The influence of large cations on the electrochemical properties of tunnel-structured metal oxides

Yifei Yuan, Chun Zhan, Kun He, Hungru Chen, Wentao Yao, Soroosh Sharifi-Asl, Boao Song, Zhenzhen Yang, Anmin Nie, Xiangyi Luo, Hao Wang, Stephen M. Wood, Khalil Amine, M. Saiful Islam (), Jun Lu () and Reza Shahbazian-Yassar ()
Additional contact information
Yifei Yuan: Michigan Technological University
Chun Zhan: Argonne National Laboratory
Kun He: University of Illinois at Chicago
Hungru Chen: University of Bath
Wentao Yao: Michigan Technological University
Soroosh Sharifi-Asl: University of Illinois at Chicago
Boao Song: University of Illinois at Chicago
Zhenzhen Yang: Argonne National Laboratory
Anmin Nie: University of Illinois at Chicago
Xiangyi Luo: Argonne National Laboratory
Hao Wang: Argonne National Laboratory
Stephen M. Wood: University of Bath
Khalil Amine: Argonne National Laboratory
M. Saiful Islam: University of Bath
Jun Lu: Argonne National Laboratory
Reza Shahbazian-Yassar: University of Illinois at Chicago

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Metal oxides with a tunnelled structure are attractive as charge storage materials for rechargeable batteries and supercapacitors, since the tunnels enable fast reversible insertion/extraction of charge carriers (for example, lithium ions). Common synthesis methods can introduce large cations such as potassium, barium and ammonium ions into the tunnels, but how these cations affect charge storage performance is not fully understood. Here, we report the role of tunnel cations in governing the electrochemical properties of electrode materials by focusing on potassium ions in α-MnO2. We show that the presence of cations inside 2 × 2 tunnels of manganese dioxide increases the electronic conductivity, and improves lithium ion diffusivity. In addition, transmission electron microscopy analysis indicates that the tunnels remain intact whether cations are present in the tunnels or not. Our systematic study shows that cation addition to α-MnO2 has a strong beneficial effect on the electrochemical performance of this material.

Date: 2016
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DOI: 10.1038/ncomms13374

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