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Lithium battery

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

Inactive Publication Date: 2007-12-12
SANYO ELECTRIC CO LTD
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  • 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

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  • Lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In Example 1, a flat coin-shaped experimental battery as shown in FIG. 1 having a diameter of 24.0 mm and a thickness of 3.0 mm was fabricated.

[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 waveleng...

Embodiment 2～6 and comparative example 1、2

[0055] In Examples 2 to 6 and Comparative Examples 1 and 2, the amount of vinyl ethylene carbonate (VEC) and vinylene carbonate (VC) added to the non-aqueous electrolytic solution of Example 1 was added. Except for the change, the experimental batteries of Examples 2 to 6 and Comparative Examples 1 and 2 were produced in the same manner as in the case of Example 1 described above.

[0056] Here, the amounts of vinylethylene carbonate (VEC) and vinylene 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 ethylene carbonate Ethylene carbonate (VEC), 2 parts by weight vinylene carbonate (VC), in embodiment 3 is 5 parts by weight vinylethylene carbonate (VEC), 4 parts by weight vinylene carbonate (VC), in Be 10 parts by weight vinyl ethylene carbonate (VEC), 4 parts by weight vinylene carbonate (VC) in embodiment 4, be 5 parts by weight vinyl ethylene carbonate (VEC) in embodiment 5, do not add ...

Embodiment 7

[0067] 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.

[0068] 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.

[0069] In addition, except for using the working electrode, as in the case of Example 3, 5 parts by weight of vinyl ethylene carbo...

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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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/02H01M10/40H01M10/05H01M4/36H01M4/587H01M6/16H01M10/0525H01M10/0567H01M10/0569
CPCH01M2300/0037Y02E60/122H01M4/133H01M4/587H01M10/0525Y02E60/10B42D1/007G09B1/06
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
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