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Facile preparation of unique three-dimensional (3D) α-MnO2/MWCNTs macroporous hybrid as the high-performance cathode of rechargeable Li-O2 batteries.
- Source :
- Nano Research; Jan2019, Vol. 12 Issue 1, p69-75, 7p
- Publication Year :
- 2019
-
Abstract
- Undoubtedly, there remains an urgent prerequisite to achieve significant advances in both the specific capacity and cyclability of Li-O<subscript>2</subscript> batteries for their practical application. In this work, a series of unique three-dimensional (3D) α-MnO<subscript>2</subscript>/MWCNTs hybrids are successfully prepared using a facile lyophilization method and investigated as the cathode of Li-O<subscript>2</subscript> batteries. Thereinto, cross-linked α-MnO<subscript>2</subscript>/MWCNTs nanocomposites are first synthesized via a modified chemical route. Results demonstrate that MnO<subscript>2</subscript> nanorods in the nanocomposites have a length of 100-400 nm and a diameter ranging from 5 to 10 nm, and more attractively, the as-lyophilized 3D MnO<subscript>2</subscript>/MWCNTs hybrids is uniquely constructed with large amounts of interconnected macroporous channels. The Li-O<subscript>2</subscript> battery with the 3D macroporous hybrid cathode that has a mass percentage of 50% of α-MnO<subscript>2</subscript> delivers a high discharge specific capacity of 8,643 mAh·g<superscript>−1</superscript> at 100 mA·g<superscript>−1</superscript>, and maintains over 90 cycles before the discharge voltage drops to 2.0 V under a controlled specific capacity of 1,000 mAh·g<superscript>−1</superscript>. It is observed that when being recharged, the product of toroidal Li<subscript>2</subscript>O<subscript>2</subscript> particles disappears and electrode surfaces are well recovered, thus confirming a good reversibility. The excellent performance of Li-O<subscript>2</subscript> battery with the 3D α-MnO<subscript>2</subscript>/MWCNTs macroporous hybrid cathode is ascribed to a synergistic combination between the unique macroporous architecture and highly efficient bi-functional α-MnO<subscript>2</subscript>/MWCNTs electrocatalyst. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 12
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 133611880
- Full Text :
- https://doi.org/10.1007/s12274-018-2182-x