期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms12108
关键词
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资金
- NIMTE from Strategic Priority Research Program of Chinese Academy of Sciences (CAS) [XDA09010101]
- CAS [174433KYSB20150047]
- Department of Energy, USA (CAS-DOE) [174433KYSB20150047]
- Ningbo Science and Technology Innovation Team [2012B82001]
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy (DOE) under the Advanced Battery Materials Research (BMR) Program [DE-AC02-05CH11231, 7073923]
- U.S. DOE, Office of Basic Energy Science, Division of Materials Science and Engineering [DE-AC02-98CH10886]
- office of Basic Energy Sciences (BES), the Office of Science of the U.S. DOE
Lattice oxygen can play an intriguing role in electrochemical processes, not only maintaining structural stability, but also influencing electron and ion transport properties in high-capacity oxide cathode materials for Li-ion batteries. Here, we report the design of a gas-solid interface reaction to achieve delicate control of oxygen activity through uniformly creating oxygen vacancies without affecting structural integrity of Li-rich layered oxides. Theoretical calculations and experimental characterizations demonstrate that oxygen vacancies provide a favourable ionic diffusion environment in the bulk and significantly suppress gas release from the surface. The target material is achievable in delivering a discharge capacity as high as 301 mAhg(-1) with initial Coulombic efficiency of 93.2%. After 100 cycles, a reversible capacity of 300 mAhg(-1) still remains without any obvious decay in voltage. This study sheds light on the comprehensive design and control of oxygen activity in transition-metal-oxide systems for next-generation Li-ion batteries.
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