FeTiO3/rGO复合材料的制备与电化学性能  

Preparation and lithium storage properties of FeTiO3/rGO composites

作　　者：黄美云 蒋昊文 阳艳 陈宗妮 文衍宣[1] 苏静[1] HUANG Mei-yun;JIANG Hao-wen;YANG Yan;CHEN Zong-ni;WEN Yan-xuan;SU Jing(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2022年第4期1069-1075,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(21606055,51864005);广西自然科学基金重点项目(2018GXNSFDA281014)。

摘　　要：以Fe-ZIF为模板合成了TiO@Fe-ZIF/GO前驱体,并通过进一步热处理获得锂离子电池FeTiO/rGO复合阳极材料。电化学测试结果表明,FeTiO/rGO复合材料在200mA/g电流密度下循环300圈后放电比容量为634mA·h/g,在1 000mA/g电流密度下循环400圈后放电比容量仍为536mA·h/g,并且表现出了优秀的倍率循环性能。这种优异的电化学性能归因于ZIF在石墨烯纳米片上的原位生长,使得石墨烯既起到导电框架的作用,又起到体积缓冲剂的作用,克服了过渡金属钛酸盐导电性差、以及多次循环过程中产生的不可逆晶型变化等缺点,提升了负极材料的储锂性能。TiO@Fe-ZIF/GO precursor was synthesized using Fe-ZIF as a template, and FeTiO/rGO composite anode material was obtained by further heat treatment.The electrochemical test results show that the specific discharge capacity of FeTiO/rGO composites is 634 mA·h/g after 300 cycles at 200 mA/g and 536 mA·h/g after 400 cycles at a higher current density of 1 000 mA/g.This excellent electrochemical performance is due to ZIF’s in situ growth in graphene, making graphene have the effect of the conductive framework and the impact of the buffer.The composite electrode has overcome the disadvantage of transition metal titanium acid salts, such as poor electrical conductivity and irreversible crystal shape change during the cycle process.

关 键 词：锂离子电池 石墨烯 ZIF FeTiO3 

分 类 号：TQ138.1[化学工程—无机化工]