A high-performance Cu-Al dual-ion battery realized by high-concentration Cl- electrolyte and CuS cathode

Meina Tan; Yang Qin; Yiping Wang; Fazhi Zhang; Xiaodong Lei

doi:10.1038/s41598-022-23494-1

A high-performance Cu-Al dual-ion battery realized by high-concentration Cl^- electrolyte and CuS cathode

Sci Rep. 2022 Nov 4;12(1):18714. doi: 10.1038/s41598-022-23494-1.

Authors

Meina Tan^#¹, Yang Qin^#^{1

2}, Yiping Wang³, Fazhi Zhang¹, Xiaodong Lei⁴

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
² Advanced Technology Department, RiseSun MGL, Inc., Beijing, 102299, China.
³ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. wangyiping@buct.edu.cn.
⁴ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. leixd@mail.buct.edu.cn.

^# Contributed equally.

Abstract

We propose a new Cu-Al dual-ion battery that aqueous solution composed of LiCl, CuCl and AlCl₃ (LiCuAl) is used as the electrolyte, CuS is used as the cathode of aqueous aluminum ion battery for the first time and copper foil is used as the anode. The assembled Cu-Al dual-ion battery yields a reversible capacity of 538 mA h/g at 200 mA/g, and exhibits longterm cycling stability of over 200 cycles with 88.6% capacity retention at 1000 mA/g. Above excellent performance is inseparable from the three components of LiCuAl electrolyte and electrode materials. The Al-storage mechanism of CuS is proposed that the S-S bond in CuS lattice interacts with aluminum ions during the aluminum storage process. In addition, the charging and discharging process does not cause irreversible damage to the S-S bond, thus Cu-Al dual-ion battery with CuS as cathode shows great cycle stability.

Abstract

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