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Indexed by:期刊论文

Date of Publication:2018-06-01

Journal:MATERIALS CHEMISTRY AND PHYSICS

Included Journals:SCIE

Volume:211

Page Number:452-461

ISSN No.:0254-0584

Key Words:Yolk-shell hollow microspheres; Ni and Co doped Fe2O3; Controlled morphologies and compositions; Lithium-ion batteries

Abstract:Ni and Co doped Fe2O3 hollow microspheres of yolk-shell type were designed and synthesized by using resin (RF-COOH) microspheres as hard template and subsequent calcination. Specific morphologies (walnut-like, jingle-bell-like and ball-like) and compositions of Fe2O3 with different amounts of Ni and Co doping were obtained by tuning metal precursor concentration to optimize their performance in lithium-ion battery application. When Ni and Co doped Fe2O3 hollow microspheres were used as anode materials for lithium-ion batteries, jingle-bell-like and ball-like morphologies showed better electrochemical performance with specific capacities of 415.7 and 414.1 mA h/g, respectively up to 200 cycles due to their stable construction with hollow cavity, porous shell and Ni and Co dopants. However, the specific capacity of Ni and Co doped Fe2O3@TiO2 hollow microspheres increased to 562 mA h/g. This work showed a new avenue for designing and fabricating yolk-shell hollow structures with specific morphologies and compositions in order to optimize their specific capacity for use in lithium-ion batteries. (C) 2018 Elsevier B.V. All rights reserved.