Journal
SOLID STATE IONICS
Volume 262, Issue -, Pages 138-142Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2013.09.046
Keywords
Graphite-solid electrolyte composite anode; Ail-solid-state battery; Lithium sulfide cathode; Spark-plasma-sintering
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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. (C) 2013 Elsevier B.V. All rights reserved.
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