Ultra-low-temperature aqueous batteries

Energy Storage The development of efficient electrochemical energy storage systems is of prime importance for future energy management, which will be increasingly based on renewable energy sources. Aqueous rechargeable alkali-ion batteries are particularly attractive for large-scale implementations given their environmentally friendly components and low cost. However, their low-temperature performance requires improvements, which can be achieved by optimizing the electrolyte's ionic conductivity and freezing point. Using dimethyl sulfoxide as the electrolyte additive, Nian et al. develop a new practical electrochemical system with electrolyte that freezes below −130°C. As a result, the battery operates with sufficient ionic conductivity even at −50°C. The reasons for such an ultra-low freezing point are analyzed by means of spectral characterization and molecular dynamics simulation. Angew. Chem. Int. Ed. 10.1002/anie.201908913 (2019).