Chen Chen, Hu Qilin, Yang Fan, Xue Hongyu, Zhang Yuning, Yan Hailong, Lu Yang, Luo Yongsong
Key Laboratory of Microelectronics and Energy of Henan Province, Henan Joint International Research Laboratory of New Energy Storage Technology, School of Physics and Electronic Engineering, Xinyang Normal University Xinyang 464000 P. R. China
School of Physics and Electronic Engineering, Nanyang Normal University Nanyang 473061 P. R. China.
RSC Adv. 2022 Aug 3;12(33):21558-21566. doi: 10.1039/d2ra03206f. eCollection 2022 Jul 21.
Due to the low price and abundant reserves of sodium resources, sodium-ion batteries have become the main candidate for the next generation of energy storage equipment, particularly for large-scale grid storage and low-speed electric vehicles. Transition metal selenides have attracted considerable attention because of their high reversible capacity, superior electrical conductivity and versatile structures. In this study, two-dimensional CuSe nanosheets are synthesized a simple hydrothermal reaction. When acting as an electrode material for sodium-ion batteries, the CuSe electrode exhibits an initial coulombic efficiency of 96.7% at a current density of 0.1 A g and a specific capacity of 330 mA h g after 100 operation cycles, as well as retains a specific capacity of 211 mA h g even at a high current density of 10 A g. Moreover, the anode delivers a specific capacity of 236 mA h g after 3300 cycles at 5 A g with a capacity retention of 91.2%. In sodium-ion hybrid capacitors (SHICs) with the two-dimensional CuSe nanosheets and TiCT MXene as the negative and positive materials, respectively, the nanosheets without any pre-sodiation present a lifespan of up to 2000 cycles at 2 A g and a capacity retention of about 77.7%.
由于钠资源价格低廉且储量丰富，钠离子电池已成为下一代储能设备的主要候选者，特别是用于大规模电网储能和低速电动汽车。过渡金属硒化物因其高可逆容量、优异的导电性和多样的结构而备受关注。在本研究中，通过简单的水热反应合成了二维CuSe纳米片。当用作钠离子电池的电极材料时，CuSe电极在电流密度为0.1 A g时初始库仑效率为96.7%，在100次循环操作后比容量为330 mA h g，甚至在10 A g的高电流密度下仍保持211 mA h g的比容量。此外，该阳极在5 A g下经过3300次循环后比容量为236 mA h g，容量保持率为91.2%。在分别以二维CuSe纳米片和TiCT MXene作为负极和正极材料的钠离子混合电容器（SHICs）中，未经任何预钠化处理的纳米片在2 A g下的寿命长达2000次循环，容量保持率约为77.7%。
