Yao Haixin, Yu Huan, Zheng Yaqi, Li Nian Wu, Li Sheng, Luan Deyan, Lou Xiong Wen David, Yu Le
State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Department of Physics, Zhejiang Normal University, Jinhua City, Zhejiang Province, 321004, P. R. China.
Angew Chem Int Ed Engl. 2023 Dec 18;62(51):e202315257. doi: 10.1002/anie.202315257. Epub 2023 Nov 21.
Layered manganese dioxide is a promising cathode candidate for aqueous Zn-ion batteries. However, the narrow interlayer spacing, inferior intrinsic electronic conductivity and poor structural stability still limit its practical application. Herein, we report a two-step strategy to incorporate ammonium ions into manganese dioxide (named as AMO) nanosheets as a cathode for boosted Zn ion storage. K -intercalated δ-MnO nanosheets (KMO) grown on carbon cloth are chosen as the self-involved precursor. Of note, ammonium ions could replace K ions via a facile hydrothermal reaction to enlarge the lattice space and form hydrogen-bond networks. Compared with KMO, the structural stability and the ion transfer kinetics of the layered AMO are enhanced. As expected, the obtained AMO cathode exhibits remarkable electrochemical properties in terms of high reversible capacity, decent rate performance and superior cycling stability over 10000 cycles.
层状二氧化锰是水系锌离子电池中一种很有前景的正极材料。然而，其狭窄的层间距、较差的本征电子导电性和结构稳定性仍限制了其实际应用。在此，我们报道了一种两步策略，即将铵离子引入二氧化锰（命名为AMO）纳米片中作为正极，以增强锌离子存储性能。选择在碳布上生长的钾插层δ-MnO纳米片（KMO）作为自含前驱体。值得注意的是，铵离子可以通过简便的水热反应取代钾离子，从而扩大晶格空间并形成氢键网络。与KMO相比，层状AMO的结构稳定性和离子转移动力学得到了增强。正如预期的那样，所制备的AMO正极在高可逆容量、良好的倍率性能和超过10000次循环的优异循环稳定性方面表现出卓越的电化学性能。
