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An ordered mesoporous network consisting of carbon‐coated ultrasmall SnO 2 nanoparticles with enhanced Lithium storage
Author(s) -
Zhao Yun,
Lin Qidong,
Li Yong,
Ma Canliang
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13066
Subject(s) - materials science , mesoporous material , faraday efficiency , chemical engineering , nanoparticle , lithium (medication) , carbon fibers , nanotechnology , electrolyte , coating , composite number , electrochemistry , electrode , composite material , organic chemistry , catalysis , medicine , chemistry , endocrinology , engineering
An unique ordered mesoporous network consisting of carbon‐coated SnO 2 nanoparticles (NPs) is developed by a facile self‐assemble strategy via a solvethermal route in which employs N,N‐dimethylformamide/H 2 O as mixture solvent and polyvinyl pyrrolidone as barrier agent and carbon source. The SnO 2 ‐NPs with an uniform dimension of ~5 nm are observed to interconnect with each other, and assemble into high‐compact blocks where abundant mesopores with an average diameter of ~4 nm are found throughout the body. The carbon coating with a thickness of <1 nm are confirmed to exist on these SnO 2 ‐NPs, which is of great importance to avoid the severe sintering that occurs in the case of bare SnO 2 ‐NPs. Furthermore, the carbon coating plays roles in enhancing conductivity and keeping the active particles from being directly contacted with electrolyte, and thus contributes to enhanced reversible capacity of 949 mAh g −1 and improved initial Coulombic efficiency. The composite electrode with a high tap density of 2.0 g cm −3 exhibits substantially elevated electrochemical performances, such as a charge capacity of 565 mAh g −1 vs 223 mAh g −1 of common SnO 2 ‐NPs after 60 cycles and greatly improved rate capability, indicating the promising applications of this advanced micro‐nano architecture for next‐generation lithium‐ion batteries.