Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8012058 | Transactions of Nonferrous Metals Society of China | 2017 | 5 Pages |
Abstract
Vanadium (III) phosphate monoclinic VPO4·H2O was synthesized hydrothermally. The É-VOPO4 nanosheets, formed by the oxidative de-intercalation of protons from monoclinic VPO4·H2O, can reversibly react with more than 1 mol lithium atoms in two steps. Crystal XRD analysis revealed that the structure of the É-VOPO4 nanosheets is monoclinic with lattice parameters of α=7.2588(4) Ã
, b=6.8633(2) Ã
and c=7.2667(4) Ã
. The results show that the É-VOPO4 nanosheets have a thickness of 200 nm and uniform crystallinity. Electrochemical characterization of the É-VOPO4 monoclinic nanosheets reveals that they have good electrochemical properties at high current density, and deliver high initial capacity of 230.3 mA·h/g at a current density of 0.09 mA/cm2. Following the first charge cycle, reversible electrochemical lithium extraction/insertion at current density of 0.6 mA/cm2 affords a capacity retention rate of 73.6% (2.0-4.3 V window) that is stable for at least 1000 cycles.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ze-hua CHEN, Yi-zhu MA, Peng-cheng MA, Jian-liang CAO, Yan WANG, Guang SUN, Xiao-dong WANG, Hari BALA, Chuan-xiang ZHANG, Zhan-ying ZHANG,