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|Title:||3D Hollow α-MnO₂ framework as an efficient electrocatalyst for lithium–oxygen batteries|
|Citation:||Small, 2019; 15(10):e1804958-1-e1804958-7|
|Ran Bi, Guoxue Liu, Cheng Zeng, Xinping Wang, Lei Zhang, Shi‐Zhang Qiao|
|Abstract:||Lithium-oxygen (Li-O2 ) batteries are attracting more attention owing to their superior theoretical energy density compared to conventional Li-ion battery systems. With regards to the catalytically electrochemical reaction on a cathode, the electrocatalyst plays a key role in determining the performance of Li-O2 batteries. Herein, a new 3D hollow α-MnO2 framework (3D α-MnO2 ) with porous wall assembled by hierarchical α-MnO2 nanowires is prepared by a template-induced hydrothermal reaction and subsequent annealing treatment. Such a distinctive structure provides some essential properties for Li-O2 batteries including the intrinsic high catalytic activity of α-MnO2 , more catalytic active sites of hierarchical α-MnO2 nanowires on 3D framework, continuous hollow network and rich porosity for the storage of discharge product aggregations, and oxygen diffusion. As a consequence, 3D α-MnO2 achieves a high specific capacity of 8583 mA h g-1 at a current density of 100 mA g-1 , a superior rate capacity of 6311 mA h g-1 at 300 mA g-1 , and a very good cycling stability of 170 cycles at a current density of 200 mA g-1 with a fixed capacity of 1000 mA h g-1 . Importantly, the presented design strategy of 3D hollow framework in this work could be extended to other catalytic cathode design for Li-O2 batteries.|
|Keywords:||3D framework; Li-O2 battery; hollow structure; α-MnO2|
|Rights:||© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim|
|Appears in Collections:||Chemical Engineering publications|
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