Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 37, Pages 19819-19825Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta04470d
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Funding
- Hebrew University of Jerusalem (HUJ, Israel)
- Nanyang Technological University (NTU, Singapore)
- CREATE (Campus for Research Excellence and Technological Enterprise) from the National Research Foundation of Singapore (NRF, Singapore)
- Science & Engineering Research Board (SERB), a statutory body of the Department of Science & Technology, Govt. of India through a Ramanujan Fellowship [SB/S2/RJN-088/2016]
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A remarkable improvement in energy density was found using Se-substituted two-dimensional TiS2 (TiSe0.6S1.4) as the insertion matrix in a Li-ion capacitor (LIC) assembly with activated carbon (AC) as the counter electrode. Chemical vapor transport was successfully used to synthesize high quality TiSe0.6S1.4 with near-100% crystallinity and subsequently employed as a battery component in LICs. Prior to LIC fabrication, the Li-insertion properties were assessed in single-electrode configuration with metallic Li. Single-electrode performance is crucial for adjusting the mass loading of AC and TiSe0.6S1.4 to realize the maximum energy density. Accordingly, an AC/TiSe0.6S1.4-based LIC delivered an energy density of similar to 50 W h kg(-1) with a good cyclability of 5000 cycles. Few undesirable side reactions with the electrolyte counterpart were observed for TiSe0.6S1.4, as supported by the impedance measurements.
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