Dry coating of active material particles with sulfide solid electrolytes for an all-solid-state lithium battery

JOURNAL OF POWER SOURCES

卷:448

Article

Nakamura, Hideya¹  Kawaguchi, Takashi¹  Masuyama, Tomoyuki¹  Sakuda, Atsushi²  Saito, Toshiya³  Kuratani, Kentaro⁴  Ohsaki, Shuji¹  Watano, Satoru¹ 

[1] Osaka Prefecture Univ, Dept Chem Engn, Sakai, Osaka 5998531, Japan

[2] Osaka Prefecture Univ, Dept Appl Chem, Sakai, Osaka 5998531, Japan

[3] Toyota Motor Co Ltd, Adv Mat Engn Div, Higashifuji Tech Ctr, 1200 Mishuku, Shizuoka 4101193, Japan

[4] Natl Inst Adv Ind Sci & Technol, Res Inst Electrochem Energy, Dept Energy & Environm, Ikeda, Osaka 5638577, Japan

关键词: Dry coating;    Core-shell composite particle;    3D structure;    Composite cathode;    All-solid-state battery;   

DOI  :  10.1016/j.jpowsour.2019.227579

来源: Elsevier

【 摘 要 】

In this study, we present a dry coating process to produce a core-shell composite particle for an all-solid-state lithium battery, where a single particle of the active material is coated with solid electrolytes. LiNi1/3 Co1/3Mn1/3O2 (NCM) and Li3PS4 (LPS), which are typical cathode active material and sulfide solid electrolyte, were used. A dry impact-blending device was employed for the dry coating process. We demonstrated that a single particle of NCM was uniformly coated with a continuous layer of LPS by the dry coating process without any breakage or attrition of NCM, to produce an NCM@LPS core-shell particle. The charge-discharge cycling tests showed that the rate and cycle performances of an all-solid-state half-cell prepared with the NCM@LPS core-shell particles significantly improved. The three-dimensional internal structure of the composite cathode was subsequently analyzed using FIB-SEM with an image reconstruction technique. The results revealed that the composite cathode prepared with the NCM@LPS core-shell particles had a (i) high interfacial contact area between NCM and LPS and (ii) well-percolated ion transport pathway. In conclusion, the core-shell composite particle contributed to the structure of the composite cathode, thus resulting in improved cell performance.

【 授权许可】

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