A pyrolyzed polyacrylonitrile/selenium disulfide composite cathode with remarkable lithium and sodium storage performances

作者：Li, Zhen; Zhang, Jintao; Lu, Yan; Lou, Xiong Wen^*

来源：Science Advances, 2018, 4(6): eaat1687.

DOI：10.1126/sciadv.aat1687

• LI-S BATTERIES
• SULFUR BATTERIES
• ROOM-TEMPERATURE
• CYCLING STABILITY
• SUPERIOR PERFORMANCE
• LIQUID ELECTROLYTE
• SELENIUM BATTERIES
• ENERGY-STORAGE
• CARBON
• ELECTROCHEMISTRY

As a special class of cathode materials for lithium-sulfur batteries, pyrolyzed polyacrylonitrile/sulfur (pPAN/S) can completely solve the polysulfide dissolution problem and deliver reliable performance. However, the applicable S contents of pPAN/S are usually lower than 50 weight % (wt %), and their capacity utilizations are not sufficient, both of which greatly limit their energy densities for commercial applications. We report a pyrolyzed polyacrylonitrile/selenium disulfide (pPAN/SeS2) composite with dramatically enhanced active material content (63 wt %) and superior performances for both lithium and sodium storage. As a result, pPAN/SeS2 delivers high capacity of >1100 mAh g(-1) at 0.2 A g(-1) for Li storage with extremely stable cycle life over 2000 cycles at 4.0 A g(-1). Moreover, when applied in a room temperature Na-SeS2 battery, pPAN/SeS2 achieves superior capacity of >900 mAh g(-1) at 0.1 A g(-1) and delivers prolonged cycle life over 400 cycles at 1.0 A g(-1).

• 出版日期2018-6
• 单位南阳理工学院