writer：Tao Zhu , Dongli Chen , Guoqing Liu , Peng Qi , Xiaoyu Gu , Hongfei Li , Jun Sun , Sheng Zhang
keywords：可溶性磷腈的简便固定化策略实现稳定安全的锂硫电池
source：期刊
Issue time：2022年

  Lithium–sulfur batteries (LSBs) have attracted extensive attention owing to their high energy density and abundant sulfur resources. However, LSBs are still restricted by the unsatisfactory electrochemical performance resulting from the shuttle effect of lithium polysulfide (LiPSs), and the potential fire hazard caused by inflammable ether electrolytes and polyolefin separators. Herein, a facile immobilization strategy for hexachlorocyclotriphosphazene (HCCP) is creatively applied to address the above issues simultaneously. Insoluble HCCP cross-linked microspheres (H-CMP) are firstly obtained at ambient temperature using tannic acid (TA) as a cross-linking agent and then a multifunctional separator coating is constructed based on H-CMP. The released phosphorus-related radicals from H-CMP in wide temperatures effectively prevent the combustion of electrolytes and separators, and hence improve the fire safety of the Li–S pouch cell. Furthermore, H-CMP availably chemisorbs LiPSs to interdict the shuttle effect, thereby dramatically improving the electrochemical performance of LSBs. The effectiveness of this strategy is also verified in high sulfur loading (6.38 mg cm-2), high temperature (50 °C), and Li–S pouch cells. More importantly, H-CMP exhibits sufficient stability for Li metal and suppression of Li dendrites. This facile immobilization strategy for multifunctional phosphazenes provides a competitive option for the large-scale fabrication of high-safety and high-performance LSBs.

  锂硫电池（LSBs）因其高能量密度和丰富的硫资源而受到广泛关注。然而，LSBs仍然受到多硫化锂（LiPSs）的穿梭效应导致的不理想的电化学性能以及易燃的醚电解质和聚烯烃隔膜引起的潜在火灾隐患的限制。在此，一种简便的六氯环三磷腈（HCCP）固定化策略被创造性地应用于同时解决上述问题。首先以单宁酸（TA）为交联剂，在常温下获得不溶性HCCP交联微球（H-CMP），然后构建基于H-CMP的多功能隔膜涂层。H-CMP在宽温度下释放的磷相关自由基有效地防止了电解质和隔膜的燃烧，从而提高了Li-S软包电池的防火安全性。此外，H-CMP 有效地化学吸附 LiPS 以阻止穿梭效应，从而显着提高 LSB 的电化学性能。该策略的有效性也在高硫负载（6.38 mg cm-2 )、高温 (50 °C) 和 Li-S 软包电池。更重要的是，H-CMP对锂金属表现出足够的稳定性和抑制锂枝晶。这种用于多功能磷腈的简便固定策略为大规模制造高安全性和高性能 LSB 提供了竞争选择。