基于纤维素/木聚糖/木质素炭材料的电化学性能研究

Electrochemical Performance of Cellulose/Xylan/Lignin-Based Char Materials

生物炭材料在储能领域具有广阔的应用前景。为探究生物质原料对生物炭电化学性能的影响,以纤维素、木聚糖和木质素这三种常见的生物质模型化合物为原料,首先采用热解技术在管式炉中分别制备出三种不同类型的焦炭,并利用热重分析生物质原料的热失重特性。实验发现,三种原料的热重/微分热重曲线存在显著区别。之后针对这三种焦炭的石墨化情况及其作为负极材料的电化学性能进行了系统研究。X射线衍射测试结果显示三种焦炭的石墨化结晶非常相似。电化学测试结果表明,纤维素炭负极的储钠容量最高,且具有优良的倍率性能和良好的恢复性。

Biochar materials have shown broad prospects in the field of energy storage.To explore the effect of biomass on the electrochemical performance of biochar,biomass model compounds,including cellulose,xylan and lignin,were utilized to prepare three kinds of char through pyrolysis in tube furnace.Firstly,the thermogravimetric analysis of feedstocks was conducted.It showed that the thermogravimetry/differential thermogravimetry curves of the three raw materials were significantly different.Then the graphitization of these three chars and their electrochemical properties as anode materials were systematically investigated.X-ray diffraction results indicated similar graphitization crystallizations among the three kinds of char.The electrochemical testing results demonstrated that the cellulose char as anode material exhibited the highest sodium storage capacity,excellent rate performance,and fine recovery ability.