A Novel Sulfur‐Based Terpolymer Cathode Material for Lithium–Sulfur Battery,Energy Technology

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A Novel Sulfur‐Based Terpolymer Cathode Material for Lithium–Sulfur Battery
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-16 , DOI: 10.1002/ente.202000057
Jing Wang ₁ , Shichao Zhang ₂

Affiliation

Herein, the preparation and characterization of a novel sulfur‐based terpolymer via inverse vulcanization and dynamic covalent polymerizations using the raw materials of elemental sulfur, styrene, and peanut oil are reported. The sulfur content of this terpolymer is about 72 wt%. As it is viscous but flowable at room temperature, it can be mixed with conductive graphene without binders. Poly(sulfur–styrene–peanut oil) (poly(S–Sty–P)) terpolymer is further successfully utilized as the active cathode material in Li–S batteries. The initial specific capacity of this kind of battery reaches 1008 mAh g⁻¹. After 100 cycles, the specific capacity keeps at 611 mAh g⁻¹ with the capacity retention rate above 60% and coulombic efficiency close to 100%. Compared with the traditional sulfur cathode material, this terpolymer cathode material exhibits higher capacity, better cycle performance, and superior high‐rate performance. In addition, it can be directly coated on the aluminum foil collector without additional binders, which reduces the internal resistance effect from additional binders and simplifies the battery assembly process.

中文翻译：

一种用于锂硫电池的新型硫基三元共聚物阴极材料

本文报道了使用元素硫，苯乙烯和花生油的原料通过逆硫化和动态共价聚合制备和表征新型硫基三元共聚物的方法。该三元共聚物的硫含量为约72重量％。由于它粘稠，但在室温下可流动，因此可以与不含粘合剂的导电石墨烯混合。聚（硫-苯乙烯-花生油）（聚（S-Sty-P））三元共聚物进一步成功地用作Li-S电池的活性阴极材料。这种电池的初始比容量达到1008 mAh g ^-1。100次循环后，比容量保持在611 mAh g ^-1容量保持率超过60％，库仑效率接近100％。与传统的硫阴极材料相比，这种三元共聚物阴极材料具有更高的容量，更好的循环性能和优异的高倍率性能。此外，它可以直接涂在铝箔集电器上，而无需使用其他粘合剂，从而减少了其他粘合剂的内阻效应，并简化了电池组装过程。

更新日期：2020-03-16

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