a lithium battery, carbon materials such as graphite or coke that can realize insertion and extraction of lithium ions are used as the material u...

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
IPC IPC(8): H01M10/05H01M4/36H01M4/587H01M6/16H01M10/0525H01M10/0567H01M10/0569
CPCH01M4/587H01M10/0525H01M2300/0037H01M4/133Y02E60/122Y02E60/10B42D1/007G09B1/06
Inventor 柳田胜功柳井敦志喜田佳典池町隆明能间俊之小笠原毅
Owner SANYO ELECTRIC CO LTD
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