title: In situ carbon-coated yolk-shell V2O3 microspheres for lithium-ion batteries.
abstract: Metal oxide-based materials with yolk-shell morphology have been intensively investigated as important anodes for Li-ion batteries due to their large ion storage ability, high safety, and excellent cycling stability. In this work, in situ carbon-coated yolk-shell V2O3 microspheres were synthesized via a template-free polyol solvothermal method. The growth of yolk-shell microspheres underwent coordination and polymerization, followed by an inside-out Ostwald-ripening process and further calcination in N2 atmosphere. The thin amorphous carbon layers coating on the microspheres' surface came from polyol frameworks which could protect V2O3 during the charge-discharge process and led to a better stability in Li-ion batteries. The in situ carbon-coated yolk-shell V2O3 microspheres showed a capacity of 437.5 mAh·g(-1) after 100 cycles at a current density of 0.1 A·g(-1), which was 92.6% of its initial capability (472.5 mAh·g(-1)). They were regarded as excellent electrode materials for lithium-ion batteries and exhibit good electrochemistry performance and stability.
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University , Harbin 150080, P. R. China.
authors.forename: Le
authors.initials: L
authors.lastname: Jiang
authors.forename: Yang
authors.initials: Y
authors.lastname: Qu
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Ren
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.forename: Dongdong
authors.initials: D
authors.lastname: Zhao
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Honggang
authors.initials: H
authors.lastname: Fu
keywords: Li-ion battery; in-situ carbon coating; microsphere; vanadium oxide; yolk−shell