Key Laboratory of Automobile Materials Ministry of Education, and, Department of Materials Science and Engineering, Jilin University, Changchun, 130012, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Adv Mater. 2018 Jan;30(1). doi: 10.1002/adma.201703791. Epub 2017 Nov 27.
To meet the increasing demands for portable and flexible devices in a rapidly developing society, it is urgently required to develop highly safe and flexible electrochemical energy-storage systems. Flexible lithium-oxygen batteries with high theoretical specific energy density are promising candidates; however, the conventional half-open structure design prevents it from working properly under water or fire conditions. Herein, as a proof-of-concept experiment, a highly safe flexible lithium-oxygen battery achieved by the synergy of a vital multifunctional structure design and a unique composite separator is proposed and fabricated. The structure can effectively prevent the invasion of water from the environment and combustion, which is further significantly consolidated with the help of a polyimide and poly(vinylidene fluoride-co-hexafluoropropylene) composite separator, which holds good water resistance, thermal stability, and ionic conductivity. Unexpectedly, the obtained lithium-oxygen battery exhibits superior flexibility, water resistance, thermal resistance, and cycling stability (up to 218 cycles; at a high current of 1 mA and capacity of 4 mA h). This novel water/fireproof, flexible lithium-oxygen battery is a promising candidate to power underwater flexible electronics.
为了满足快速发展的社会对便携式和灵活设备不断增长的需求，迫切需要开发高度安全和灵活的电化学储能系统。具有高理论比能量密度的柔性锂-氧电池是很有前途的候选者；然而，传统的半开放式结构设计阻止了它在水下或火灾条件下正常工作。在此，作为一个概念验证实验，提出并制造了一种通过关键多功能结构设计和独特的复合分离器协同作用实现的高度安全的柔性锂-氧电池。该结构可以有效地防止环境和燃烧物中的水侵入，而聚酰亚胺和聚（偏二氟乙烯-共-六氟丙烯）复合分离器的帮助下进一步显著增强了这种效果，该分离器具有良好的耐水性、热稳定性和离子导电性。出乎意料的是，所获得的锂-氧电池表现出优异的柔韧性、耐水性、耐热性和循环稳定性（高达 218 次循环；在 1 mA 的高电流和 4 mA h 的容量下）。这种新型的防水/防火、柔性锂-氧电池是为水下柔性电子产品供电的有前途的候选者。
