Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination

Satoshi Kajiyama; Lucie Szabova; Hiroki Iinuma; Akira Sugahara; Kazuma Gotoh; Keitaro Sodeyama; Yoshitaka Tateyama; Masashi Okubo; Atsuo Yamada

doi:10.1002/aenm.201601873

Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination

Satoshi Kajiyama, Lucie Szabova, Hiroki Iinuma, Akira Sugahara, Kazuma Gotoh, Keitaro Sodeyama, Yoshitaka Tateyama, Masashi Okubo, Atsuo Yamada^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

199 Citations (Scopus)

Abstract

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 Ti₂CT_x (T_x: surface termination groups) to open the interlayer space between the individual 2D Ti₂CT_x 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 Ti₂CT_x negative electrode and the LiNi_1/3Co_1/3Mn_1/3O₂ 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.

Original language	English
Journal	Advanced Energy Materials
Volume	7
Issue number	9
DOIs	https://doi.org/10.1002/aenm.201601873
Publication status	Published - 2017 May 10
Externally published	Yes

Keywords

MXene
hybrid capacitors
intercalation
negative electrode
pseudocapacitors

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Materials Science(all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/aenm.201601873

Cite this

@article{6a890bf1c6ff43b2a6901365b64d3d4b,

title = "Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination",

abstract = "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 (Tx: 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.",

keywords = "MXene, hybrid capacitors, intercalation, negative electrode, pseudocapacitors",

author = "Satoshi Kajiyama and Lucie Szabova and Hiroki Iinuma and Akira Sugahara and Kazuma Gotoh and Keitaro Sodeyama and Yoshitaka Tateyama and Masashi Okubo and Atsuo Yamada",

note = "Funding Information: This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Grant-in-Aid for Specially Promoted Research No. 15H05701. This work is also supported by MEXT, Japan under the “Elemental Strategy Initiative for Catalysts and Batteries (ESICB).” M.O. was financially supported by the Sumitomo Foundation. M.O. was also supported by JSPS KAKENHI Grant No. JP15H03873 and JP16H00901. The X-ray absorption spectroscopy was carried out under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2014G044 and 2016G031). The calculations were carried out using the supercomputers in NIMS, ISSP, and ITC of The University of Tokyo, Kyushu University as well as the K computer through the HPCI System Research Project (Project ID: hp160040, hp160075, hp160080, hp160174). Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2017",

month = may,

day = "10",

doi = "10.1002/aenm.201601873",

language = "English",

volume = "7",

journal = "Advanced Energy Materials",

issn = "1614-6832",

publisher = "Wiley-VCH Verlag",

number = "9",

}

TY - JOUR

T1 - Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination

AU - Kajiyama, Satoshi

AU - Szabova, Lucie

AU - Iinuma, Hiroki

AU - Sugahara, Akira

AU - Gotoh, Kazuma

AU - Sodeyama, Keitaro

AU - Tateyama, Yoshitaka

AU - Okubo, Masashi

AU - Yamada, Atsuo

N1 - Funding Information: This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Grant-in-Aid for Specially Promoted Research No. 15H05701. This work is also supported by MEXT, Japan under the “Elemental Strategy Initiative for Catalysts and Batteries (ESICB).” M.O. was financially supported by the Sumitomo Foundation. M.O. was also supported by JSPS KAKENHI Grant No. JP15H03873 and JP16H00901. The X-ray absorption spectroscopy was carried out under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2014G044 and 2016G031). The calculations were carried out using the supercomputers in NIMS, ISSP, and ITC of The University of Tokyo, Kyushu University as well as the K computer through the HPCI System Research Project (Project ID: hp160040, hp160075, hp160080, hp160174). Publisher Copyright: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2017/5/10

Y1 - 2017/5/10

N2 - 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 (Tx: 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.

AB - 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 (Tx: 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.

KW - MXene

KW - hybrid capacitors

KW - intercalation

KW - negative electrode

KW - pseudocapacitors

UR - http://www.scopus.com/inward/record.url?scp=85008343579&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85008343579&partnerID=8YFLogxK

U2 - 10.1002/aenm.201601873

DO - 10.1002/aenm.201601873

M3 - Article

AN - SCOPUS:85008343579

SN - 1614-6832

VL - 7

JO - Advanced Energy Materials

JF - Advanced Energy Materials

IS - 9

ER -

Enhanced Li-Ion Accessibility in MXene Titanium Carbide by Steric Chloride Termination

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this