Unravelling rechargeable zinc-copper batteries by a chloride shuttle in a biphasic electrolyte

Chen Xu, Chengjun Lei, Jinye Li, Xin He, Pengjie Jiang, Huijian Wang, Tingting Liu and Xiao Liang ()
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Chen Xu: Hunan University
Chengjun Lei: Hunan University
Jinye Li: Hunan University
Xin He: Hunan University
Pengjie Jiang: Hunan University
Huijian Wang: Hunan University
Tingting Liu: Hunan University
Xiao Liang: Hunan University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The zinc-copper redox couple exhibits several merits, which motivated us to reconstruct the rechargeable Daniell cell by combining chloride shuttle chemistry in a zinc chloride-based aqueous/organic biphasic electrolyte. An ion-selective interface was established to restrict the copper ions in the aqueous phase while ensuring chloride transfer. We demonstrated that the copper-water-chloro solvation complexes are the descriptors, which are predominant in aqueous solutions with optimized concentrations of zinc chloride; thus, copper crossover is prevented. Without this prevention, the copper ions are mostly in the hydration state and exhibit high spontaneity to be solvated in the organic phase. The zinc-copper cell delivers a highly reversible capacity of 395 mAh g−1 with nearly 100% coulombic efficiency, affording a high energy density of 380 Wh kg−1 based on the copper chloride mass. The proposed battery chemistry is expandable to other metal chlorides, which widens the cathode materials available for aqueous chloride ion batteries.

Date: 2023
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DOI: 10.1038/s41467-023-37642-2

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