Tan Meina, Qin Yang, Wang Yiping, Zhang Fazhi, Lei Xiaodong
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Advanced Technology Department, RiseSun MGL, Inc., Beijing, 102299, China.
Sci Rep. 2022 Nov 4;12(1):18714. doi: 10.1038/s41598-022-23494-1.
We propose a new Cu-Al dual-ion battery that aqueous solution composed of LiCl, CuCl and AlCl (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.
我们提出了一种新型的铜铝双离子电池，该电池以由LiCl、CuCl和AlCl组成的水溶液（LiCuAl）作为电解质，首次将CuS用作水系铝离子电池的阴极，铜箔用作阳极。组装好的铜铝双离子电池在200 mA/g的电流密度下可逆容量为538 mA h/g，在1000 mA/g的电流密度下表现出超过200次循环的长期循环稳定性，容量保持率为88.6%。上述优异性能与LiCuAl电解质和电极材料这三个组分密不可分。提出了CuS的储铝机制，即在储铝过程中，CuS晶格中的S-S键与铝离子相互作用。此外，充放电过程不会对S-S键造成不可逆损伤，因此以CuS为阴极的铜铝双离子电池表现出优异的循环稳定性。
