水溶液
机制(生物学)
电荷(物理)
材料科学
载流子
水介质
化学物理
纳米技术
化学
工程物理
光电子学
物理化学
物理
量子力学
作者
Shengwei Li,Xudong Zhao,Tianhao Wang,Jiae Wu,Xiaoxia Xu,Ping Li,Xiaobo Ji,Hongshuai Hou,Xuanhui Qu,Lifang Jiao,Yongchang Liu
标识
DOI:10.1002/anie.202320075
摘要
The utilization rate of active sites in cathode materials for Zn-based batteries is a key factor determining the reversible capacities. However, a long-neglected issue of the strong electrostatic repulsions among divalent Zn2+ in hosts inevitably causes the squander of some active sites (i.e., gap sites). Herein, we address this conundrum by unraveling the "gap-filling" mechanism of multiple charge carriers in aqueous Zn-MoS2 batteries. The tailored MoS2/(reduced graphene quantum dots) hybrid features an ultra-large interlayer spacing (2.34 nm), superior electrical conductivity/hydrophilicity, and robust layered structure, demonstrating highly reversible NH4+/Zn2+/H+ co-insertion/extraction chemistry in the 1 M ZnSO4 + 0.5 M (NH4)2SO4 aqueous electrolyte. The NH4+ and H+ ions can act as gap fillers to fully utilize the active sites and screen electrostatic interactions to accelerate the Zn2+ diffusion. Thus, unprecedentedly high rate capability (439.5 and 104.3 mAh g-1 at 0.1 and 30 A g-1, respectively) and ultra-long cycling life (8000 cycles) are achieved.
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