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石墨型C₃N₄的固态合成及嵌锂性能研究

Solid-state Synthesis of Graphite-like C₃N₄ and Its Reversible Li⁺ Intercalation

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【Author】 Yang,Xiaohuia Wang,Hongjuna Lu,Xifengb Cui,Deliangb Zhang,Shuyong,a(a Education Ministry Key Laboratory of Colloid and Interface Chemistry,School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100)(b State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100)

【机构】山东大学化学与化工学院教育部胶体与界面化学重点实验室；山东大学晶体材料国家重点实验室；

【摘要】采用固态反应方法制备了石墨型C3N4.采用XRD,FTIR,XPS对产物的组成和结构进行了表征.研究了石墨型C3N4的电化学行为,并将其用作负极材料组装成锂离子电池进行测试,发现该材料具有一定的嵌锂能力,但比容量低,循环寿命短.采用少量嵌入Mg2+,Al3+的方法对石墨型C3N4进行改性,结果发现石墨型C3N4的充放电性能得到一定改善.更多还原

【Abstract】 Graphite-like carbon nitride(g-C3N4) was synthesized using a solid state method and characterized by XRD,FTIR and XPS.The electrochemical properties of the g-C3N4 were studied using both cyclic voltammetry and charge-discharge cycling.It was found that the g-C3N4 sample showed certain reversible intercalation capacity of Li+,but the capacity dropped sharply during the first few cycles.The poor reversi-bility could be ascribed mainly to the decomposition of C3N4 upon electroreduction.Modification of the g-C3N4 was performed by intercalating a little amount of Mg2+ and Al3+ into its interlayer spacing,which made slight improvement on the crystallization and the reversible Li+ intercalation of the residual g-C3N4.更多还原