| 摘要 |
The present invention relates to a low nitrogen concentration carbonaceous material with a nitrogen concentration according to glow discharge mass spectrometry of 100 ppm or less, as well as a manufacturing method thereof are provided. A carbonaceous material subjected to a high purification treatment in a halogen gas atmosphere is heat treated under a pressure of 100 Pa or less and at a temperature of 1800° C. or higher, releasing nitrogen in the carbonaceous material and then cooling the material under a pressure of 100 Pa or less or in a rare gas atmosphere.
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