Sulfur Copolymer: A New Cathode Structure for Room-Temperature Sodium–Sulfur Batteries,ACS Energy Letters

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Sulfur Copolymer: A New Cathode Structure for Room-Temperature Sodium–Sulfur Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-09-29 00:00:00 , DOI: 10.1021/acsenergylett.7b00714
Arnab Ghosh ₁ , Swapnil Shukla ₂ , Monisha Monisha ₂ , Ajit Kumar ₁ , Bimlesh Lochab ₂ , Sagar Mitra ₁

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High-energy electrochemical storage containing earth abundant materials could be a choice for future battery development. Recent research reports indicated the possibility of room-temperature sodium-ion–sulfur chemistry for large storage including smart grids. Here, we report a room-temperature sodium–sulfur battery cathode that will address the native downsides of a sodium–sulfur battery, such as polysulfide shuttling and low electrical conductivity of elemental sulfur. In this Letter, we use a sustainable route which ensures a large sulfur confinement (i.e., ∼90 wt %) in the cathode structure. The sulfur-embedded polymer is realized via thermal ring-opening polymerization of benzoxazine in the presence of elemental sulfur (CS90) and later composite with reduced graphene oxide (rGO). The resulting CS90 allows a homogeneous distribution of sulfur due to in situ formation of the polymer backbone and allows maximum utilization of sulfur. This unique electrode structure bestows CS90–rGO with an excellent Coulombic efficiency (99%) and healthy cycle life.

中文翻译：

硫共聚物：一种用于室温钠硫电池的新型阴极结构

含有丰富地球物质的高能电化学存储可能是未来电池开发的一种选择。最近的研究报告表明，室温下钠离子-硫化学物质可用于包括智能电网在内的大型存储。在这里，我们报告了一个室温钠硫电池阴极，该阴极将解决钠硫电池的固有缺点，例如多硫化物穿梭和元素硫的低电导率。在这封信中，我们使用了可持续的途径，以确保在阴极结构中有较大的硫含量（约90 wt％）。通过在元素硫（CS90）存在下苯并恶嗪的热开环聚合以及随后与还原的氧化石墨烯（rGO）的复合物来实现嵌入硫的聚合物。由于原位形成聚合物主链，所得的CS90可以使硫均匀分布，并可以最大程度地利用硫。这种独特的电极结构使CS90–rGO具有出色的库仑效率（99％）和健康的循环寿命。

更新日期：2017-09-29

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