Chen Shengmei, Peng Chao, Xue Dongfeng, Ma Longtao, Zhi Chunyi
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
Multiscale Crystal Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
Angew Chem Int Ed Engl. 2022 Nov 25;61(48):e202212767. doi: 10.1002/anie.202212767. Epub 2022 Oct 27.
Alkaline aqueous batteries such as the Zn||Ni batteries have attracted substantial interests due to their merits of high energy density, high safety and low cost. However, the freeze of aqueous electrolyte and the poor cycling stability in alkaline condition have hindered their operation in subzero conditions. Herein, we construct a stable aqueous electrolyte with lowest freezing point down to -90 °C by adding dimethyl sulfoxide (DMSO) as alkaline tolerant antifreezing additive into 1 M KOH solution. Meanwhile, we find the DMSO can also retard Zn anode corrosion and prevent Zn dendrite formation in alkaline condition, which enables the Zn plating/stripping over 700 h cycle at 1 mA cm and 0.5 mAh cm . The fabricated Zn||Ni battery can endure low working temperature even down to -60 °C and its dischage capacity retains 84.1 % at -40 °C, 60.6 % at -60 °C at 0.5 C. Meanwhile, it can maintain 600 cycles with a specific capacity retention of 86.5 % at -40 °C at 2 C.
诸如锌镍电池之类的碱性水系电池因其高能量密度、高安全性和低成本的优点而引起了广泛关注。然而，水系电解质的冻结以及在碱性条件下较差的循环稳定性阻碍了它们在零下条件下的运行。在此，我们通过向1 M KOH溶液中添加作为耐碱性抗冻添加剂的二甲基亚砜（DMSO），构建了一种最低冰点低至-90°C的稳定水系电解质。同时，我们发现DMSO还可以延缓锌阳极腐蚀并防止在碱性条件下形成锌枝晶，这使得锌在1 mA cm²和0.5 mAh cm²的电流密度下能够进行超过700小时的循环电镀/剥离。所制备的锌镍电池能够承受低至-60°C的工作温度，在-40°C时其放电容量保持84.1%，在-60°C时0.5 C下保持60.6%。同时，在2 C下于-40°C时，它可以保持600次循环，比容量保持率为86.5%。
