Titanium Disulfide Coated Carbon Nanotube Hybrid Electrodes Enable High Energy Density Symmetric Pseudocapacitors
- Berkeley Sensor and Actuator Center, Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- San Francisco State Univ., San Francisco, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- U.S. Army RDECOM AMRDEC, Redstone Arsenal, AL (United States)
Abstract While electrochemical supercapacitors often show high power density and long operation lifetimes, they are plagued by limited energy density. Pseudocapacitive materials, in contrast, operate by fast surface redox reactions and are shown to enhance energy storage of supercapacitors. Furthermore, several reported systems exhibit high capacitance but restricted electrochemical voltage windows, usually no more than 1 V in aqueous electrolytes. Here, it is demonstrated that vertically aligned carbon nanotubes (VACNTs) with uniformly coated, pseudocapacitive titanium disulfide (TiS 2 ) composite electrodes can extend the stable working range to over 3 V to achieve a high capacitance of 195 F g −1 in an Li‐rich electrolyte. A symmetric cell demonstrates an energy density of 60.9 Wh kg −1 —the highest among symmetric pseudocapacitors using metal oxides, conducting polymers, 2D transition metal carbides (MXene), and other transition metal dichalcogenides. Nanostructures prepared by an atomic layer deposition/sulfurization process facilitate ion transportation and surface reactions to result in a high power density of 1250 W kg −1 with stable operation over 10 000 cycles. A flexible solid‐state supercapacitor prepared by transferring the TiS 2 –VACNT composite film onto Kapton tape is demonstrated to power a 2.2 V light emitting diode (LED) for 1 min.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-05CH11231; DE‐AC02‐05CH11231
- OSTI ID:
- 1465431
- Alternate ID(s):
- OSTI ID: 1412611
- Journal Information:
- Advanced Materials, Vol. 30, Issue 5; Related Information: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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