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Elaborately Designed Hierarchical Heterostructures Consisting of Carbon‐Coated TiO 2 (B) Nanosheets Decorated with Fe 3 O 4 Nanoparticles for Remarkable Synergy in High‐Rate Lithium Storage
Author(s) -
Xu Hao,
Zhu XiaoDong,
Sun KeNing,
Liu YiTao,
Xie XuMing
Publication year - 2015
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201500239
Subject(s) - materials science , anode , heterojunction , nanoparticle , lithium (medication) , nanotechnology , carbon fibers , chemical engineering , optoelectronics , electrode , composite material , composite number , medicine , chemistry , endocrinology , engineering
The capacity and conductivity deficiencies of TiO 2 (B) are addressed simultaneously through a smart morphological and compositional design. Elaborately designed hierarchical heterostructures are reported, consisting of carbon‐coated TiO 2 (B) nanosheets decorated with Fe 3 O 4 nanoparticles, based on a facile self‐assembly strategy. The novel hierarchical heterostructures exhibit a remarkable synergy by bridging the intriguing functionalities of TiO 2 (B) nanosheets (high safety and durability), Fe 3 O 4 nanoparticles (high theoretical capacity), and carbon coatings (high conductivity), which results in significantly improved cycle and rate performances. A startlingly high reversible capacity of 763 mA h g −1 is delivered at 500 mA g −1 after 200 charging−discharging cycles. Even when the current density is as high as 10 000 mA g −1 , the reversible capacity is still up to 498 mA h g −1 . This smart morphological and compositional design opens up new opportunities for developing novel, multifunctional hierarchical heterostructures as promising anode materials for next‐generation, high‐power lithium‐ion batteries.