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conferenceseries
.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Polymer-derived nitrogen-doped carbon nanocage as an enhanced oxygen electrode in Li-O2 battery
Heejun Kweon, Katie H Lim and Hansung Kim
Yonsei University, Republic of Korea
R
ecently, Li-O
2
batteries have emerged as advantageous energy storage device, due to their extremely high theoretical energy
density compared to commercial Li-ion batteries. The oxygen electrode has been identified as a key factor influencing the
overall performance of Li-O
2
batteries. During discharging, Oxygen Reduction Reaction (ORR) occurs and insoluble discharge
product Li
2
O
2
is formed as a product on the electrode. The insoluble and insulating discharge product becomes decomposed
during charge through the reverse reaction, Oxygen Evolution Reaction (OER). As charging and discharging processes are
repeated, it is important to control the deposition and decomposition of Li
2
O
2
efficiently for improvement in Li-O
2
battery
performance in aspects of increased capacity and cycle stability. In this regard, many researches have been conducted for
promoting ORR and OER in Li-O
2
battery which is highly related to Li
2
O
2
formation and decomposition, respectively. Herein,
we present the Polydopamine (PDA)-derived nitrogen-doped graphitic Carbon Nanocage (CNC) for a bi-functional oxygen
electrode in Li-O
2
battery. Nitrogen was successfully and uniformly doped on graphitic CNC by utilizing adhesive property
of PDA which also contains high concentration of amine group itself and subsequent heat treatment. The doped nitrogen
content and heat treatment temperature were optimized in order to maximize the nitrogen doping effect. Various physical
and electrochemical characteristics were investigated as an oxygen electrode in Li-O
2
battery. As a result, the PDA-derived
nitrogen-doped CNC improved the performance of Li-O
2
batteries in terms of increased capacity, promoted rate capability
and extended cycle life.
Biography
Heejun Kweon has received her Bachelor’s degree in Environment & Energy Engineering at Gachon University. Presently, she is in combined course of Master and
PhD at Department of Chemical and Bio-molecular Engineering in Yonsei University. Her research interest is synthesis and analysis of electro-catalytic materials
for Li-air battery system.
victoryingod8@naver.comHeejun Kweon et al., J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009