TY - JOUR
T1 - The influence of large cations on the electrochemical properties of tunnel-structured metal oxides
AU - Yuan, Yifei
AU - Zhan, Chun
AU - He, Kun
AU - Chen, Hungru
AU - Yao, Wentao
AU - Sharifi-Asl, Soroosh
AU - Song, Boao
AU - Yang, Zhenzhen
AU - Nie, Anmin
AU - Luo, Xiangyi
AU - Wang, Hao
AU - Wood, Stephen M.
AU - Amine, Khalil
AU - Islam, M. Saiful
AU - Lu, Jun
AU - Shahbazian-Yassar, Reza
N1 - Publisher Copyright:
© The Author(s) 2016.
PY - 2016/11/21
Y1 - 2016/11/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84995923571&partnerID=8YFLogxK
U2 - 10.1038/ncomms13374
DO - 10.1038/ncomms13374
M3 - Article
AN - SCOPUS:84995923571
SN - 2041-1723
VL - 7
JO - Nature Communications
JF - Nature Communications
M1 - 13374
ER -