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A Coordination Strategy for Ti x Sn 1– x O 2 Solid Solution Nanocubes Wrapped by Reduced Graphene Oxide as a Candidate for Lithium‐Ion‐Battery Anodes
Author(s) -
Dong Yutao,
Cai Jialin,
Li Yongsheng,
Liu Yushan,
Ding Jie,
Li Dan,
Zhang Jianmin
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.201801165
Subject(s) - graphene , oxide , materials science , lithium (medication) , aqueous solution , ion , electrochemistry , adsorption , anode , chemical engineering , solid solution , hydrothermal circulation , nanotechnology , chemistry , electrode , metallurgy , organic chemistry , medicine , endocrinology , engineering
A series of Ti x Sn 1–x O 2 (0≤x≤1) solid solution nanocubes wrapped by reduced graphene oxide (Ti x Sn 1–x O 2 /rGO, TSGC) were designed and synthesized for the application exploration as anode material in lithium ion batteries. When graphene oxide (GO) and K 2 TiO(C 2 O 4 ) 2 (PTO) were mixed in aqueous ambience, the TiO(C 2 O 4 ) 2 2− ions were not absorbed onto GO surface by the strong electrostatic repulsion force of the similarly negative‐charged surfaces. When Sn 4+ ions were added to the mixture, they were easily adsorbed onto the GO surface. At the same time, Sn 4+ ions were also easily coordinated by the carboxyl groups of the PTO species. After the followed hydrothermal and heat treatments, the desired 3D nanoarchitecture composites were obtained. Interestingly, in this Ti x Sn 1–x O 2 /rGO series, the Ti 0.74 Sn 0.26 O 2 /rGO sample exhibited the highest specific capacity of 514 mA h g −1 at 0.1 A g −1 even after 1000 th cycles (nearly 100 % efficiency). Such promising electrochemical results are attributed to the 3D integrated structure by achieving better electrical contact between the active materials to shorten ion transport pathways, which highlights the synergistic effect from combining the Ti x Sn 1–x O 2 nanocubes and rGO films. Additionally, the lithium storage mechanism of the as‐prepared Ti x Sn 1–x O 2 /rGO has been studied via in‐situ X‐ray diffraction (XRD) measurements for the first time.