Self-assembled TiO2-graphene hybrid nanostructures for enhanced Li-ion insertion.
We used anionic sulfate surfactants to assist the stabilization of graphene in aqueous solutions and facilitate the self-assembly of in situ grown nanocrystalline TiO2, rutile and anatase, with graphene. These nanostructured TiO2-graphene hybrid materials were used for investigation of Li-ion insertion properties. The hybrid materials showed significantly enhanced Li-ion insertion/extraction in TiO2. The specific capacity was more than doubled at high charge rates, as compared with the pure TiO2 phase. The improved capacity at high charge-discharge rate may be attributed to increased electrode conductivity in the presence of a percolated graphene network embedded into the metal oxide electrodes.
Wang
Donghai
D
Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Choi
Daiwon
D
Li
Juan
J
Yang
Zhenguo
Z
Nie
Zimin
Z
Kou
Rong
R
Hu
Dehong
D
Wang
Chongmin
C
Saraf
Laxmikant V
LV
Zhang
Jiguang
J
Aksay
Ilhan A
IA
Liu
Jun
J