Journal
CHEM
Volume 5, Issue 1, Pages 168-179Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2018.10.004
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Funding
- National Natural Science Foundation of China [51522101, 51471075, 21725103, 51472232, 51631004]
- National Key R&D Program of China [2017YFA0206700, 2016YFB0100100]
- Program for the JLU Science and Technology Innovative Research Team [2017TD-09]
- Fundamental Research Funds for the Central Universities
- Technology and Industry for National Defense of the People's Republic of China [JCKY2016130B010]
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Potassium-ion batteries (KIBs) are a promising alternative to lithium-ion batteries because of the abundance, low cost, and redox potential of K; however, the significantly larger radius of K+ inevitably destabilizes the crystal structure of the cathode material, impeding the diffusion of K+. Here, to lower the insertion energetics and diffusion barriers of K+, we synthesized delta-K0.51V2O5 nanobelts (KVOs) with a large interlayered structure and optimized growth orientation by reconstructing the V-O polyhedra of orthorhombic V2O5; these exhibited a high average voltage (3.2 V), high capacity (131 mAh g(-1)), and superior rate capability even at 10 A g(-1). By coupling the electrochemical experiments with theoretical calculations, we found that the excellent K-ion storage performance of KVO is attributed to its large interlayered structure and unique 1D morphology. Additionally, we assembled a full KIB composed of KVO and graphite with high energy and power densities, proving its feasibility as a promising new battery.
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