Aqueous Batteries Operated at-50 °C
Aqueous Batteries Operated at-50 °C
复制标题
水性电池在零下 50 摄氏度下运行
DOI：
10.1002/anie.201908913
复制
发表时间：
2019-10-15
影响因子：
16.6
通讯作者：
Chen, Jun
中科院分区：
文献类型：
--
作者：
Nian, Qingshun;Wang, Jiayue;Chen, Jun
离子电导率不足和电解质冻结被认为是低温下电化学储能的主要问题。本文将二甲基亚砜（DMSO）作为摩尔分数为0.3的添加剂，加入到2 m氯化钠（2M-0.3电解质）的水溶液中，制备出冰点低于-130℃的电解质。在-50℃下，2M-0.3电解质表现出0.11 mS cm（-1）的离子电导率。光谱研究和分子动力学（MD）模拟相结合表明，DMSO与水分子之间形成了稳定的氢键，有利于电解质在超低温度下的运行。该研究为开发低温度的碱离子电池提供了一种简单有效的方法。
Insufficient ionic conductivity and freezing of the electrolyte are considered the main problems for electrochemical energy storage at low temperatures (low T). Here, an electrolyte with a freezing point lower than -130 degrees C is developed by using dimethyl sulfoxide (DMSO) as an additive with molar fraction of 0.3 to an aqueous solution of 2 m NaClO4 (2M-0.3 electrolyte). The 2M-0.3 electrolyte exhibits sufficient ionic conductivity of 0.11 mS cm(-1) at -50 degrees C. The combination of spectroscopic investigations and molecular dynamics (MD) simulations reveal that hydrogen bonds are stably formed between DMSO and water molecules, facilitating the operation of the electrolyte at ultra-low T. Using DMSO as the electrolyte additive, the aqueous rechargeable alkali-ion batteries (AABs) can work well even at -50 degrees C. This work provides a simple and effective strategy to develop low T AABs.