Modified graphite and graphene electrodes for high-performance lithium ion hybrid capacitors
Lithium ion capacitors (LICs) have recently received considerable attention as a new class of energy storage system because they possess the combined advantages of lithium ion batteries and supercapacitors. LICs typically consist of activated carbon cathodes and pre-lithiated graphite anodes. Despite the promising electrochemical performance, most LICs still hold room for further improvement in terms of power density, which is largely related to the limited (de)intercalation kinetics of graphite. In an attempt to address these limited kinetics, we have developed a simple treatment to modify the morphology and surface characteristics of graphite engaging hydrogen peroxide. The treatment increases the exposed edge planes and generates more stable solid-electrolyte-interphase layers, which facilitate substantially improved power and cycling performance of the graphite anodes. Especially when integrated with a urea-reduced graphene cathode, the modified graphite-based LIC exhibits significantly higher energy and power densities compared to those of the pristine graphite-based and other reported counterparts.
- Modified graphite and graphene electrodes for high-performance lithium ion hybrid capacitors
- Open Access
- Available under Open Access This content is freely available online to anyone, anywhere at any time.
Materials for Renewable and Sustainable Energy
- Online Date
- January 2014
- Print ISSN
- Online ISSN
- Springer Berlin Heidelberg
- Additional Links
- Lithium ion capacitor
- Hybrid capacitor
- Author Affiliations
- 1. Graduate School of EEWS (Energy, Environment, Water, and Sustainability) and Center for Nature-inspired Technology (CNiT), KAIST Institute NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehakro, Yuseong-gu, Daejeon, 305-701, Republic of Korea