Journal
CHEMICAL ENGINEERING JOURNAL
Volume 388, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124119
Keywords
Pseudocapacitance; Solid electrolyte interphase; Self-assemble; Fe2O3; Lithium battery
Categories
Funding
- National Natural Science Foundation of China [51672165, 51702198]
- Postdoctoral Foundation of China [155660, 2016M592897XB]
- Natural Science Foundation of Shaanxi Province [2018JQ5107]
- National Key Research and Development Program of China [2017YFB0308303-03]
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Constructing pseudocapacitive materials to combine the battery-level energy density with the cycle life and power density of supercapacitors is a promising energy storage technique. Nanostructuring can greatly induce extrinsic pseudocapacitance, but excessive solid electrolyte interphase (SEI) as the activity surface increases usually results in a poor coulombic efficiency (CE) of battery. Here, we separately investigate the electro-chemical properties of self-assembled Fe2O3 mulberry architecture, quantum dots and bulk particles. Employed as an anode of lithium ion battery, the mulberry architecture retains a dominant pseudocapacitance behavior and high electrochemical activity. It delivers an initial capacity of 1383.8 mAh g(-1), 22.1% higher than Fe2O3 bulk in similar size, in which the pseudocapacitance contribution up to 80.6% at 0.4 mV s(-1). Furthermore, the mulberry architecture decreases the activity surface contacted with electrolyte to enable a limited SEI, achieving a higher coulombic efficiency (initial CE: 80.1%, average CE: 98.9%) well above that of individual quantum dots. This work is expected to inspire the design of novel high-performance anode materials.
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