Author/Authors :
Takeuchi، نويسنده , , Tomonari and Kageyama، نويسنده , , Hiroyuki and Nakanishi، نويسنده , , Koji and Ohta، نويسنده , , Toshiaki and Sakuda، نويسنده , , Atsushi and Sakai، نويسنده , , Tetsuo and Kobayashi، نويسنده , , Hironori and Sakaebe، نويسنده , , Hikari and Tatsumi، نويسنده , , Kuniaki and Ogumi، نويسنده , , Zempachi، نويسنده ,
Abstract :
Graphite–solid electrolyte (SE) composite anode, prepared by spark-plasma-sintering (SPS) process, was applied to all-solid-state lithium secondary batteries with lithium sulfide (Li2S) positive electrode. The electrochemical tests demonstrated that the graphite–SE/Li2S cells showed the discharge capacity of ca. 750 mAh·g− 1-Li2S with the average voltage of ca. 1.98 V. Although the discharge capacity was lower than that of the In/Li2S cells (ca. 920 mAh·g− 1-Li2S), the estimated energy density was higher than that (ca. 1490 and 1220 mWh·g− 1-Li2S for graphite–SE/Li2S and In/Li2S cells, respectively), due mainly to its higher average voltage. The graphite–SE/Li2S cells showed improved rate capability as compared with the cells with the graphite + SE blended powder, which was attributable mainly to the reduced interfacial resistance between the graphite and SE particles caused by the SPS process.
Keywords :
All-solid-state battery , Lithium sulfide cathode , Spark-plasma-sintering , Graphite–solid electrolyte composite anode
