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Self‐Formulated Na‐Based Dual‐Ion Battery Using Nonflammable SO 2 ‐Based Inorganic Liquid Electrolyte
Author(s) -
Kim Ayoung,
Jung Hojae,
Song Juhye,
Lee Jiwhan,
Jeong Goojin,
Kim YoungJun,
Kim Hansu
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902144
Subject(s) - electrolyte , anode , battery (electricity) , cathode , organic radical battery , materials science , electrode , energy storage , lithium (medication) , inorganic chemistry , chemical engineering , ion , nanotechnology , chemistry , power (physics) , organic chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
Sodium secondary batteries have gained much attention as alternative power sources to replace lithium secondary batteries. However, some technical issues must be solved to ensure their success. Here, a highly safe and cost‐effective Na‐based dual‐ion battery system employing self‐formulated CuCl cathode material starting from a mixture of Cu and NaCl in conjunction with a nonflammable NaAlCl 4 ·2SO 2 inorganic liquid electrolyte is demonstrated. It is found that CuCl is spontaneously formed by redox coupling of Cu/Cu(I) and SO 2 /SO 2 − anion radical. In the proposed battery, Na + and Cl − are employed as energy carriers for the anode and cathode, respectively, and it is further demonstrated that the Na‐metal‐free battery configuration is possible using a hard carbon anode. Owing to the use of cheap electrode materials and a highly conductive and safe electrolyte, the proposed batteries deserve to be regarded as a promising approach for next‐generation Na rechargeable batteries.