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Facile Preparation and Lithium Storage Properties of TiO 2 @Graphene Composite Electrodes with Low Carbon Content
Author(s) -
Guo Shengqi,
Zhen Mengmeng,
Liu Lu,
Yuan Zhihao
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201602532
Subject(s) - graphene , materials science , anode , composite number , lithium (medication) , electrode , battery (electricity) , carbon fibers , lithium ion battery , chemical engineering , energy storage , nanotechnology , composite material , chemistry , power (physics) , physics , quantum mechanics , endocrinology , engineering , medicine
Over the past decade, TiO 2 /graphene composites as electrodes for lithium ion batteries have attracted a great deal of attention for reasons of safety and environmental friendliness. However, most of the TiO 2 /graphene electrodes have large graphene content (9–40 %), which is bound to increase the cost of the battery. Logically, reducing the amount of graphene is a necessary part to achieve a green battery. The synthesis of TiO 2 nanosheets under solvothermal conditions without additives is now demonstrated. Through mechanical mixing TiO 2 nanosheets with different amount of reduced graphene (rGO), a series of TiO 2 @graphene composites was prepared with low graphene content (rGO content 1, 2, 3, and 5 wt %). When these composites were evaluated as anodes for lithium ion batteries, it was found that TiO 2 +3 wt % rGO manifested excellent cycling stability and a high specific capacity (243.7 mAh g −1 at 1 C; 1 C=167.5 mA g −1 ), and demonstrated superior high‐rate discharge/charge capability at 20 C.