High performance of LiNi0.5Mn0.5O2 positive electrode boosted by ordered three-dimensional nanostructures
| Autor: | Jikang Yuan, Steven L. Suib, Helen L. W. Chan, Yumin Liu, Bolei Chen, Feng Cao, Xingzhong Zhao |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Nanostructure Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Nanotechnology Manganese Electrochemistry Molecular sieve Lithium-ion battery Octahedron chemistry Chemical engineering Electrode Nanorod Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 206:230-235 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2012.01.069 |
| Popis: | Three-dimensional LiNi 0.5 Mn 0.5 O 2 (3D-LiNi 0.5 Mn 0.5 O 2 ) nanostructures are in situ prepared using cryptomelane-type octahedral molecular sieve manganese dioxide (OMS-2) in the form of dendritic nanostructures as templates. The complete conversion of the OMS-2 precursor to layered α-NaFeO 2 -type LiNi 0.5 Mn 0.5 O 2 and the retention of the 3D dendritic nanostructures have been confirmed by XRD, FE-SEM, TEM, and HR-TEM. The as-synthesized nanostructured positive electrode exhibits a significant improvement in rate performance and cycling reversibility due to its unique nanostructures composed of single-crystalline LiNi 0.5 Mn 0.5 O 2 nanorods. And the influence of the assembly mode of nanosize LiNi 0.5 Mn 0.5 O 2 positive electrode material to its electrochemical performances has been investigated. The battery based on 3D-LiNi 0.5 Mn 0.5 O 2 retains a discharge capacity of 151.6 mAh g −1 (93% of the first discharge capacity) after 50 cycles. A specific discharge capacity of 141.8 mAh g −1 was retained at a rate of 3.2 C, which is about 80% of the capacity at a rate of 0.2 C. |
| Databáze: | OpenAIRE |
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