Hydrogen-Free and Dendrite-Free All-Solid-State Zn-Ion Batteries.,Advanced Materials

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Hydrogen-Free and Dendrite-Free All-Solid-State Zn-Ion Batteries.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-02-24 , DOI: 10.1002/adma.201908121
Longtao Ma ₁ , Shengmei Chen ₁ , Na Li ₁ , Zhuoxin Liu ₁ , Zijie Tang ₁ , Juan Antonio Zapien ₁ , Shimou Chen ₂ , Jun Fan ₁ , Chunyi Zhi _{1,

3}

Affiliation

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-2 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-1 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-1 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.

中文翻译：

无氢和无枝晶的全固态锌离子电池。

离子液体基锌盐电解质被证明是解决氢离子反应（HER）的副反应和锌离子电池中锌枝晶生长的有效途径。开发的电解液可在2 mA cm-2的1500 h循环（3000循环）中实现无氢，无枝晶的Zn电镀/剥离，具有几乎100％的库仑效率。同时，还有效地抑制了氧引起的腐蚀和钝化。这些特性使六价铁酸钴阴极在4 A g-1和2.05 V的高电压下，在40 000次循环中具有Zn离子电池前所未有的长寿命。此外，构造28.6μm厚的填充有聚（环氧乙烷）/离子液体基Zn盐的聚（偏二氟乙烯-六氟丙烯）膜的固体聚合物电解质，以构建全固态Zn-离子电池。全固态Zn离子电池在2 A g-1的室温下显示出3万次循环的出色循环性能，可承受高达70°C的高温，高达-20°C的低温以及滥用测试100次循环和八次切割的最大弯曲变形为150°。这是基于新型电解质的全固态Zn离子电池的首次展示，同时解决了传统Zn离子电池中深层的氢析出和枝晶生长问题。

更新日期：2020-04-08

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