新型炭材料2021，Vol.36Issue(6)：1073-1080,8.DOI:10.1016/S1872-5805(21)60075-6
空气氧化稳定化对沥青基硬炭材料的结构和储钠性能的影响
Effect of the air oxidation stabilization of pitch on the microstructure and sodium storage of hard carbons
摘要
Abstract
Hard carbon anode materials for sodium ion batteries were prepared from petroleum pitch by air oxidation stabiliza-tion followed by carbonization. The effects of the oxidation stabilization temperature on the compositions and microstructures of the oxidized samples, as well as on the morphology, microstructure and sodium storage property of the carbonized samples were invest-igated. Results show that air oxidation introduces a large number of oxygen-containing functional groups, induces dehydrogenation condensation and oxidative crosslinking reactions, and transforms the petroleum asphalt from thermoplastic to thermosetting. The air oxidation stabilization treatment effectively hinders the inherent tendency of asphalt to graphitize during high temperature carboniza-tion, resulting in carbons with randomly oriented carbon layers with more defects. Electrochemical tests show that o-PDC-350-1400 (oxidation stabilization at 350 ℃, carbonization at 1400 ℃) has a high charging specific capacity of 276.8 mAh g?1 at 100 mA g?1 and a high initial coulombic efficiency of 73.38％. Compared with sample PDC-1400 that was directly carbonized at 1400 ℃, the charging specific capacity was increased by about 1.8 times and the initial coulombic efficiency was increased by 22％. The charging specific capacity of o-PDC-350-1400 after 200 cycles reached 170.2 mAh g?1, indicating good cycling stability.关键词
石油沥青/氧化稳定化/硬炭/钠离子电池Key words
Petroleum asphalt/Oxidation stabilization/Hard carbon/Sodium ion battery分类
化学化工引用本文复制引用
郭宏毅,李姚谕,王春雷,贺磊,李晨,郭永强,周颖..空气氧化稳定化对沥青基硬炭材料的结构和储钠性能的影响[J].新型炭材料,2021,36(6):1073-1080,8.基金项目
The authors acknowledge the financial support by the National Natural Science Foundation of China,NSFC(21576047,U1510204,21776040).国家自然科学基金(21576047,U1510204,21776040). （21576047,U1510204,21776040）
