2021 年 89 巻 4 号 p. 382-388
The biomass-derived carbon materials were successfully fabricated by precursor mixtures of eggplants, urea and CaCl2. It is promisingly observed that controlling the mixing ratios of eggplants, urea and CaCl2 can regulate the structures of fabricated carbon materials. On the basis of investigations about correlations between structures and Na+ storage capacity, it is verified that weight ratio of eggplants : urea : CaCl2 = 1 : 2 : 2 is optimal to fabricate the carbon materials, which have the suitable porous structures and specific surface area to store Na+. For instance, the fabricated carbon materials show the Na+ storage capacity is 200.8 mAh/g at 0.1 A/g, after being carried out the charge-discharge 500 times. Meanwhile, the same materials also display the impressive long cycling performance. When cycling the charge-discharge 1000 times at 2.0 A/g, the fabricated carbon materials still manifest the Na+ storage capacity at 137.8 mAh/g.