Journal
JOURNAL OF POWER SOURCES
Volume 378, Issue -, Pages 460-467Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.12.077
Keywords
Phosphorus/carbon composite; Red phosphorus; Black phosphorus; Anode material; Phosphorus-carbon bond; Potassium-ion batteries
Funding
- National Natural Science Foundation of China [U1730136]
- Fundamental Research Funds for the Central Universities [2017XKQY062]
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Potassium-ion batteries are attracting great attention as a promising alternative to lithium-ion batteries due to the abundance and low price of potassium. Herein, the phosphorus/carbon composite, obtained by a simple ball milling of 20 wt% commercial red phosphorus and 80 wt% graphite, is studied as a novel anode for potassium ion batteries. Considering the high theoretical specific capacity of phosphorus and formation of stable phosphorus-carbon bond, which can alleviate the volume expansion efficiently, the phosphorus/carbon composite exhibits a high charge capacity of 323.5 mA h g(-1) after 50 cycles at a current density of 50 mA g-1 with moderate rate capability and cycling stability. By the X-ray diffraction analysis, the alloying-dealloying mechanism of phosphorus is proposed to form a KP phase. Meanwhile, prepotassiation treatment is conducted to improve the low initial coulomb efficiency.
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