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Improved Specific Capacity of Nb 2 O 5 by Coating on Carbon Materials for Lithium‐Ion Batteries
Author(s) -
Yang Fan,
Li Weiyang,
Rui Yichuan,
Tang Bohejin
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801001
Subject(s) - materials science , electrochemistry , anode , graphene , niobium pentoxide , lithium (medication) , carbon fibers , nanoparticle , current density , niobium oxide , chemical engineering , composite number , niobium , nanotechnology , composite material , electrode , metallurgy , chemistry , physics , quantum mechanics , endocrinology , engineering , medicine
Materials for lithium‐ion batteries (LIBs) with excellent electrochemical performance are of significance to meet the increasing demand for rechargeable batteries. Niobium pentoxide (Nb 2 O 5 ), as an intercalation material with promising electrochemical properties has caught our attention. In this study, Nb 2 O 5 nanoparticles were successfully synthesized through a classical sol‐gel process. The nanoparticles with a size of less than 5 nm were uniformly coated on carbon materials, i. e., reduced graphene oxide (rGO) and three‐dimensionally ordered macroporous (3DOM) carbon, under the same proportion, to explore which kind of carbon materials is more suitable to improve the electrochemical performance of Nb 2 O 5 as an anode for LIBs. Nb 2 O 5 /3DOM carbon composite exhibited a superior electrochemical performance to the other two materials, where a high reversible capacity of 519 mA h g −1 could be maintained at the current density of 5.0C (C=201.7 mA g −1 ). Furthermore, the specific capacity of Nb 2 O 5 /3DOM carbon composite maintained 1163 mA h g −1 at the current density of 0.2C (C=201.7 mA g −1 ) after 100 cycles.