Batteries, Vol. 8, Pages 1: Symmetric Aqueous Batteries of Titanium Hexacyanoferrate in Na+, K+, and Mg2+ Media
Batteries doi: 10. 3390/batteries8010001
Authors: Min Li Alessandro Bina Mariam Maisuradze Marco Giorgetti
Symmetric batteries, in which the particular same active material is used for the optimistic and the negative electrode, simplifying the manufacture procedure and reducing the manufacture cost, have attracted extensive interest for large-scale stationary energy storage. In this particular paper, we propose the symmetric battery based on titanium hexacyanoferrate (TiHCF) with two well-separated redox highs of Fe3+/Fe2+ and Ti4+/Ti3+ and tested it in aqueous Na-ion/ K-ion/Mg-ion electrolytes. The result shows that all the symmetric batteries exhibit a voltage plateau based at around 0. 6 V, with discharge capability around 30 mAhg& amplifying device; minus; 1 at C/5. Compared to a Mg-ion electrolyte, the TiHCF symmetric batteries in Na-ion and K-ion electrolytes have better stability. The calculated diffusion coefficient of Na+, K+, and Mg2+ are in the same order of degree, which indicates the three-dimensional ionic channels and interstices in the lattice of TiHCF are large enough for an efficient Na+, K+ and Mg2+ insertion and extraction.