Journal
JOURNAL OF POWER SOURCES
Volume 264, Issue -, Pages 108-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.04.076
Keywords
Lithium ion capacitors; Graphene; Energy density; Power density
Funding
- NSFC [21273118]
- MOE Innovation Team in China [IRT13022]
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A Li-ion capacitor (LIC), typically composed of a pre-lithiated negative electrode and an activated-carbon positive electrode, can provide high energy and power density. In this work, we compare the electrochemical performances of pre-lithiated graphene nanosheets and conventional graphite as negative electrode materials for LICs. The LICs employing pre-lithiated graphene nanosheets show a specific capacitance of 168.5 F g(-1) with 74% capacitance retention at 400 mA g(-1) after 300 cycles. Moreover, the capacitors deliver a maximum power density of 222.2 W kg(-1) at an energy density of 61.7 Wh kg(-1) operated in the voltage range of 2.0-4.0 V. Therefore, pre-lithiated graphene nanosheets are promising negative electrode materials for high power LICs. (C) 2014 Elsevier B.V. All rights reserved.
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