Lin Hezhe, Liu Jingyi, Li Malin, Chen Nan, Xuan Wei, Liu Lina, Yao Shiyu, Du Fei
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Department of Hepatopancreaticobiliary Surgery, China-Japan Union Hospital of Jilin University, Changchun 130033, China.
ACS Appl Mater Interfaces. 2021 Dec 15;13(49):58763-58770. doi: 10.1021/acsami.1c19454. Epub 2021 Dec 1.
Transition metal sulfides have received considerable interest as the anodes for sodium-ion (SIBs) and potassium-ion batteries (PIBs) owing to their high theoretical capacity and suitable working potential. However, they suffer from poor electrochemical reversibility and limited cycle lives. Herein, we design and synthesize a Se-substituted CuS material, which demonstrates superior electrochemical properties for both potassium and sodium storage because of the enhanced electronic conductivity, lowered diffusion barrier, and shortened diffusion pathway. The anode delivers a specific capacity of 374 mA h g at a current density of 5 A g in SIBs and 341 mA h g at 2 A g in PIBs and nearly 100% capacity retention over 2000 cycles (SIBs) and 600 cycles (PIBs), respectively. Moreover, a combined measurement including X-ray diffraction, Raman, and transmission electron microscopy reveals an interesting discharge product of NaSSe, which could accelerate the conversion reaction and enhance the electrochemical reversibility.
过渡金属硫化物因其高理论容量和合适的工作电位，作为钠离子电池（SIBs）和钾离子电池（PIBs）的负极受到了广泛关注。然而，它们存在电化学可逆性差和循环寿命有限的问题。在此，我们设计并合成了一种硒取代的硫化铜材料，由于其电子导电性增强、扩散势垒降低和扩散路径缩短，该材料在钾和钠存储方面均表现出优异的电化学性能。该负极在SIBs中电流密度为5 A g时的比容量为374 mA h g，在PIBs中电流密度为2 A g时的比容量为341 mA h g，并且在2000次循环（SIBs）和600次循环（PIBs）中分别保持近100%的容量。此外，包括X射线衍射、拉曼光谱和透射电子显微镜在内的联合测量揭示了一种有趣的放电产物NaSSe，它可以加速转化反应并增强电化学可逆性。
