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无机材料学报

无机材料学报

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水合氧化钛制备Li4Ti5O12及在电化学混合电容器中的应用

臧 戈, 包丽颖, 苏岳锋, 吴 锋, 陈 实   

  1. 北京理工大学 化工与环境学院 国家高技术绿色材料发展中心, 北京 100081
  • 收稿日期:2008-06-04 修回日期:2008-12-01 出版日期:2009-05-20 网络出版日期:2009-05-20

Preparation of Li4Ti5O12 with Hydration Titanium Dioxide for Electrochemical Hybrid Capacitor

ZANG Ge, BAO Li-Ying, SU Yue-Feng, WU Feng, CHEN Shi   

  1. School of Chemical Engineering & Environment, Beijing Institute of Technology, National Development Center of HiTech Green Materials, Beijing 100081, China
  • Received:2008-06-04 Revised:2008-12-01 Published:2009-05-20 Online:2009-05-20

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1840

被引次数

1

摘要： 以水合氧化钛溶胶为起始反应物，在其中加入活性炭、柠檬酸和锂盐，干燥后在800℃热处理12h，制得具有尖晶石结构的新型准纳米晶Li4Ti5O12. 电化学测试表明，该材料的首次嵌脱锂效率可达99.3%，85mA/g电流条件下的可逆嵌锂容量为152.3mAh/g，嵌脱锂平台稳定. 将其制成嵌锂电极后与活性炭电极构成Li4Ti5O12/AC电化学混合电容器. 充放电测试表明，在该混合电容器中，Li4Ti5O12电极在85mA/g电流条件的比电容量为96.4mAh/g，电容器充放电效率达96.5%.

关键词: 电化学混合电容器, 水合氧化钛, Li4Ti5O12

Abstract: A novel pseudonanocrystalline Li4Ti5O12 spinel was prepared using hydration titanium dioxide as starting materials. Hydration titanium dioxide added with activated carbon, citric acid and lithium salt was heattreated at 800℃ in air for 12h after desiccation. The spinel shows a good lithiation performance. Its reversible capacity is more than 152.3mAh/g at current density of 85mA/g, the first chargedischarge efficiency is 99.3% and its chargedischarge potential is flat and steady. Then, the Li4Ti5O12/AC hybrid capacitors using Li4Ti5O12 as the anode and activated carbon as the cathode is assembled. Electrochemical tests show that at current density of 85mA/g, the specific capacity of Li4Ti5O12 electrode is 96.4mAh/g and the efficiency of hybrid capacitor is 96.5%.

Key words: electrochemical hybrid capacitor, hydration titanium dioxide, Li4Ti5O12

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