One-pot surface engineering of battery electrode materials with metallic SWCNT-enriched, ivy-like conductive nanonets

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Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 5, Issue: 24, Page: 12103-12112

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Yoo, JongTae; Ju, Young-Wan; Jang, Ye-Ri; Gwon, Ohhun; Park, Sodam; Kim, Ju-Myung; Lee, Chang Kee; Lee, Sun-Young; Yeon, Sun-Hwa; Kim, Guntae; Lee, Sang-Young Show More Hide
Royal Society of Chemistry (RSC); The Royal Society of Chemistry; ROYAL SOC CHEMISTRY
Chemistry; Energy; Materials Science
article description
A longstanding challenge facing energy conversion/storage materials is their low electrical conductivity, which often results in unwanted sluggish electrochemical reactions. Here, we demonstrate a new class of one-pot surface engineering strategy based on metallic single-walled carbon nanotube (mSWCNT)-enriched, ivy-like conductive nanonets (mSC nanonets). The mSC nanonets are formed on the surface of electrode materials through a poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO)-assisted sonication/filtration process. PFO is known as a dispersant for SWCNTs that shows a higher affinity for semiconducting SWCNTs (sSWCNTs) than for mSWCNTs. Driven by this preferential affinity of PFO, sSWCNTs are separated from mSWCNTs in the form of sSWCNT/PFO hybrids, and the resulting enriched mSWCNTs are uniformly deposited on electrode materials in the form of ivy-like nanonets. Various electrode materials, including lithium-ion battery cathodes/anodes and perovskite catalysts, are chosen to explore the feasibility of the proposed concept. Due to their ivy-like conductive network, the mSC nanonets increase the electronic conductivity of the electrode materials without hindering their ionic transport, eventually enabling significant improvements in their redox reaction rates, charge/discharge cyclability, and bifunctional electrocatalytic activities. These exceptional physicochemical advantages of the mSC nanonets, in conjunction with the simplicity/versatility of the one-pot surface engineering process, offer a new and facile route to develop advanced electrode materials with faster electrochemical reaction kinetics.