期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 48, 页码 24245-24253出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05924k
关键词
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资金
- National Natural Science Foundation of China [21401093]
- Program for Liaoning Excellent Talents in University [LNET LR2015036]
- Opening Funds of State Key Lab of Chemical Resource Engineering
Molybdenum oxide is an attractive anode material for lithium ion batteries because of its environmental benignity and high capacity. However, molybdenum oxide suffers from serious capacity fading caused by large volume changes and poor rate capability due to low conductivity. In this work, ultrathin N-doped carbon layer encapsulated MoO3 nanosheets have been synthesized by a simultaneous pyrolysis-reduction process of dodecylamine-intercalated MoO3 composites at 600 degrees C under a nitrogen atmosphere. This special 2D nanosheet morphology can greatly shorten the diffusion length of both electrons and ions, which can ensure the fast kinetics of Li+ intercalation and deintercalation, resulting in high rate performance. Furthermore, N-doped carbon encapsulated MoO3 nanosheets exhibited good electrical conductivity, uniform dispersion and ultrathin thickness. On the basis of these combined effects, the as-fabricated nanosheets can reach high initial charge and discharge capacities of 1610 and 1359 mA h g(-1), respectively, and show remarkable cycle stability with a specific capacity of 1250 mA h g(-1) after 60 cycles at 0.3C rate. High specific discharge capacities are maintained at fast C rates, e.g., 1370, 1010, 940, 610, 490 and 370 mA h g(-1) at 0.3C, 1C, 2C, 4C, 10C, and 20C, respectively.
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