Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201601873
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- MEXT, Japan under the Elemental Strategy Initiative for Catalysts and Batteries (ESICB)
- Sumitomo Foundation
- JSPS KAKENHI Grant [JP15H03873, JP16H00901]
- HPCI System Research Project [hp160040, hp160075, hp160080, hp160174]
- [15H05701]
- Grants-in-Aid for Scientific Research [15H03873, 16H00901, 26870385, 15H05701] Funding Source: KAKEN
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Pseudocapacitance is a key charge storage mechanism to advanced electrochemical energy storage devices distinguished by the simultaneous achievement of high capacitance and a high charge/discharge rate by using surface redox chemistries. MXene, a family of layered compounds, is a pseudocapacitor-like electrode material which exhibits charge storage through exceptionally fast ion accessibility to redox sites. Here, the authors demonstrate steric chloride termination in MXene Ti2CTx (T-x: surface termination groups) to open the interlayer space between the individual 2D Ti2CTx units. The open interlayer space significantly enhances Li-ion accessibility, leading to high gravimetric and volumetric capacitances (300 F g(-1) and 130 F cm(-3)) with less diffusion limitation. A Li-ion hybrid capacitor consisting of the Ti2CTx negative electrode and the LiNi1/3Co1/3Mn1/3O2 positive electrode displays an unprecedented specific energy density of 160 W h kg(-1) at 220 W kg(-1) based on the total weight of positive and negative active materials.
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