Journal
CHEMICAL ENGINEERING SCIENCE
Volume 200, Issue -, Pages 38-45Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.01.043
Keywords
V2O5; Hollow microsphere; Hierarchical surface; Diffusion control; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [91534202, 21838003]
- Basic Research Program of Shanghai [17JC1402300, 18DZ2252400]
- Innovation Program of Shanghai Municipal Education Commission
- Shanghai Scientific and Technological Innovation Project [18JC1410500]
- Fundamental Research Funds for the Central Universities [222201718002]
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Exploiting a simple and effective strategy to build shell-tuned hollow nanomaterials with unchanged surface microstructure is a great challenge but important for lithium-ion batteries (LIBs). Herein, we demonstrate the synthesis of V2O5 hollow microspheres, where the hierarchical shell thickness can be changed by controlling internal-diffusion rate of the core precursor. The fascinating nanostructures can guarantee the full contact with electrolyte with shortened ions diffusion path. Meantime, the self-created pores can effectively alleviate the volume change in the charge/discharge process. When evaluated as cathode materials, the V2O5 hollow microspheres can deliver a high reversible specific capacity of 287 and 140 mAh g(-1) at 1/3 C and 10 C, respectively with a good cycling stability. After inserting Li+, the corresponding Li3VO4/CNTs nanoparticles are obtained as anode materials, also exhibiting a high specific capacity of 200 mAh g(-1) even after 800 cycles at 1000 mA g(-1). An all-vanadium-based lithium-ion full battery (V2O5//Li3VO4/CNTs) is assembled, which gives a high specific capacity of 55 mAh g(-1) at 5000 mA g(-1) even after 1000 cycles based on the cathode material weight. (C) 2019 Elsevier Ltd. All rights reserved.
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