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Title: Synthesis of nitrogen-doped KMn₈ O₁₆ with oxygen vacancy for stable zinc-ion batteries
Authors: Cui, Guodong
Zeng, Yinxiang
Wu, Jinfang
Guo, Yan
Gu, Xiaojun
Lou, David Xiong Wen
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Cui, G., Zeng, Y., Wu, J., Guo, Y., Gu, X. & Lou, D. X. W. (2022). Synthesis of nitrogen-doped KMn₈ O₁₆ with oxygen vacancy for stable zinc-ion batteries. Advanced Science, 9(10), 2106067-.
Journal: Advanced Science 
Abstract: The development of MnO2 as a cathode for aqueous zinc-ion batteries (AZIBs) is severely limited by the low intrinsic electrical conductivity and unstable crystal structure. Herein, a multifunctional modification strategy is proposed to construct N-doped KMn8 O16 with abundant oxygen vacancy and large specific surface area (named as N-KMO) through a facile one-step hydrothermal approach. The synergetic effects of N-doping, oxygen vacancy, and porous structure in N-KMO can effectively suppress the dissolution of manganese ions, and promote ion diffusion and electron conduction. As a result, the N-KMO cathode exhibits dramatically improved stability and reaction kinetics, superior to the pristine MnO2 and MnO2 with only oxygen vacancy. Remarkably, the N-KMO cathode delivers a high reversible capacity of 262 mAh g-1 after 2500 cycles at 1 A g-1 with a capacity retention of 91%. Simultaneously, the highest specific capacity can reach 298 mAh g-1 at 0.1 A g-1 . Theoretical calculations reveal that the oxygen vacancy and N-doping can improve the electrical conductivity of MnO2 and thus account for the outstanding rate performance. Moreover, ex situ characterizations indicate that the energy storage mechanism of the N-KMO cathode is mainly a H+ and Zn2+ co-insertion/extraction process.
ISSN: 2198-3844
DOI: 10.1002/advs.202106067
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.This is an open access article under the terms of the Creative CommonsAttribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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