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A battery material which has following constitution: a single-layer carbon nanotube having a small diameter is placed into a single-layer carbon nanotube having a large diameter such that the nanotubes are isolated from each other, a boron nitride nanotube is used as an insulating layer, and the car

A battery material which has following constitution: a single-layer carbon nanotube having a small diameter is placed into a single-layer carbon nanotube having a large diameter such that the nanotubes are isolated from each other, a boron nitride nanotube is used as an insulating layer, and the carbon nanotubes and the boron nitride nanotube have a common tube axis; and this material is reduced in mass with respect to a charging capacity, improved in power supply, and free from deterioration.

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1. A battery, comprising: a first single-layer carbon nanotube including a first diameter; a second single-layer carbon nanotube including a second diameter formed inside said first single-layer carbon nanotube; and an insulating layer separating said first and second nanotubes such that said f

1. A battery, comprising: a first single-layer carbon nanotube including a first diameter; a second single-layer carbon nanotube including a second diameter formed inside said first single-layer carbon nanotube; and an insulating layer separating said first and second nanotubes such that said first and second nanotubes are insulated from each other. 2. The battery according to claim 1, wherein said insulating layer comprises a boron nitride nanotube. 3. The battery according to claim 1, further comprising: first and second electrodes connected respectively to the single-layer carbon nanotubes having different diameters and insulated from each other. 4. The battery according to claim 1, wherein the carbon nanotubes and the insulating layer have a common tube axis. 5. The battery according to claim 1, wherein a potential difference exists between the first single-layer carbon nanotube and the second single-layer carbon nanotube to permit charging for storage in said battery, subsequent to discharging. 6. The battery according to claim 2, further comprising: first and second electrodes connected respectively to the single-layer carbon nanotubes having different diameters and insulated from each other by the boron nitride nanotube. 7. The battery according to claim 2, wherein the carbon nanotubes and the boron nitride nanotube have a common tube axis. 8. The battery according to claim 3, wherein the carbon nanotubes and the insulating layer have a common tube axis. 9. The battery according to claim 3, wherein a potential difference exists between the first and second electrodes to permit charging for storage in said battery, subsequent to discharging. 10. The battery according to claim 3, wherein said insulating layer comprises boron nitride layers. 11. The battery according to claim 4, wherein a potential difference exists between the first and second electrodes to permit charging for storage in said battery, subsequent to discharging. 12. The battery according to claim 1, wherein said single-layer carbon nanotubes comprise a platinum metal atom portion. 13. The battery according to claim 1, wherein said battery has an operational charge of 1.6×10-12coulombs and a length of 2.46 cm. 14. The battery according to claim 1, wherein said battery has an operational quantity of stored charge of 0.032 coulomb per gram. 15. The battery according to claim 1, wherein said battery comprises an outer diameter of 100 .ANG.. 16. The battery according to claim 15, wherein said battery has an operational length of 2.36 cm with a volume of 7.72×10-12cm3and a weight of 50×10-12gm. 17. A method of forming battery, comprising: forming a first single-layer carbon nanotube including a first diameter; forming multi-layer boron nitride on an outer-wall of said first single-layer carbon nanotube; and forming a second single-layer carbon nanotube, including a second diameter, on said multi-layer boron nitride, wherein said first single-layer carbon nanotube is partitioned from said second single-layer carbon nanotube layer by said multi-layer boron nitride.