Claims
- 1. A carbonaceous electrode material for a non-aqueous secondary battery, comprising a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g/cm3, a true density as measured by a helium substitution method of at least 1.7 g/cm3, a hydrogen-to-carbon atomic ratio H/C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m2/g as measured by nitrogen adsorption BET method, and a carbon dioxide adsorption capacity of at least 10 ml/g, wherein the carbonaceous electrode material has been obtained by carbonizing at least one of organic materials originated from genus Pleioblastus and genus Bambusa belonging to bamboo genera of family Gramineae.
- 2. A carbonaceous electrode material according to claim 1, having a potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis.
- 3. A process for producing a carbonaceous electrode material according to claim 1 or 2, comprising: carbonizing the organic material at a temperature of 1000-1400° C. under a reduced pressure or in an inert gas atmosphere.
- 4. A process according to claim 3, further including a de-ashing treatment step for wet-treating the organic material to provide a carbon precursor having a reduced potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis.
- 5. An electrode structure for a non-aqueous solvent-type secondary battery, comprising: an electroconductive substrate and a composite electrode layer disposed on at least one surface of the electroconductive substrate;said composite electrode layer comprising a carbonaceous electrode material according to claim 1 or 2 in a particulate form, and a binder.
- 6. A non-aqueous solvent secondary battery, comprising, a positive electrode, a negative electrode, and a separator and a non-aqueous electrolytic solution disposed between the positive and negative electrodes;at least one of said positive and negative electrodes comprising an electrode structure according to claim 5.
- 7. A secondary battery according to claim 6, wherein the electrode structure constitutes the negative electrode.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-099580 |
Apr 1997 |
JP |
|
Parent Case Info
This application is a 371 application of PCT/JP98/01539 filed Apr. 3, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP98/01539 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/44580 |
10/8/1998 |
WO |
A |
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5741472 |
Sonobe et al. |
Apr 1998 |
A |
Foreign Referenced Citations (4)
Number |
Date |
Country |
0549802 |
Jul 1993 |
EP |
0700106 |
Mar 1996 |
EP |
0758801 |
Feb 1997 |
EP |
0817295 |
Jan 1998 |
EP |