Journal
CHEMSUSCHEM
Volume 8, Issue 13, Pages 2212-2222Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201500256
Keywords
amorphous materials; lithium-ion batteries; microspheres; mixed-valent compounds; vanadium oxide
Funding
- National Natural Science Foundation of China [21471016, 21271023]
- 111 Project [B07012]
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Constructing three-dimensional (3D) nanostructures with excellent structural stability is an important approach for realizing high-rate capability and a high capacity of the electrode materials in lithium-ion batteries (LIBs). Herein, we report the synthesis of hydrangea-like amorphous mixed-valence VOx microspheres (a-VOx MSs) through a facile solvothermal method followed by controlled calcination. The resultant hydrangea-like a-VOx MSs are composed of intercrossed nanosheets and, thus, construct a 3D network structure. Upon evaluation as an anode material for LIBs, the a-VOx MSs show excellent lithium-storage performance in terms of high capacity, good rate capability, and long-term stability upon extended cycling. Specifically, they exhibit very stable cycling behavior with a highly reversible capacity of 1050mAhg(-1) at a rate of 0.1Ag(-1) after 140cycles. They also show excellent rate capability, with a capacity of 390mAhg(-1) at a rate as high as 10Ag(-1). Detailed investigations on the morphological and structural changes of the a-VOx MSs upon cycling demonstrated that the a-VOx MSs went through modification of the local VO coordinations accompanied with the formation of a higher oxidation state of V, but still with an amorphous state throughout the whole discharge/charge process. Moreover, the a-VOx MSs can buffer huge volumetric changes during the insertion/extraction process, and at the same time they remain intact even after 200cycles of the charge/discharge process. Thus, these microspheres may be a promising anode material for LIBs.
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