Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 38, Pages 18909-18915Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp206012v
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Funding
- Department of Energy Office of Basic Energy Science [DE-SC0005397]
- National Science Foundation [0821312]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0821312] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0005397] Funding Source: U.S. Department of Energy (DOE)
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Mo3Sb7-C composite has been synthesized by first firing a mixture of Mo and Sb metals and then ball-milling the resultant material with carbon. X-ray diffraction (XRD), high-resolution transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) data reveal that these composites are composed of uniformly dispersed, submicrometer sized, crystalline Mo3Sb7 in a conductive carbon matrix. The presence of carbon in the composite drastically improves the cycle life of Mo3Sb7 as the carbon buffers the volume changes occurring during charge-discharge cycling. With a discharge capacity of 518 mAh/g and 907 mAh/cm(3) and a tap density of 1.75 g/cm(3) for the composite, the Mo3Sb7-C composite anodes offer three times higher volumetric capacity than the graphite anode. Also, with an operating voltage (similar to 0.8 V) well above that of Li/Li+, the Mo3Sb7-C composite anodes offer better safety.
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