Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 25, Pages 7136-7141Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201602397
Keywords
anatase TiO2; aqueous batteries; electrolyte; lithium-ion batteries; water-in-bisalt
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Funding
- DOE ARPA-E [DEAR0000389]
- Maryland Nano Center
- Nisp Lab
- SAC Lab
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A new super-concentrated aqueous electrolyte is proposed by introducing a second lithium salt. The resultant ultra-high concentration of 28 m led to more effective formation of a protective interphase on the anode along with further suppression of water activities at both anode and cathode surfaces. The improved electrochemical stability allows the use of TiO2 as the anode material, and a 2.5 Vaqueous Li-ion cell based on LiMn2O4 and carbon-coated TiO2 delivered the unprecedented energy density of 100 Wh kg(-1) for rechargeable aqueous Li-ion cells, along with excellent cycling stability and high coulombic efficiency. It has been demonstrated that the introduction of a second salts into the water-in-salt electrolyte further pushed the energy densities of aqueous Li-ion cells closer to those of the state-of-the-art Li-ion batteries.
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