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Template‐Free Fabrication of Hollow NiO–Carbon Hybrid Nanoparticle Aggregates with Improved Lithium Storage
Author(s) -
Guo Hong,
Wang Yapeng,
Wang Wei,
Liu Lixiang,
Guo Yuanyuan,
Yang Xiangjun,
Wang Shixiong
Publication year - 2014
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201300198
Subject(s) - materials science , non blocking i/o , anode , chemical engineering , ethylene glycol , calcination , nanoparticle , electrode , lithium (medication) , carbon fibers , electrochemistry , amorphous carbon , nanotechnology , lithium ion battery , solvothermal synthesis , amorphous solid , composite material , composite number , battery (electricity) , organic chemistry , catalysis , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Hollow NiO–carbon hybrid nanoparticle aggregates are fabricated through an environmental template‐free solvothermal alcoholysis route. Controlled hollow structure is achieved by adjusting the ratio of ethylene glycol to water and reaction time of solvothermal alcoholysis. Amorphous carbon can be loaded on the NiO nanoparticles uniformly in the solvothermal alcoholysis process, and the subsequent calcination results in the formation of hollow NiO–C hybrid nanoparticle aggregates. As anode materials for lithium‐ion batteries, it exhibits a stable reversible capacity of 622 mAh g −1 , and capacity retention keeps over 90.7% after 100 cycles at constant current density of 200 mA g −1 . The NiO–C electrode also exhibits good rate capabilities. The unique hollow structures can shorten the length of Li‐ion diffusion and offer a sufficient void space, which sufficiently alleviates the mechanical stress caused by volume change. The hybrid carbon in the particles renders the electrode having a good electronic conductivity. Here, the hollow NiO‐C hybrid electrode exhibits excellent electrochemical performance.