Rechargeable aqueous zinc ion batteries(AZIBs)were considered as one of the most promising candidates for large-scale energy storage due to the merits of high safety and inexpensiveness.As AZIBs cathode material,MnO2 possesses great merits but was greatly hindered due to the sluggish diffusion kinetic of Zn2+during electrochemical operations.Herein,deep Zn2+ions intercalated δ-MnO2(Zn-MnO2)was achieved by the in situ electrochemical deposition route,which significantly enhanced the diffusion abil-ity of Zn2+due to the synergistic effects of Zn2+pillars and structural H2O.The resultant Zn-MnO2 based AZIBs delivers a record capacity of 696mAh/g(0.5 mAh/cm2)based on the initial mass loading,which is approaching the theoretical capacity of MnO2 with a two-electrons reaction.In-situ Raman studies reveal highly reversible Zn2+ions insertion/extraction behaviors and here the Zn-MnO2 plays the role of a con-tainer during the charge-discharge process.Further charge storage mechanism investigations point out the insertion/extraction of Zn2+and H+coincides,and such process is significantly facilitated results from superior interlayered configurations of Zn-MnO2 The excellent electrochemical performance of Zn-MnO2 achieved in this work suggests the deep ions pre-intercalation strategy may aid in the future develop-ment of advanced cathodes for AZIBs.

Yaxiong Zhang;Xiaosha Cui;Yupeng Liu;Situo Cheng;Peng Cui;Yin Wu;Zhenheng Sun;Zhipeng Shao;Jiecai Fu;Erqing Xie

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,Gansu,China

能源化学

[1]Yaxiong Zhang;Xiaosha Cui;Yupeng Liu;Situo Cheng;Peng Cui;Yin Wu;Zhenheng Sun;Zhipeng Shao;Jiecai Fu;Erqing Xie-.Aqueous Zn-MnO2 battery:Approaching the energy storage limit with deep Zn2+pre-intercalation and revealing the ions insertion/extraction mechanisms)[J].能源化学,2022(04):225-232

Zn2+pre,inexpensiveness,Zn2+during,Zn2+due,Zn2+pillars,696mAh,tainer,H+coincides

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