Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 10, Pages 3256-3262Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm501025r
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [51372268]
- National 973 Program of China [2009CB220100]
- U.S. Department of Energy
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies [DEAC02-98CH10886]
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Layer-structured xLi(2)MnO(3)center dot(1 - x)LiMO2 are promising cathode materials for high energy-density Li-ion batteries because they deliver high capacities due to the stabilizing effect of Li2MnO3. However, the inherent disadvantages of Li2MnO3 make these materials suffer from drawbacks such as fast energy-density decay, poor rate performance and safety hazard. In this paper, we propose to replace Li2MnO3 with Li2MoO3 for constructing novel Li-rich cathode materials and evaluate its feasibility. Comprehensive studies by X-ray diffraction, X-ray absorption spectroscopy, and spherical-aberration-corrected scanning transmission electron microscopy clarify its lithium extraction/insertion mechanism and shows that the Mo4+/Mo6+ redox couple in Li2MoO3 can accomplish the task of charge compensation upon Li removal. Other properties of Li2MoO3 such as the nearly reversible Mo-ion migration to/from the Li vacancies, absence of oxygen evolution, and reversible phase transition during initial (de)lithiation indicate that Li2MoO3 meets the requirements to an ideal replacement of Li2MnO3 in constructing Li2MoO3-based Li-rich cathode materials with superior performances.
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