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Advanced High‐Voltage Aqueous Lithium‐Ion Battery Enabled by “Water‐in‐Bisalt” Electrolyte
Author(s) -
Suo Liumin,
Borodin Oleg,
Sun Wei,
Fan Xiulin,
Yang Chongyin,
Wang Fei,
Gao Tao,
Ma Zhaohui,
Schroeder Marshall,
von Cresce Arthur,
Russell Selena M.,
Armand Michel,
Angell Austen,
Xu Kang,
Wang Chunsheng
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201602397
Subject(s) - anode , electrolyte , faraday efficiency , aqueous solution , electrochemistry , lithium (medication) , cathode , battery (electricity) , inorganic chemistry , ion , salt (chemistry) , chemical engineering , materials science , chemistry , electrode , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
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 TiO 2 as the anode material, and a 2.5 V aqueous Li‐ion cell based on LiMn 2 O 4 and carbon‐coated TiO 2 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.