石墨型C_3N_4的固态合成及嵌锂性能研究  

Solid-state Synthesis of Graphite-like C_3N_4 and Its Reversible Li^+ Intercalation

作　　者：杨晓晖[1] 王红军[1] 陆希峰[2] 崔得良[2] 张树永[1] 

机构地区：[1]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,济南250100 [2]山东大学晶体材料国家重点实验室,济南250100

出　　处：《化学学报》2009年第11期1166-1170,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20673068)资助项目

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.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 reversibility could be ascribed mainly to the decomposition of C3N4 upon electroreduction. Modification of the g-C3N4 was performed by intercalating a little amount of Mg^2＋ and Al^3＋ into its interlayer spacing, which made slight improvement on the crystallization and the reversible Li^＋ intercalation of the residual g-C3N4.

关 键 词：石墨型C3N4 固态合成 电化学性质 锂离子电池 可逆嵌锂 

分 类 号：O611.3[理学—无机化学]