Rationally Designed High-Sulfur-Content Polymeric Cathode Material for Lithium–Sulfur Batteries,ACS Applied Materials & Interfaces

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Rationally Designed High-Sulfur-Content Polymeric Cathode Material for Lithium–Sulfur Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-01-16 00:00:00 , DOI: 10.1021/acsami.8b21395
Amruth Bhargav ₁ , Chi-Hao Chang ₁ , Yongzhu Fu ₂ , Arumugam Manthiram ₁

Affiliation

Polyethylene hexasulfide (PEHS) is investigated as a cathode material in lithium batteries. By utilizing a condensation reaction, ethylene groups are inserted between six linear sulfurs in a chain to obtain PEHS while simultaneously exercising control over the polysulfur chain length. Additionally, by selecting a low-molecular-weight organic group, PEHS contains 87 wt % sulfur, thus maximizing the material-level specific capacity to 1217 mA h g^–1. Furthermore, this synthesis method is validated using a host of materials characterization techniques. In a battery, PEHS prevents the formation of soluble long-chain intermediates that plague traditional sulfur cathodes. This enables a high material-level capacity of 774 mA h g^–1 at 1C-rate alongside a stable performance over 350 cycles with a capacity fade rate of only 0.083% per cycle. We also elucidate the unique reaction pathway of our short-chain polysulfur material and provide a useful foundation for further development of sulfur-containing polymer-based cathode materials.

中文翻译：

合理设计用于锂硫电池的高硫含量聚合物正极材料

研究了聚乙烯六硫化物（PEHS）作为锂电池中的正极材料。通过利用缩合反应，在链中的六个线性硫之间插入亚乙基以获得PEHS，同时控制多硫链的长度。另外，通过选择低分子量有机基团，PEHS包含87 wt％的硫，从而使材料级比容量最大，达到1217 mA hg ^–1。此外，使用多种材料表征技术对这种合成方法进行了验证。在电池中，PEHS可防止形成困扰传统硫阴极的可溶性长链中间体。这样可以实现774 mA hg ^–1的高物位容量以1C的速率运行时，可在350个周期内保持稳定的性能，而每个周期的容量衰减率仅为0.083％。我们还阐明了短链多硫材料的独特反应途径，并为进一步开发含硫聚合物基阴极材料提供了有用的基础。

更新日期：2019-01-16

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