Advanced High‐Voltage Aqueous Lithium‐Ion Battery Enabled by "Water‐in‐Bisalt" Electrolyte. Issue 25 (27th April 2016) - Suo, Liumin
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 LiMn2 O4 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. Abstract : Ready salted : A new class of electrolyte a "water‐in‐bisalt" electrolyte, that is, an electrolyte made from two salts, has a wider electrochemical stability window for aqueous lithium‐ion batteries. The unprecedented high ionic density in the solution effectively suppresses hydrogen evolution and promotes the formation of a more protective solid electrolyte interphase (SEI).