All-Solid-State Lithium Secondary Battery with Li(2)S-C Composite Positive Electrode Prepared by Spark-Plasma-Sintering Process

作者：Takeuchi Tomonari^*; Kageyama Hiroyuki; Nakanishi Koji; Tabuchi Mitsuharu; Sakaebe Hikari; Ohta Toshiaki; Senoh Hiroshi; Sakai Tetsuo; Tatsumi Kuniaki

来源：Journal of the Electrochemical Society, 2010, 157(11): A1196-A1201.

DOI：10.1149/1.3486083

Electrochemically active lithium sulfide-carbon (Li(2)S-C) composite positive electrodes, prepared by the spark plasma sintering process, were applied to all-solid-state lithium secondary batteries with a Li(3)PO(4)-Li(2)S-SiS(2) glass electrolyte. The electrochemical tests demonstrated that In/Li(2)S-C cells showed the initial charge and discharge capacities of ca. 1010 and 920 mAh g(-1)-Li(2)S, respectively, which showed higher discharge capacity and coulombic efficiency (ca. 91%) than the Li/Li(2)S-C cells with nonaqueous liquid electrolytes (ca. 200-380 mAh g(-1)-Li(2)S and ca. 27%, respectively). The ex situ S K-edge X-ray absorption fine structure measurements suggested the appearance and disappearance of elemental sulfur in the positive electrodes after charging and discharging, respectively, indicating that the ideal electrochemical reaction Li(2)S double left right arrow 2Li + S proceeded in the present all-solid-state cells. Such ideal electrochemical reaction, due probably to the suppression of the dissolution of Li(2)S in the form of polysulfides into the electrolytes, would result in higher coulombic efficiency and discharge capacity as compared with those of the liquid-electrolyte cells.

• 出版日期2010