Journal
JOURNAL OF POWER SOURCES
Volume 396, Issue -, Pages 533-541Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.073
Keywords
Potassium storage; Rate performance; Anode; Cotton; Full cell
Funding
- National Key R&D Program of China [2018YFB0905400]
- National Science Foundation of China (NSAF) [U1630106, 51577175]
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Potassium-ion batteries attract tremendous attention for large scale application due to the abundance of K resources. Herein, a highly disordered hard carbon derived from a skimmed cotton is investigated for this purpose. The study shows that a simple soaking treatment in hydrochloric acid for the skimmed cotton before its hight-emperature carbonization can critically impact the structure and the electrochemical properties of the obtained hard carbon significantly. This hard carbon exhibits a high initial coulombic efficiency (73%) and superior cycling stability and rate capability (253mAh g(-1) and 165mAh g(-1) at 40mAg(-1) and 4000mAg(-1), respectively) due to its unique porous architecture and large surface area. The full cell by coupling the hard carbon with a cathode material,i.e. potassium-rich iron hexacyanoferrate shows an outstanding electrochemical performance. These promising properties highlight the potentials of such a hard carbon in practical applications.
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