P(VDF-HFP)-poly(sulfur-1,3-diisopropenylbenzene) functional polymer electrolyte for lithium–sulfur batteries

• 作者: Jiang-Hui Jiang An-Bang Wang Wei-Kun Wang Zhao-Qing Jin Li-Zhen Fan
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（7）
• 页码范围: 114-122
• 页数: 9页
• 语种: 英文

摘要

Lithium–sulfur (Li–S) battery as a high-energy density electrochemical energy storage system has at-tracted many researchers' attention. However, the shuttle effect of Li–S batteries and the challenges associated with lithium metal anode caused poor cycle performance. In this work, the organosulfide poly(sulfur-1,3-diisopropenylbenzene) (PSD) was prepared as cathode material and additive of P(VDF-HFP) polymer electrolyte (P(VDF-HFP)). It was verified that P(VDF-HFP) polymer electrolyte with 10％PSD (P(VDF-HFP)-10％PSD) showed a higher ionic conductivities than that of liquid electrolyte up to 2.27 × 10- 3 S cm- 1 at room temperature. The quasi-solid-state Li- S batteries fabricated with organosul-fide cathode material PSD and P(VDF-HFP) based functional polymer electrolyte delivered good cycling stability (780 mAh g- 1 after 200th cycle at 0.1 C) and rate performance (613 mAh g- 1 at 1 C). The good cycling performance could be attributed to the synergistic effect of components, including the in-teraction between polysulfides and polymer main chain in the organosulfide cathode, the sustained or-ganic/inorganic hybrid stable SEI layer formed by polymer electrolyte additive PSD, the improved cath-ode/electrolyte interface and the good affinity between P(VDF-HFP) based functional polymer electrolyte and Li metal surface. This strategy herein may provide a new route to fabricate high-performance Li–S batteries through the organosulfide cathode and functional polymer electrolyte.