中空结构TiO_2基锂离子电池负极材料的合成与电化学性能
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- 英文论文题名：Synthesis of hybrid TiO_2 hollow spheres with enhanced electrochemical properties as lithium batteries anode materials
- 论文作者：刘瑞平 ; 苏伟明 ; 贺鹏 ; 张超 ; 沈超
- 英文论文作者：Ruiping Liu ; Weiming Su ; Peng He ; Chao Zhang ; Chao Shen ; Department of Materials Science and Engineering ; China University of Mining & Technology(Beijing)
- 年：2016
- 作者机构：中国矿业大学(北京)材料系;
- 论文关键词：TiO_2 ; 锂离子电池 ; 负极材料 ; 电化学性能
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TQ134.11;TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：208k
- 原文格式：D
- 会议级别：全国
摘要
本文以水合硫酸盐为模板辅助溶剂热法合成了表面光滑但内部腔道结构复杂的二氧化钛空心球,平均孔径为1.695nm,比表面积较高,可达224m~2/g。该种制备方法制备的二氧化钛空心球壁厚可达到1μm左右,随着加入钛源浓度的降低,空心球的壁厚减小。同时,采用不同的水合硫酸盐为模板,可以对二氧化钛空心球进行不同的掺杂,成功制备了中空结构TiO_2/ZnO、TiO_2/MgO、TiO_2/Co_2O_3、TiO_2/Fe_2O_3复合微球。电化学测试结果表明,不同氧化物掺杂的中空结构TiO_2微球的电化学性能也不同,其中Fe_2O_3的复合可以在很大程度上改善TiO_2的电化学性能,其在0.1C和1C的电流密度下充放电循环100次后其放电比容量分别为188mAh/g和153mAh/g。样品在0.1C、0.2C、0.5C、1C、5C、10C的电流密度下分别进行10个循环后的放电比容量分别为379mAh/g、203mAh/g、157mAh/g、132mAh/g、100mAh/g和64mAh/g,然后恢复到0.1C的电流密度时,其放电比容量仍可达219mAh/g。上述结果表明其具有较好的充放电循环性能和倍率性能。
In the present research,hierarchically porous hybrid TiO_2 hollow spheres were solvothermally synthesized successfully by using tetrabutyl titanate as titanium precursor and hydrated metal sulfates as soft templates.The as-prepared TiO_2 spheres with hierarchically pore structures and high specific surface area and pore volume consisted of highly crystallized anatase TiO_2 nanocrystals hybridized with a small amount of metal oxide from the hydrated sulfate.The TiO_2/ZnO,TiO_2/Fe_2O_3,TiO_2/MgO,and TiO_2/Co_2O_3 spheres can be easily synthesized using the above one-step synthesis strategy.The results show that the TiO_2/Fe_2O_3 delivers 188 mAh/g and 153 mAh/g at0.1C and 1C after 100 cycles.The TiO_2/Fe_2O_3 exhibits the highest discharge capacities of 379mAh/g at 0.1C,203mAh/g at 0.2C,157mAh/g at 0.5C,132mAh/g at 1C,100mAh/g at 5C and 64mAh/g at IOC.The preliminary results demonstrate that TiO_2 hybrid hollow spheres are potential candidate for anode material of lithium ion batteries.
In the present research,hierarchically porous hybrid TiO_2 hollow spheres were solvothermally synthesized successfully by using tetrabutyl titanate as titanium precursor and hydrated metal sulfates as soft templates.The as-prepared TiO_2 spheres with hierarchically pore structures and high specific surface area and pore volume consisted of highly crystallized anatase TiO_2 nanocrystals hybridized with a small amount of metal oxide from the hydrated sulfate.The TiO_2/ZnO,TiO_2/Fe_2O_3,TiO_2/MgO,and TiO_2/Co_2O_3 spheres can be easily synthesized using the above one-step synthesis strategy.The results show that the TiO_2/Fe_2O_3 delivers 188 mAh/g and 153 mAh/g at0.1C and 1C after 100 cycles.The TiO_2/Fe_2O_3 exhibits the highest discharge capacities of 379mAh/g at 0.1C,203mAh/g at 0.2C,157mAh/g at 0.5C,132mAh/g at 1C,100mAh/g at 5C and 64mAh/g at IOC.The preliminary results demonstrate that TiO_2 hybrid hollow spheres are potential candidate for anode material of lithium ion batteries.
引文
[1]Yang Chen,Xiaoqing Ma,Xiaoli Cui,Zhiyu Jiang,Journal of Power Sources.2016,302:233-239.
[2]Ruiping Liu,Feng Ren,Weiming Su,,et al,Frontiers of materials science.2016,10:15-22.
[3]Wentao Li,Kaina Shang,Yongmei Liu,et al,Electrochimica Acta.2015,174:985-991
[2]Ruiping Liu,Feng Ren,Weiming Su,,et al,Frontiers of materials science.2016,10:15-22.
[3]Wentao Li,Kaina Shang,Yongmei Liu,et al,Electrochimica Acta.2015,174:985-991