Wang Jiawei, Yang Yan, Wang Yingyu, Dong Shuai, Cheng Liwei, Li Yanmei, Wang Zhenya, Trabzon Levent, Wang Hua
School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
ACS Nano. 2022 Oct 25;16(10):15770-15778. doi: 10.1021/acsnano.2c04114. Epub 2022 Sep 6.
Reliable power supplies at extremely high temperatures are urgently needed to broaden the application scenarios for electric devices. Aqueous zinc metal batteries (ZMBs) with intrinsic safety are a promising alterative for high-temperature energy storage. However, the reversibility and long-term cycling stability of aqueous ZMBs at extremely high temperatures (≥100 °C) have rarely been explored. Herein, we reveal that spontaneous Zn corrosion and severe electrochemical hydrogen evolution at high temperature are vital restrictions for traditional aqueous ZMBs. To address this, a crowding agent, 1,5-pentanediol, was introduced into an aqueous electrolyte to suppress water reactivity by strengthening O-H bonds of HO and decreasing HO content in the Zn solvation sheath, while maintaining flame resistance of the electrolyte. Importantly, this electrolyte enabled reversible Zn deposition with a Coulombic efficiency of 98.1% and a long cycling life of Zn//Zn batteries for over 500 cycles (at 1 mA cm and 0.5 mAh cm) at 100 °C. Moreover, stable cycling of Zn//Te full batteries at 100 °C was demonstrated.
迫切需要在极高温度下可靠的电源，以拓宽电子设备的应用场景。具有本质安全性的水系锌金属电池（ZMBs）是高温储能的一种有前景的替代方案。然而，极少有人探索水系ZMBs在极高温度（≥100°C）下的可逆性和长期循环稳定性。在此，我们揭示了高温下自发的锌腐蚀和严重的电化学析氢是传统水系ZMBs的关键限制因素。为解决这一问题，将一种拥挤剂1,5 - 戊二醇引入水系电解质中，通过加强HO的O - H键并降低锌溶剂化鞘层中的HO含量来抑制水的反应活性，同时保持电解质的阻燃性。重要的是，这种电解质能够实现可逆的锌沉积，在100°C下，锌//锌电池的库仑效率为98.1%，循环寿命超过500次（在1 mA cm²和0.5 mAh cm²条件下）。此外，还展示了锌//碲全电池在100°C下的稳定循环。
