Synthesis of carbon nanotube-iron oxide composites via combustion waves for hybrid Li-ion battery anodes

[Display omitted] •Carbon nanotube (CNT)-FexOy composites (CFs) are developed for lithium-ion batteries.•CNT-guided combustion waves offer scalable synthesis-optimization strategy for CFs.•CNTs provide path of thermochemical reaction and help disperse iron oxide particles.•CNTs form conductive netwo...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-08, Vol.470, p.144260, Article 144260
Main Authors: Park, Seonghyun, Seo, Byungseok, Shin, Dongjoon, Chae, Seunghoon, Cho, Hyunjoon, Kim, Sangtae, Choi, Wonjoon
Format: Article
Language:English
Subjects:
Carbon nanotubes
Combustion synthesis
Electrode
Iron oxide
Li-ion battery
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Summary:[Display omitted] •Carbon nanotube (CNT)-FexOy composites (CFs) are developed for lithium-ion batteries.•CNT-guided combustion waves offer scalable synthesis-optimization strategy for CFs.•CNTs provide path of thermochemical reaction and help disperse iron oxide particles.•CNTs form conductive network and prevent loose FexOy particles during pulverization.•Optimized CFs exhibit notably high cycle capacity, rate capability and cycle life. The design and synthesis of suitable transition metal oxide (TMO) with carbonaceous material are crucial to produce high-performance anodes for Lithium-ion batteries (LIBs). Here, we show a facile synthesis method for iron oxide and carbon nanotube (CNT) composite via CNT-guided combustion waves. The combustion waves propagate through a freestanding film composed of multi-walled CNTs (MWCNTs), iron nitrate, and combustible nitrocellulose, synthesizing the composite in one-pot within a few seconds. The resulting composite consists of MWCNT networks encapsulating iron oxide submicron particles (CFs). The composite electrode employing optimized CFs provides exceptional initial specific capacity and rate capability (792 mAh/g at 0.1C and 588 mAh/g at 5C) and an increased capacity of 1215 mAh/g after 500 charge–discharge cycles at 1C. The morphological and electrochemical characterization reveal pulverized nanoparticles encapsulated within MWCNT networks, entailing hybrid capacities of redox conversion and pseudocapacitance. This facile synthesis method for TMO–MWCNT composites provides a feasible family of low-cost composite electrodes for high-performance LIBs.
ISSN:1385-8947
DOI:10.1016/j.cej.2023.144260