Journal
NANO ENERGY
Volume 44, Issue -, Pages 336-344Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2017.12.014
Keywords
Sodium layered oxide cathodes; Alternating heteroepitaxial nanostructure; In-situ composition modulation; Structure transition; Electrochemical performance
Categories
Funding
- Recruitment Program of Global Youth Experts
- National Natural Science Foundation of China [51304248, 11474147]
- National Basic Research Program of China [2015CB654901]
- Natural Science Foundation of Jiangsu Province [BK20151383]
- International Science and Technology Cooperation Program of China [2014DFE00200]
- Innovation Program of Central South University [2016CXS003]
- State Key Laboratory of Powder Metallurgy at Central South University
- Hunan Shenghua Technology Co., Ltd.
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The major hurdle of room temperature sodium-ion batteries (NIBs) for large-scale energy storage applications lies in developing new electrode materials with higher energy/power densities and improved durability. This work presents a novel Na-P3/Li2MnO3 layered composite cathode with an alternating heteroepitaxial nanostructure fabricated by an in-situ composition modulation route. XRD structural refinement, synchrotron XAS and aberration-corrected HAADF-/ABF-STEM were employed to understand the structure evolution accompanying Li substitution. It is revealed that the in-situ formation of Li2MnO3 (Li-O'3) changes the crystallographic and chemical features of the neighboring Na-P3 layered matrix significantly and leads to the alternating Na-P3/Li-O'3 3 heteroepitaxial nanostructure. This alternating heteroepitaxial nanostructure delivers an extremely high reversible capacity of similar to 210 mAh g(-1) between 1.5 and 4.5 V vs. Na/Na+, much improved cycling stability and excellent electrode kinetics. Its enhanced electrochemical performance can be ascribed to the effective suppression of the P3-P3 '' phase transition and subsequent amorphization upon cycling to 4.5 V.
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