Nickel oxalate dihydrate nanorods attached to reduced graphene oxide sheets as a high-capacity anode for rechargeable lithium batteries

Title
Nickel oxalate dihydrate nanorods attached to reduced graphene oxide sheets as a high-capacity anode for rechargeable lithium batteries
Author
선양국
Keywords
LI-ION BATTERIES; TRANSITION-METAL OXALATES; LIQUID-ASSISTED SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; NANOSTRUCTURED MATERIALS; THERMAL-DECOMPOSITION; CONVERSION REACTIONS; ELECTRODE MATERIALS; TEMPLATE SYNTHESIS; ENERGY-CONVERSION
Issue Date
2016-05
Publisher
NATURE PUBLISHING GROUP
Citation
NPG ASIA MATERIALS, v. 8, Page. 1-7
Abstract
In the search for high-capacity anode materials, a facile hydrothermal route has been developed to synthesize phase-pure NiC2O4 center dot 2H(2)O nanorods, which were crystallized into the orthorhombic structure without using templates. To ensure the electrical conductivity of the nanorods, the produced NiC2O4 center dot 2H(2)O nanorods were attached to reduced graphene oxide (rGO) sheets via self-assembly layer-by-layer processes that utilize the electrostatic adsorption that occurs in a poly(diallyldimethylammonium chloride) solution. The high electrical conductivity aided by the presence of rGO significantly improved the electrochemical properties: 933 mAh g(-1) for the charge capacity (oxidation), which showed 87.5% efficiency at the first cycle with a retention of approximately 85% for 100 cycles, and 586 mAh g(-1) at 10 C-rates (10 A g(-1)) for the NiC2O4 center dot 2H(2)O/rGO electrode. The lithium storage processes were involved in the conversion reaction, which were fairly reversible via a transformation to Ni metal accompanied by the formation of a lithium oxalate compound upon discharge (reduction) and restoration to the original NiC2O4 center dot 2H(2)O upon charging (oxidation); this was confirmed via X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy and time-of-flight secondary ion mass spectroscopy. We believe that the high rate capacity and rechargeability upon cycling are the result of the unique features of the highly crystalline NiC2O4 center dot 2H(2)O nanorods assisted by conducting rGOs.
URI
https://www.nature.com/articles/am201659http://hdl.handle.net/20.500.11754/67995
ISSN
1884-4049; 1884-4057
DOI
10.1038/am.2016.59
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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