Energy Storage

Ultra-low-temperature aqueous batteries

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Science  18 Oct 2019:
Vol. 366, Issue 6463, pp. 321-322
DOI: 10.1126/science.366.6463.321-b

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).

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