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Tailoring MoO 2 /Graphene Oxide Nanostructures for Stable, High‐Density Sodium‐Ion Battery Anodes
Author(s) -
Huang Jianfeng,
Xu Zhanwei,
Cao Liyun,
Zhang Qinglin,
Ouyang Haibo,
Li Jiayin
Publication year - 2015
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500160
Subject(s) - gravimetric analysis , materials science , graphene , anode , battery (electricity) , oxide , electrochemistry , chemical engineering , sodium ion battery , nanostructure , nanoparticle , electrode , current density , nanotechnology , chemistry , metallurgy , organic chemistry , faraday efficiency , power (physics) , physics , quantum mechanics , engineering
A preform‐decomposition process is employed to prepare a composite of MoO 2 nanoparticles (≈100 nm) anchored on graphene oxide (MoO 2 /GO) for sodium‐ion battery anodes. The discharge gravimetric (volumetric) capacity of the MoO 2 /GO is 483 mAh g −1 (by active material ≈2318 mAh cm −3 ) at the current density of 100 mA g −1 after 10 cycles. After 100 cycles, the discharge gravimetric (volumetric) capacity was maintained at 345 mAh g −1 (≈1656 mAh cm −3 ) and stabilized. During the first 1000 cycles, the capacity degradation is only 1.9 % for each 100 cycles, and the electrode is still able to deliver 276 mAh g −1 after 1000 cycles. Moreover, the nanostructures are able to withstand high rate cycling, the capacity can be fully recovered after being cycled at a rate as high as 2000 mA g −1 . The promising electrochemical performance can be attributed to the high electronic conductivity of MoO 2 and the connected nanostructures, which facilitate both fast electronic and ionic transport.