Li Tao, Wang Chengdong, Cheng Junmei, Guo Jian, Xiao Ang, Hou Hongbin, Wang Qinggang, Wang Ben, Chen Xiao, Cui Guanglei
School of Environmental and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, China.
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):12857-12866. doi: 10.1021/acsami.9b23395. Epub 2020 Mar 6.
The liquid electrolytes in lithium-air (oxygen) batteries are prone to volatilize, leak, flame, and cause uneven deposition of lithium during cycling, which makes the batteries to face serious problems in terms of safety and cycling stability. A novel Janus quasi-solid composite polymer electrolyte was fabricated by perfluorosulfonic acid (Nafion) membranes with tunable thickness and poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP). The Nafion membranes not only guarantee the mechanical strength of the composites but also effectively prevent the migration of certain anions and macromolecules. The results indicate that Janus quasi-solid composite polymer electrolytes have excellent thermal stability, high lithium-ion migration number, and wide electrochemical window. Lithium-oxygen batteries using the novel quasi-solid composite electrolytes perform lower polarization and better cycling stability. The excellent properties of the quasi-solid composite electrolytes make it one of the effective materials for improving the cycling stability of lithium-air (oxygen) batteries.
锂空气（氧气）电池中的液体电解质容易挥发、泄漏、起火，并在循环过程中导致锂的不均匀沉积，这使得电池在安全性和循环稳定性方面面临严重问题。通过具有可调厚度的全氟磺酸（Nafion）膜与聚偏氟乙烯-六氟丙烯（PVDF-HFP）制备了一种新型的Janus准固态复合聚合物电解质。Nafion膜不仅保证了复合材料的机械强度，还有效地阻止了某些阴离子和大分子的迁移。结果表明，Janus准固态复合聚合物电解质具有优异的热稳定性、高锂离子迁移数和宽电化学窗口。使用新型准固态复合电解质的锂氧电池具有较低的极化和更好循环稳定性。准固态复合电解质的优异性能使其成为提高锂空气（氧气）电池循环稳定性的有效材料之一。
