Development of Safe and Sustainable Dual‐Ion Batteries Through Hybrid Aqueous/Nonaqueous Electrolytes. Issue 8 (15th January 2020)

• Record Type: Journal Article
• Authors: Wrogemann, Jens Matthies; Künne, Sven; Heckmann, Andreas; Rodríguez‐Pérez, Ismael A.; Siozios, Vassilios; Yan, Bo; Li, Jie; Winter, Martin; Beltrop, Kolja; Placke, Tobias
• Is Part Of: Advanced energy materials. Volume 10:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-15
• Subjects: anion intercalation -- aqueous batteries -- dual‐ion batteries -- graphite intercalation compounds -- hybrid aqueous/nonaqueous electrolytes; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201902709
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: In this study, a new dual‐ion battery (DIB) concept based on an aqueous/non‐aqueous electrolyte is reported, combining high safety in the form of a nonflammable water‐in‐salt electrolyte, a high cathodic stability by forming a protective interphase on the negative electrode (non‐aqueous solvent), and improved sustainability by using a graphite‐based positive electrode material. Far beyond the anodic stability limit of water, the formation of a stage‐2 acceptor‐type graphite intercalation compound (GIC) of bis(trifluoromethanesulfonyl) imide (TFSI) anions from an aqueous‐based electrolyte is achieved for the first time, as confirmed by ex‐situ X‐ray diffraction. The choice of negative electrode material shows a huge impact on the performance of the DIB cell chemistry, i.e., discharge capacities up to 40 mAh g −1 are achieved even at a high specific current of 200 mA g −1 . In particular, lithium titanium phosphate (LiTi2 (PO4 )3 ; LTP) and lithium titanium oxide (Li4 Ti5 O12 ; LTO) are evaluated as negative electrodes, exhibiting specific advantages for this DIB setup. In this work, a new DIB storage concept combining an environmentally friendly, transition‐metal‐free, abundant graphite positive electrode material, and a nonflammable water‐based electrolyte is established, thus paving the path toward a sustainable and safe alternative energy storage technology. Abstract : A rechargeable dual‐ion battery (DIB) based on a hybrid aqueous/nonaqueous electrolyte and a graphite positive electrode is demonstrated as a new approach for safe and sustainable energy storage. The formation of a stage‐2 bis(trifluoromethanesulfonyl) imide (TFSI) graphite intercalation compound as positive electrode from aqueous electrolytes is shown for the first time, while combined with different negative electrodes to evaluate the impact on stability.