4 years ago

Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion/Extraction Reactions

Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion/Extraction Reactions
Hironori Kobayashi, Toyoki Okumura, Yoshiharu Uchimoto, Hajime Arai, Katsutoshi Fukuda, Masahiro Shikano, Hiroyuki Kageyama, Zempachi Ogumi, Eiichiro Matsubara, Toshiaki Ohta, Tomoya Kawaguchi, Koji Nakanishi, Tomonari Takeuchi, Atsushi Sakuda, Koji Ohara, Hikari Sakaebe
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.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b03909

DOI: 10.1021/jacs.7b03909

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