Tian Hao, Sun Zhihua, Ren Lulin, Jin Yanchun, Wang Dong, Wei Yumeng, Chen Hao, Liu Kun, Chen Yingying, Yang Hongxun
School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China.
School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China; Zhenjiang Runbo Electronics Technology Co., Ltd, Zhenjiang 212000, Jiangsu, China.
J Colloid Interface Sci. 2024 Mar 15;658:827-835. doi: 10.1016/j.jcis.2023.12.125. Epub 2023 Dec 22.
Transition metal selenides are promising anode candidates for sodium ion batteries (SIBs) because of their higher theoretical capacity and conductivity than metal oxides. However, the disadvantages of severe capacity degradation and poor magnification performance greatly limit their commercial applications. Herein, we have developed a new hollow bimetallic selenides (CoSe-ZnSe)@reduced graphene oxide (rGO) composite with abundant heterointerfaces. The rGO could not only alleviate the volume variations of hollow CoSe-ZnSe microspheres during cycling, but also improve the conductivity of composite. The presence of the heterointerfaces could help to accelerate ionic diffusion kinetics and improve electron transfer, resulting in the improved sodium storage performance. As an advanced anode for SIBs, the CoSe-ZnSe@rGO exhibits an enhanced initial coulombic efficiency of 75.1% (65.2% of CoSe@rGO), extraordinary rate capability, and outstanding cycling stability (540.3 mAh/g at 0.2 A/g after 150 cycles, and 395.2 mAh/g at 1 A/g after 600 cycles). The electrochemical mechanism was also studied by kinetic analysis, showing that the charging/discharging process of CoSe-ZnSe@rGO is mostly related to a capacitive-controlled behavior.
过渡金属硒化物因其理论容量和电导率高于金属氧化物，是钠离子电池（SIBs）颇具前景的负极候选材料。然而，严重的容量衰减和较差的倍率性能等缺点极大地限制了它们的商业应用。在此，我们开发了一种具有丰富异质界面的新型中空双金属硒化物（CoSe-ZnSe）@还原氧化石墨烯（rGO）复合材料。rGO不仅可以缓解中空CoSe-ZnSe微球在循环过程中的体积变化，还能提高复合材料的电导率。异质界面的存在有助于加速离子扩散动力学并改善电子转移，从而提高储钠性能。作为SIBs的先进负极，CoSe-ZnSe@rGO表现出增强的初始库仑效率，为75.1%（CoSe@rGO为65.2%），具有出色的倍率性能和卓越的循环稳定性（150次循环后在0.2 A/g下为540.3 mAh/g，600次循环后在1 A/g下为395.2 mAh/g）。还通过动力学分析研究了其电化学机理，结果表明CoSe-ZnSe@rGO的充放电过程主要与电容控制行为有关。
