Ma Longtao, Chen Shengmei, Li Na, Liu Zhuoxin, Tang Zijie, Zapien Juan Antonio, Chen Shimou, Fan Jun, Zhi Chunyi
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Adv Mater. 2020 Apr;32(14):e1908121. doi: 10.1002/adma.201908121. Epub 2020 Feb 24.
An ionic-liquid-based Zn salt electrolyte is demonstrated to be an effective route to solve both the side-reaction of the hydrogen evolution reaction (HER) and Zn-dendrite growth in Zn-ion batteries. The developed electrolyte enables hydrogen-free, dendrite-free Zn plating/stripping over 1500 h cycle (3000 cycles) at 2 mA cm with nearly 100% coulombic efficiency. Meanwhile, the oxygen-induced corrosion and passivation are also effectively suppressed. These features bring Zn-ion batteries an unprecedented long lifespan over 40 000 cycles at 4 A g and high voltage of 2.05 V with a cobalt hexacyanoferrate cathode. Furthermore, a 28.6 µm thick solid polymer electrolyte of a poly(vinylidene fluoride-hexafluoropropylene) film filled with poly(ethylene oxide)/ionic-liquid-based Zn salt is constructed to build an all-solid-state Zn-ion battery. The all-solid-state Zn-ion batteries show excellent cycling performance of 30 000 cycles at 2 A g at room temperature and withstand high temperature up to 70 °C, low temperature to -20 °C, as well as abuse test of bending deformation up to 150° for 100 cycles and eight times cutting. This is the first demonstration of an all-solid-state Zn-ion battery based on a newly developed electrolyte, which meanwhile solves the deep-seated hydrogen evolution and dendrite growth problem in traditional Zn-ion batteries.
一种基于离子液体的锌盐电解质被证明是解决锌离子电池中析氢反应（HER）副反应和锌枝晶生长问题的有效途径。所开发的电解质能够在2 mA cm²的电流密度下实现超过1500小时（3000次循环）的无氢、无枝晶锌电镀/剥离，库仑效率接近100%。同时，氧诱导的腐蚀和钝化也得到有效抑制。这些特性使锌离子电池在使用铁氰化钴阴极时，在4 A g的电流密度和2.05 V的高电压下具有超过40000次循环的前所未有的长寿命。此外，构建了一种28.6 µm厚的聚（偏二氟乙烯-六氟丙烯）膜填充聚（环氧乙烷）/离子液体基锌盐的固体聚合物电解质，以制造全固态锌离子电池。全固态锌离子电池在室温下2 A g的电流密度下表现出30000次循环的优异循环性能，并且能够承受高达70°C的高温、低至-20°C的低温，以及高达150°的弯曲变形100次和八次切割的滥用测试。这是首次展示基于新开发电解质的全固态锌离子电池，同时解决了传统锌离子电池中深层次的析氢和枝晶生长问题。
