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Advanced High‐Voltage Aqueous Lithium‐Ion Battery Enabled by “Water‐in‐Bisalt” Electrolyte |
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| Authors: | Dr Liumin Suo Dr Oleg Borodin Wei Sun Dr Xiulin Fan Dr Chongyin Yang Dr Fei Wang Tao Gao Dr Zhaohui Ma Dr Marshall Schroeder Dr Arthur von?Cresce Dr Selena M Russell Prof Michel Armand Prof Austen Angell Dr Kang Xu Prof Chunsheng Wang |
| Affiliation: | 1. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, USA;2. Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division U.S. Army Research Laboratory, Adelphi, MD, USA;3. IC energigune, Alava Technology Park, Albert Einstein, CMI?ANO álava, Spain;4. School of Molecular Sciences, Arizona State University, Temp, AZ, USA |
| Abstract: | 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 V aqueous 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. |
| Keywords: | anatase TiO2 aqueous batteries electrolyte lithium-ion batteries water-in-bisalt |
