Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 33, Pages 17506-17516Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta05252a
Keywords
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Funding
- National Research Foundation of Korea Grant - Korean Government (MSIP) [NRF-2011-0030542]
- Energy Efficiency & Resources program of the Korea Institute of Energy Technology Evaluation Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20152020105770]
- Science & Engineering Research Board (SERB), a statutory body of the Department of Science & Technology, Govt. of India through Ramanujan Fellowship [SB/S2/RJN-082/2016, SB/S2/RJN-088/2016]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20152020105770] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Science & ICT (MSIT), Republic of Korea [2E27090] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0030539] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report on the synthesis of a high rate NaTi2(PO4)(3)/graphene composite for use as an anode material for high power Na-ion hybrid capacitors with the following characteristics; (1) reduction of the particle size of NaTi2(PO4)(3) to the nanometer scale in order to reduce the Na+ ion diffusion length, (2) chemical bonding between NaTi2(PO4)(3) nanoparticles and graphene in order to improve electrical conductivity, and (3) interconnected nanoporous structures in order to allow easy access of Na+ ions to NaTi2(PO4)(3). For this, the NaTi2(PO4)(3)/rGO microsphere composite was prepared via a facile spray drying method using a solution mixture of graphene oxide, NaH2PO4 center dot 2H(2)O, Ti(OC2H5)(4) and NH4H2(PO4)(3), in which all the components of the titanium were present as ionic species in order to facilitate the chemical bonding between NaTi2(PO4)(3) and rGO in the composite. The NaTi2(PO4)(3)/rGO microsphere composite had a TiO-C bond between NaTi2(PO4)(3) nanoparticles (< 80 nm) and rGO and interconnected nanoporous structures. The NaTi2(PO4)(3)/rGO microsphere composite exhibited a near theoretical specific capacity of 133 mA h g(-1) at a 0.1 C-rate and excellent rate capability (70% capacity retention at a 50 C-rate) with very stable cycling performance (only 2% capacity loss after 200 cycles at a high rate of 10C). Furthermore, the energy density and power density of the NHC assembled with a NaTi2(PO4)(3)/rGO anode and an AC-based cathode are far better than those of other NHCs assembled using other metal oxide-based anodes and AC cathodes.
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