Preparation of electrochemically active lithium sulfide–carbon composites using spark-plasma-sintering process

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• 作者：Tomonari Takeuchi ; Hikari Sakaebe ; Hiroyuki Kageyama ; Hiroshi Senoh ; Tetsuo Sakai ; Kuniaki Tatsumi
• 关键词：Lithium sulfide ; Carbon composite ; Positive electrode ; Lithium-ion battery ; Spark-plasma-sintering process
• 刊名：Journal of Power Sources
• 出版年：2010
• 出版时间：1 May 2010
• 年：2010
• 卷：195
• 期：9
• 页码：2928-2934
• 全文大小：1283 K

文摘

Electrochemically active lithium sulfide–carbon (Li₂S–C) composite positive electrodes, applicable for rechargeable lithium-ion batteries, were prepared using spark-plasma-sintering (SPS) process. The electrochemical tests demonstrated that the SPS-treated Li₂S–C composites showed the initial charge and discharge capacities of ca. 1200 and 200 mAh g⁻¹, respectively, though Li₂S has been reported to show no significant charge capacities when conventionally mixed with carbon powder. Such activation of Li₂S was attributed principally to strong bindings between Li₂S and carbon powders, formed by the SPS treatment. The ex situ XRD measurements showed that some amounts of Li₂S were still remained unchanged and any elemental sulfur was not detected even at fully charged state, which was similar to Li/S cells.