Gao Lu, Sarmad Bushra, Li Jianxin, Cheng Bowen, Kang Weimin, Deng Nanping
State Key Laboratory of Separation Membranes and Membrane Processes, National Center for International Joint Research on Separation Membranes, School of Textile Science and Engineering, Tiangong University, Tianjin, 300387, PR China.
School of International Education, Tiangong University, Tianjin 300387, PR China.
J Power Sources. 2020 Nov 1;475:228663. doi: 10.1016/j.jpowsour.2020.228663. Epub 2020 Aug 23.
All-solid-state electrolytes have received extensive attention due to their excellent safety and good electrochemical performance. However, due to the harsh conditions of the preparation process, the commercial production of all-solid-state electrolytes remains a challenge. The outbreak of the novel coronavirus pneumonia (COVID-19) has caused great inconvenience to people, while also allowing soft, lightweight and mass-producible non-woven fabrics in masks come into sight. Here, a polymer/polymer solid composite electrolyte is obtained by introducing the polyamide 6 (PA6) microfiber non-woven fabric into PEO polymer through the hot-pressing method. The addition of the PA6 non-woven fabric with lithium-philic properties can not only reduce the crystallinity of the polymer, but also provide more functional transmission sites and then promote the migration of lithium ions at the molecular level. Moreover, due to the sufficient mechanical strength and flexibility of the PA6 non-woven fabric, the composite electrolyte shows excellent inhibition ability of lithium dendrite growth and high electrochemical stability. The novel design concept of introducing low-cost and large-scale production of non-woven fabrics into all-solid-state composite electrolytes to develop high-performance lithium metal batteries is attractive, and can also be broadened to the combination of different types of polymers to meet the needs of various batteries.
全固态电解质因其优异的安全性和良好的电化学性能而受到广泛关注。然而，由于制备过程条件苛刻，全固态电解质的商业化生产仍然是一个挑战。新型冠状病毒肺炎（COVID-19）疫情给人们带来了极大不便，同时也让口罩中柔软、轻便且可大规模生产的无纺布映入眼帘。在此，通过热压法将聚酰胺6（PA6）微纤维无纺布引入PEO聚合物中，制备出一种聚合物/聚合物固体复合电解质。具有亲锂特性的PA6无纺布的加入不仅可以降低聚合物的结晶度，还能提供更多的功能传输位点，进而在分子水平上促进锂离子的迁移。此外，由于PA6无纺布具有足够的机械强度和柔韧性，复合电解质表现出优异的抑制锂枝晶生长的能力和高电化学稳定性。将低成本且可大规模生产的无纺布引入全固态复合电解质以开发高性能锂金属电池的新颖设计理念具有吸引力，并且还可以扩展到不同类型聚合物的组合，以满足各种电池的需求。
