Indexed by:
期刊论文
First Author:
Zheng, Wenji
Correspondence Author:
Li, XC (reprint author), Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
Co-author:
Yan, Zhijun,Dai, Yan,Du, Naixu,Jiang, Xiaobin,Dai, Hailing,Li, Xiangcun,He, Gaohong
Date of Publication:
2017-06-21
Journal:
ACS APPLIED MATERIALS & INTERFACES
Included Journals:
SCIE、EI、PubMed、Scopus
Document Type:
J
Volume:
9
Issue:
24
Page Number:
20491-20500
ISSN No.:
1944-8244
Key Words:
TiO2; macropore; mesopore; Li ion battery; carbon
Abstract:
Interpenetrated networks between graphitic carbon infilling and ultrafine TiO2 nanocrystals with patterned macropores (100-200 nm) were successfully synthesized. Polypyrrole layer was conformably coated on the primary TiO2 nanoparticles (similar to 8 nm) by a photosensitive reaction and was then transformed into carbon infilling in the interparticle mesopores of the TiO2 nanoparticles. Compared to the carbon/graphene supported TiO2 nanoparticles or carbon coated TiO2 nanostructures, the carbon infilling would provide a conductive medium and buffer layer for volume expansion of the encapsulated TiO2 nanoparticles, thus enhancing conductivity and cycle stability of the C-TiO2 anode materials for lithium ion batteries (LIBs). In addition, the macropores with diameters of 100-200-nm in the C-TiO2 anode and the mesopores in carbon infilling could improve electrolyte transportation in the electrodes and shorten the lithium ion diffusion length. The C-TiO2 electrode can provide a large capacity of 192.8 mA h g(-1) after 100 cycles at 200 mA g(-1), which is higher than those of the pure macroporous TiO2 electrode (144.8 mA h g(-1)), C-TiO2 composite electrode without macroporous structure (128 mA h g(-1)) and most of the TiO2 based electrodes in the literature. Importantly, the C-TiO2 electrode exhibits a high rate performance and still delivers a high capacity of similar to 440 mA h g(-1) after 1000 cycles at 1000 mA g(-1) (similar to 5.88 C), suggesting good lithium storage properties of the macroporous C-TiO2 composites with high capacity, cycle stability, and rate capability. This work would be instructive for designing hierarchical porous TiO2 based anodes for high-performance LIBs.
Translation or Not:
no
