共 19 条
Large-scale synthesis of Li1.2V3O8 as a cathode material for lithium secondary battery via a soft chemistry route
被引:21
作者:
Cao, Xiaoyu
[2
]
Xie, Lingling
[2
]
Zhan, Hui
[1
]
Zhou, Yunhong
[1
]
机构:
[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
[2] Henan Univ Technol, Sch Chem & Chem Engn, Zhengzhou 450001, Peoples R China
关键词:
Sol-gel chemistry;
X-ray diffraction;
Electron microscopy;
Electrochemical measurements;
Electrochemical properties;
LIV3O8;
BEHAVIOR;
D O I:
10.1016/j.materresbull.2008.06.008
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Layered Li1.2V3O8 has been efficiently prepared via a sol-gel method. XRD and particle size analysis indicate that the final product with monoclinic structure consists of homogeneously distributed particles whose sizes are in a very narrow range. There are two different water molecules in the compound according to TGA and DTA. The structural water works as a pillar in the structure and is lost at higher temperature than the combined water. The as-prepared material was also compared with the one synthesized from the conventional solid-state method in terms of their morphology, electrochemistry capacity and electrodynamic characteristics. As a result, the Li1.2V3O8 obtained at 300 degrees C for 10 h has excellent electrochemical properties. A high-first discharge capacity of 286.4 mAh/g was observed at a current rate of C/5 between 1.7 and 3.8 V and the structure of Li1.2V3O8 remains stable in the subsequent cycles. EIS calculation suggests a better diffusion path for lithium ions in as-prepared material than in the solid-state compound. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:472 / 477
页数:6
相关论文