| 水热法制备锂电池正极材料o-LiMnO2及其碳纳米管改性 | |
| Hydrothermal Preparation and Carbon Nanotube Modification of o-LiMnO2 Cathode Materials for Lithium Battery | |
| 摘要: MnCl2、LiOH、EDTA和NaClO混合溶液一步水热反应合成锂离子电池正极材料正交LiMnO2(o-LiMnO2),进一步在反应体系中添加碳纳米管(CNTs)制备碳纳米管改性的o-LiMnO2(o-LiMnO2/CNTs复合材料)。采用X-射线衍射和扫描/透射电镜表征产物的晶体结构、微观形貌,循环伏安法和恒流充放电测试得活性材料电化学性能。结果表明,体系中nLi:nMn控制为8:1,在180℃反应24 h得到目标产物;反应体系中添加CNTs形成复合材料可降低o-LiMnO2颗粒粒径、提高导电率。o-LiMnO2首次放电容量为76.0 mAh·g-1,100周后容量保持为124.1 mAh·g-1;o-LiMnO2/CNTs复合材料首次及100周放电容量(基于o-LiMnO2/CNTs的质量)分别高达94.1和159.8 mAh·g-1。 | |
| 关键词: 锂离子电池 正极材料 正交LiMnO2 水热法 碳纳米管 | |
| 基金项目: 国家自然科学基金(Nos.41171375、20807019)、教育部新世纪优秀人才支持计划(No.NCET-12-0862)、霍英东教育基金会高等院校青年教师基金(No.141024)、湖北省杰出青年人才基金(No. 2012FFA031)和中央高校基本科研业务费专项资金(Nos. 2013PY029、 2011PY030)。 | |
| Abstract: Rechargeable lithium battery cathode materials orthorhombic LiMnO2(o-LiMnO2) was directly synthesized using hydrothermal reaction of MnCl2, LiOH, EDTA and NaClO solutions, and carbon nanotube modified o-LiMnO2(o-LiMnO2/CNTs composite) was further obtained by adding CNTs into the reaction system. The as-prepared samples were characterized by X-ray diffractometer and SEM/TEM, and their electrochemical performance was tested using constant current charge/discharge experiment and cyclic voltammetry. o-LiMnO2 was formed when hydrothermal reaction was performed at 180℃ for 24 h with LiOH/MnCl2 molar ratio as low as 8:1. o-LiMnO2 exhibited the initial discharge capacity of 76.0 mAh·g-1, and cycling capacity of 124.1 mAh·g-1 after 100 cycles. The formation of o-LiMnO2/CNTs composite decreased the particle size and electrochemical resistivity of single o-LiMnO2. The initial discharge capacity was 94.1 mAh·g-1, and increased and then kept stable after 45 cycles, and the cycling capacity was 159.8 mAh·g-1 after 100 cycles. This work facilitates the preparation and electrochemical performance improvement of o-LiMnO2 cathode materials for rechargeable lithium batteries. | |
| Keywords: lithium battery cathode material orthorhombic liMnO2 hydrothermal reaction carbon nanotube | |
| 投稿时间：2014-09-30 修订日期：2014-12-29 | |
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| 刘立虎,陈述林,刘凡,向全军,冯雄汉,邱国红.水热法制备锂电池正极材料o-LiMnO2及其碳纳米管改性[J].无机化学学报,2015,31(4):703-709. | |
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