Analysis of structural and thermal stability in the positive electrode for sulfide-based all-solid-state lithium batteries

JOURNAL OF POWER SOURCES

卷:367

Article

Tsukasaki, Hirofumi¹  Otoyama, Misae²  Mori, Yota¹  Mori, Shigeo¹  Morimoto, Hideyuki³  Hayashi, Akitoshi²  Tatsumisago, Masahiro² 

[1] Osaka Prefecture Univ, Grad Sch Engn, Dept Mat Sci, Naka Ku, 1-1,Gakuen Cho, Sakai, Osaka 5998531, Japan

[2] Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Naka Ku, 1-1,Gakuen Cho, Sakai, Osaka 5998531, Japan

[3] Gunma Univ, Grad Sch Sci & Technol, Kiryu, Gunma 3768515, Japan

关键词: All-solid-state battery;    Lithium battery;    Positive electrode;    Sulfide-based solid electrolytes;    Thermal stability;    Transmission electron microscopy;   

DOI  :  10.1016/j.jpowsour.2017.09.031

来源: Elsevier

【 摘 要 】

Sulfide-based all-solid-state batteries using a non-flammable inorganic solid electrolyte are promising candidates as a next-generation power source owing to their safety and excellent charge discharge cycle characteristics. In this study, we thus focus on the positive electrode and investigated structural stabilities of the interface between the positive electrode active material LiNi1/3Mn1/3Co1/3O2 (NMC) and the 75Li(2)S center dot 25P(2)S(5) (LPS) glass electrolyte after charge discharge cycles via transmission electron microscopy (TEM). To evaluate the thermal stability of the fabricated all-solid-state cell, in-situ TEM observations for the positive electrode during heating are conducted. As a result, structural and morphological changes are detected in the LPS glasses. Thus, exothermal reaction present in the NMC-LPS composite positive electrode after the initial charging is attributable to the crystallization of LPS glasses. On the basis of a comparison with crystallization behavior in single LPS glasses, the origin of exothermal reaction in the NMC-LPS composites is discussed. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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