摘要
为了提高TiO_(2)负极材料的导电能力和储钠性能,在低共熔溶剂中采用溶胶凝胶水热法制备TiO_(2)/纤维素复合前驱体,再经热处理获得TiO_(2)/C负极材料,分析了水热温度对材料结构、形貌和电化学性能的影响。80℃条件下制备的电极材料TiO_(2)晶型完整,在1 C电流条件下循环200圈后放电比容量为189.5(mA·h)/g,容量保持率达到80%;在电流为5 C的大倍率条件下充放电2000圈后容量仍保持在152.9(mA·h)/g,循环稳定性优异。
The TiO_(2)/cellulose precursor was prepared by sol-gel following hydrothermal method in deep eutectic solvents,and then the TiO_(2)/C composite material was obtained by heat treatment.The effect of hydrothermal temperature on the structure,morphology and electrochemical performance of the material was analyzed.The electrode material prepared at a mild hydrothermal temperature of 80℃has a perfect crystal structure of the TiO_(2).The TiO_(2)/C composite material has a discharge specific capacity of 189.5(mA·h)/g after 200 cycles at 1 C current,and the capacity retention rate reaches 80%.At a larger current of 5 C,the capacity remains at 152.9(mA·h)/g after 2000 cycles,and shows excellent stability.
作者
陈宗妮
黄美云
蒋昊文
文衍宣
龙云飞
覃杏珍
苏静
CHEN Zong-ni;HUANG Mei-yun;JIANG Hao-wen;WEN Yan-xuan;LONG Yun-fei;QIN Xing-zhen;SU Jing(School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2021年第4期1083-1090,共8页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(21606055,51864005)
广西自然科学基金重点项目(2018GXNSFDA281014)。
关键词
纤维素
低共熔溶剂
二氧化钛
钠离子电池
负极材料
cellulose
deep eutectic solvents
titanium dioxide
sodium-ion battery
anode material
作者简介
通讯作者:苏静(1983—),女,广西钦州人,广西大学副教授,博士,E-mail:sujing928@126.com。
