All-solid-state cells with Li4Ti5O12/carbon nanotube composite electrodes prepared by infiltration with argyrodite sulfide-based solid electrolytes via liquid-phase processing

JOURNAL OF POWER SOURCES

卷:417

Article

Yubuchi, So¹  Nakamura, Wataru¹  Bibienne, Thomas²  Rousselot, Steeve²  Taylor, Lauren W.^3,4  Pasquali, Matteo^3,4  Dolle, Mickael²  Sakuda, Atsushi¹  Hayashi, Akitoshi¹  Tatsumisago, Masahiro¹ 

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

[2] Univ Montreal, Dept Chem, 2900 Blvd Edouard Montpetit, Montreal, PQ H3T 1J4, Canada

[3] Rice Univ, Dept Chem & Biomol Engn, Smalley Inst Nanosci & Technol, 6100 Main St, Houston, TX 77005 USA

[4] Rice Univ, Dept Chem, 6100 Main St, Houston, TX 77005 USA

关键词: Sulfide-based solid electrolyte;    All-solid-state battery;    Infiltration process;    Liquid-phase technique;    Argyrodite crystal;    Li4Ti5O12;   

DOI  :  10.1016/j.jpowsour.2019.01.070

来源: Elsevier

【 摘 要 】

All-solid-state cells are safe, and have high energy densities and power densities. Sulfide-based solid electrolytes (SEs) exhibit high ionic conductivities and favorable mechanical properties allowing for the facile preparation of all-solid-state cells via simple mixing and cold-pressing processes. For practical applications, it is necessary to produce SEs and all-solid-state cells more efficiently. Herein, a novel fabrication process for homogeneous composite electrodes used in all-solid-state cells was successfully demonstrated using an infiltration technique. The Li4Ti5O12 and carbon nanotube (LTO@CNT) porous electrode was infiltrated with a precursor solution containing an argyrodite Li6PS5Br SE, and the solvent was removed by drying at 150 degrees C under vacuum to prepare an infiltrated SE-LTO@CNT electrode. The process without conventional mixing formed an electrochemically active interface with a large contact area and favorable conduction pathways. The all-solid-state cell with the SELTO@CNT electrode showed an improved capacity of 163 mAh g(-1) compared to those prepared with the dry mixed electrodes at 25 degrees C, and the high capacity was maintained for 500 cycles. Moreover, the cell with the SELTO@CNT electrode showed a reversible capacity of 100 mAh g(-1) or more at 4 C-rate and 100 degrees C. Thus, the infiltration process is effective for the practical fabrication and application of all-solid-state cells.

【 授权许可】

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