TY - JOUR
T1 - Amorphous Metal Polysulfides
T2 - Electrode Materials with Unique Insertion/Extraction Reactions
AU - Sakuda, Atsushi
AU - Ohara, Koji
AU - Fukuda, Katsutoshi
AU - Nakanishi, Koji
AU - Kawaguchi, Tomoya
AU - Arai, Hajime
AU - Uchimoto, Yoshiharu
AU - Ohta, Toshiaki
AU - Matsubara, Eiichiro
AU - Ogumi, Zempachi
AU - Okumura, Toyoki
AU - Kobayashi, Hironori
AU - Kageyama, Hiroyuki
AU - Shikano, Masahiro
AU - Sakaebe, Hikari
AU - Takeuchi, Tomonari
N1 - Funding Information:
This work was supported by the RISING and RISINGII projects of the New Energy and Industrial Technology Development Organization (NEDO), Japan.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/7/5
Y1 - 2017/7/5
N2 - A unique charge/discharge mechanism of amorphous TiS4 is reported. Amorphous transition metal polysulfide electrodes exhibit anomalous charge/discharge performance and should have a unique charge/discharge mechanism: neither the typical intercalation/deintercalation mechanism nor the conversion-type one, but a mixture of the two. Analyzing the mechanism of such electrodes has been a challenge because fewer tools are available to examine the "amorphous" structure. It is revealed that the electrode undergoes two distinct structural changes: (i) the deformation and formation of S-S disulfide bonds and (ii) changes in the coordination number of titanium. These structural changes proceed continuously and concertedly for Li insertion/extraction. The results of this study provide a novel and unique model of amorphous electrode materials with significantly larger capacities.
AB - A unique charge/discharge mechanism of amorphous TiS4 is reported. Amorphous transition metal polysulfide electrodes exhibit anomalous charge/discharge performance and should have a unique charge/discharge mechanism: neither the typical intercalation/deintercalation mechanism nor the conversion-type one, but a mixture of the two. Analyzing the mechanism of such electrodes has been a challenge because fewer tools are available to examine the "amorphous" structure. It is revealed that the electrode undergoes two distinct structural changes: (i) the deformation and formation of S-S disulfide bonds and (ii) changes in the coordination number of titanium. These structural changes proceed continuously and concertedly for Li insertion/extraction. The results of this study provide a novel and unique model of amorphous electrode materials with significantly larger capacities.
UR - http://www.scopus.com/inward/record.url?scp=85021997410&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85021997410&partnerID=8YFLogxK
U2 - 10.1021/jacs.7b03909
DO - 10.1021/jacs.7b03909
M3 - Article
C2 - 28618780
AN - SCOPUS:85021997410
VL - 139
SP - 8796
EP - 8799
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 26
ER -