介孔α-Fe2O3纳米线的制备与电化学性能研究.doc

文档介绍：
介孔α-Fe2O3 纳米线的制备与电化学性能
研究#
梁聪聪,程丹妃,汪飞**
5
10
(西安交通大学理学院,西安 710049)
摘要:本文采用有机液相合成路线制备了 FeOOH 纳米线。SEM 和 TEM 分析结果表明:
FeOOH 纳米线为针状、单晶结构,长度在几微米范围。500℃下热处理 3 小时后,针状、单
晶 FeOOH 纳米线转变为介孔α-Fe2O3 纳米线。将其作为锂离子电池负极材料使用时,其一
维、介孔结构可显著提高电极/电解液接触面积,降低锂离子传输距离并能有效缓解充放电
过程中体积变化的影响,有利于提高 Fe2O3 负极材料的循环性能。电化学测试结果表明:介
孔α-Fe2O3 纳米线在 充放电速率下,10 次循环后的放电容量仍达到 935mAh/g。
关键词:二次能源;锂离子电池;负极材料;氧化铁;介孔纳米线
中图分类号:TM912
15
The preparation and electrochemical performance of
mesoporous α-Fe2O3 nanowires
LIANG Congcong, CHENG Danfei, WANG Fei
(School of Science, Xi'an Jiaotong University, Xi'an 710049)
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25
30
35
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Abstract: The paper presents anic liquid route to prepare FeOOH nanowires. SEM and
TEM show that the nanowires exhibit needle-like morphology and single-crystal structure with the
length of several micrometers. The FeOOH nanowires can be transformed to mesoporous α-Fe2O3
nanowires after heat-treating at 500℃ for 3 h. When used as anode materials for lithium-ion
batteries, the α-Fe2O3 with 1 D and mesoporous structure is beneficial to improve the contact
area of electrode/electrolyte, reduce the diffusion distance of Li+ and modate the strain
associated with severe volume variations during lithiation/delithiation processes. Electrochemical
tests show that the discharge capacity of mesoporous α-Fe2O3 nanowires is maintained at 935
mAh/g after 10 cycles.
Key words: se