School of Materials Science and Engineering, Hunan Provincial Key Lab of Advanced Materials, for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan, 411201, P. R. China.
School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.
Chemistry. 2023 May 16;29(28):e202300331. doi: 10.1002/chem.202300331. Epub 2023 Apr 3.
The aqueous metal-sulfide batteries (AMSBs) have attracted research interest due to their high capacity, environmentally friendly qualities, and the accessibility of raw materials. However, the design strategies for metal-sulfide cathode have rarely been reported. Here, the copper-activated sphalerite in which Zn is substituted by Cu through ion exchange has been introduced for the first time as cathode for aqueous Cu/ZnS batteries. After sphalerite transformed to CuS, a two-step conversion of CuS→Cu S →Cu S storage mechanism has been proposed. At 0.7 A g current density, the capacity can reach 532.4 mAh g after 100 cycles. When cycled once at a current density of 35 mA g , the initial reversible capacity can reach 461 mAh g under 1 A g . Furthermore, the assembled Zn//ZnS hybrid ion cell delivers an energy of up to 460 Wh kg , which is better than for many AMSBs.
水系金属-硫化物电池（AMSBs）因其高容量、环保特性以及原材料易得性而引起了研究兴趣。然而，金属-硫化物正极的设计策略却鲜有报道。本文首次将通过离子交换将 Zn 取代为 Cu 的铜激活闪锌矿引入作为水系 Cu/ZnS 电池的正极。闪锌矿转化为 CuS 后，提出了 CuS→CuS→CuS 的两步转化存储机制。在 0.7 A g 的电流密度下，经过 100 次循环后，容量可达到 532.4 mAh g。在 35 mA g 的电流密度下循环一次后，在 1 A g 下，初始可逆容量可达到 461 mAh g。此外，组装的 Zn//ZnS 混合离子电池的能量高达 460 Wh kg，优于许多 AMSBs。
