期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 10, 期 6, 页码 1456-1464出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee00763a
关键词
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资金
- National Natural Science Foundation of China [21333002, 11574051]
- National Key Research and Development Plan [2016YFB0901500]
- Natural Science Foundation of Shanghai [14ZR1403400]
- Fudan High-End Computing Center
- Australian Research Council (ARC) [FT150100109, FT160100251, DP170102406]
To date, anode materials for lithium-ion batteries (LIBs) have been dominated by carbonaceous materials, which have a low intercalation potential but easily allow lithium dendrites to form under high current density, leading to a safety risk. The other anode material, the zero-strain'' spinel-structured Li4Ti5O12, with a similar to 1.5 V vs. Li+/Li intercalation potential, exhibits excellent cycling stability and avoids the issues of dendrite growth and Li plating. The low capacity and high voltage of Li4Ti5O12, however, result in low energy density. Herein, we report a new and environmentally friendly anode material, Li2TiSiO5, which delivers a capacity as high as 308 mA h g(-1), with a working potential of 0.28 V vs. Li+/Li, and excellent cycling stability. The lithium-storage mechanism of this material is also proposed based on the combination of in situ synchrotron X-ray diffraction, neutron powder diffraction with Fourier density mapping, ex situ X-ray absorption near edge structure analysis, ex situ transmission electron microscopy, and density-functional theory calculations with the projector-augmented-wave formalism. The lithium-storage mechanism of this material is shown to involve a two-electron (Ti4+/Ti2+ redox) conversion reaction between TiO and Li4SiO4.
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