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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
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
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
graphite-like C3N4
solid-state synthesis
electrochemical property
lithium-ion battery
reversi- ble lithium intercalation