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Highly Porous Si Nanoframeworks Stabilized in TiO 2 Shells and Enlaced by Graphene Nanoribbons for Superior Lithium‐Ion Storage
Author(s) -
Zhang Xinlin,
Huang Liwu,
Zeng Pan,
Wu Lin,
Zhang Ruixue,
Chen Yungui
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800635
Subject(s) - materials science , lithium (medication) , graphene , chemical engineering , electrochemistry , nanotechnology , electrode , nanoparticle , adsorption , porosity , ion , specific surface area , composite material , catalysis , chemistry , organic chemistry , medicine , endocrinology , engineering
To enhance the rate capability and cycling stability of Si‐based materials in lithium‐ion batteries, three‐dimensional graphene nanoribbons (GNRs) enlacing Si@TiO 2 nanoparticles are synthesized by magnesiothermic reduction, sol‐gel and electrostatic adsorption processes. The rigid clamping layer of TiO 2 on the surface of Si prevents the whole electrode from undergoing volumetric variation. GNRs act as bridges to interconnect the adjacent Si@TiO 2 nanoparticles to form a successively conductive network with decreased inner resistance. Moreover, the effect of two other kinds of carbon resources (polydopamine and resorcinol formaldehyde) on the electrochemical performance of Si@TiO 2 are also discussed. The Si@TiO 2 @GNRs composite shows an enhanced discharge capacity of 1295 mAh g −1 at a current density of 0.5 A g −1 in the 300 th cycle and achieve an outstanding rate capacity of 689.3 mAh g −1 even at 10.0 A g −1 . The design of the double protecting structure provides an alternative strategy to enhance the electrochemical performance of M‐based materials (M=Si, Sn, and Ge).