Effect of manganese oxide crystal tunnel size on Li-ion and Na-ion battery performance

Bryan W. Byles; Ekaterina Pomerantseva

doi:10.1117/12.2238638

16 September 2016 Effect of manganese oxide crystal tunnel size on Li-ion and Na-ion battery performance

Bryan W. Byles, Ekaterina Pomerantseva

Proceedings Volume 9924, Low-Dimensional Materials and Devices 2016; 992406 (2016) https://doi.org/10.1117/12.2238638
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

The relationship between the volume available within the crystal structure of a material and the size of charge-carrying ions is investigated by evaluating the performance of two manganese oxides with controlled variations in crystal tunnels, α-MnO₂ (K_0.11MnO₂) and todorokite MnO₂ (Mg_0.20MnO₂), in Li-ion and Na-ion batteries. These materials consist of MnO₆ octahedra building blocks arranged into square tunnel configurations around different stabilizing cations, with α-MnO₂ possessing structural tunnels of 4.6 Å by 4.6 Å and todorokite MnO₂ possessing tunnels of 6.9 Å by 6.9 Å. Electrochemical testing of these materials revealed that despite its smaller crystal tunnel size, α-MnO₂ exhibits higher capacities in both battery systems. However, at higher current rates it was found that todorokite MnO₂ maintained a greater amount of its initial capacity. These findings provide valuable insight into the relationship between crystal structure composition and charge-carrying ion size to develop more efficient intercalation cathodes for Li-ion and Na-ion batteries.

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Citation Download Citation

Bryan W. Byles and Ekaterina Pomerantseva "Effect of manganese oxide crystal tunnel size on Li-ion and Na-ion battery performance", Proc. SPIE 9924, Low-Dimensional Materials and Devices 2016, 992406 (16 September 2016); https://doi.org/10.1117/12.2238638

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