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Cesium-doped graphene grown in situ with ultra-small TiO2 nanoparticles for high-performance lithium-ion batteries
Lu, Xiaoyu1; Xie, Xiaofeng; Luo, Jianqiang; Sun, Jing
2017
发表期刊NEW JOURNAL OF CHEMISTRY
ISSN1144-0546
卷号41期号:16页码:7938
摘要For applications of lithium-ion batteries (LIBs), to improve the electronic conductivity and the electrochemical kinetics of the electrode material, a novel composite of ultra-small TiO2 nanoparticles grown in situ on cesium-doped reduced graphene oxide was prepared. The ultra-small TiO2 nanoparticles (similar to 7 nm), which were obtained by refluxing in anhydrous ethanol, were evenly distributed on the graphene surface, endowing high reactivity with Li+. In particular, doping of graphene with Cs was proposed and was performed in the electrode material of LIBs by a facile method. The electron-doping effect of graphene was proved to increase the electronic conductivity of the composite. Benefiting from these properties, a Cs-doped rGO/TiO2 (CsGT) electrode displayed good cyclability and particularly outstanding rate capability. The CsGT electrode exhibited a capacity of 163 mA h g(-1) at 0.4C after 100 cycles, as well as a capacity of 109 mA h g(-1) with a retention of 55.4% when the current density was increased to 20C, which was much better than the performance of control samples. At a current density of 40C, the CsGT electrode exhibited a highly reversible capacity of 70 mA h g(-1) after 1000 cycles. The superiority of doping with Cs in comparison with calcination under a reducing atmosphere is carefully discussed via detailed characterization and electrochemical impedance spectroscopy (EIS) analysis.
DOI10.1039/c7nj01251a
WOS记录号WOS:000407304100016
EI入藏号1369-9261
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/26654
专题中国科学院上海硅酸盐研究所
作者单位1.Chinese Acad Sci, State Key Lab High Performance Ceram & Superfine, Shanghai Inst Ceram, 1295 Ding Xi Rd, Shanghai 200050, Peoples R China
2.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
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GB/T 7714
Lu, Xiaoyu,Xie, Xiaofeng,Luo, Jianqiang,et al. Cesium-doped graphene grown in situ with ultra-small TiO2 nanoparticles for high-performance lithium-ion batteries[J]. NEW JOURNAL OF CHEMISTRY,2017,41(16):7938.
APA Lu, Xiaoyu,Xie, Xiaofeng,Luo, Jianqiang,&Sun, Jing.(2017).Cesium-doped graphene grown in situ with ultra-small TiO2 nanoparticles for high-performance lithium-ion batteries.NEW JOURNAL OF CHEMISTRY,41(16),7938.
MLA Lu, Xiaoyu,et al."Cesium-doped graphene grown in situ with ultra-small TiO2 nanoparticles for high-performance lithium-ion batteries".NEW JOURNAL OF CHEMISTRY 41.16(2017):7938.
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