The development of a high specific capacity and stable manganese(Mn)-based cathode material is very attractive for aqueous zinc-ion(Zn^(2+))batteries(ZIBs).However,the inherent low electrical conductivity and volume e...The development of a high specific capacity and stable manganese(Mn)-based cathode material is very attractive for aqueous zinc-ion(Zn^(2+))batteries(ZIBs).However,the inherent low electrical conductivity and volume expansion challenges limit its stability improvement.Here,a mesoporous ZnMn_(2)O_(4)(ZMO)nanocage(N-ZMO)coupled with nitrogen doping and oxygen vacancies is prepared by defect engineering and rational structural design as a high-performance cathode material for rechargeable ZIBs.The oxygen vacancies enhance the electrical conductivity of the material and the nitrogen doping releases the strong electrostatic force of the material to maintain a higher structural stability.Interestingly,N-ZMO exhibits excellent ability of Zn^(2+)storage(225.4 mAh·g^(−1)at 0.3 A·g^(−1)),good rate,and stable cycling performance(88.4 mAh·g^(−1)after 1,000 cycles at 3 A·g^(−1)).Furthermore,a flexible quasi-solid-state device with high energy density(261.6 Wh·kg^(−1))is assembled,demonstrating long-lasting durability.We believe that the strategy in this study can provide a new approach for developing aqueous ZIBs.展开更多
基金the National Natural Science Foundation of China(Nos.51702369 and 51873233)Innovation group of National Ethanic Affairs Commission of China(No.MZR20006)+1 种基金Key R&D Plan of Hubei Province(No.2020BAB077)the Fundamental Research Funds for the Central Universities(Nos.CZZ21009 and CZP20006).
文摘The development of a high specific capacity and stable manganese(Mn)-based cathode material is very attractive for aqueous zinc-ion(Zn^(2+))batteries(ZIBs).However,the inherent low electrical conductivity and volume expansion challenges limit its stability improvement.Here,a mesoporous ZnMn_(2)O_(4)(ZMO)nanocage(N-ZMO)coupled with nitrogen doping and oxygen vacancies is prepared by defect engineering and rational structural design as a high-performance cathode material for rechargeable ZIBs.The oxygen vacancies enhance the electrical conductivity of the material and the nitrogen doping releases the strong electrostatic force of the material to maintain a higher structural stability.Interestingly,N-ZMO exhibits excellent ability of Zn^(2+)storage(225.4 mAh·g^(−1)at 0.3 A·g^(−1)),good rate,and stable cycling performance(88.4 mAh·g^(−1)after 1,000 cycles at 3 A·g^(−1)).Furthermore,a flexible quasi-solid-state device with high energy density(261.6 Wh·kg^(−1))is assembled,demonstrating long-lasting durability.We believe that the strategy in this study can provide a new approach for developing aqueous ZIBs.
