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Investigation the sodium storage kinetics of H 1.07 Ti 1.73 O 4 @rGO composites for high rate and long cycle performance
Author(s) -
Hou Lijuan,
Xu Tingting,
Liu Ruichao,
Yuan Huiyu,
Kong Dezhi,
Shen Weixia,
Zang Jinhao,
Li Xinjian,
Wang Ye
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17575
Subject(s) - anode , materials science , ion , composite number , transmission electron microscopy , diffusion , composite material , sodium , kinetics , hydrothermal circulation , chemical engineering , electrode , nanotechnology , chemistry , metallurgy , physics , organic chemistry , quantum mechanics , engineering , thermodynamics
Insertion type material has been attracted plenty of attentions as the anode of sodium ion batteries (SIBs) due to the low volume change induced long cycle stability. H 1.07 Ti 1.73 O 4 (HTO), a two‐dimensional layered material, is a new insertion type anode material for SIBs reported in this study. Layered HTO composites were decorated with rGO nanosheets via an electrostatic assembly method followed by hydrothermal treatment. When adapted as the anode material of SIBs, HTO@rGO composite exhibits an enhanced sodium ion storage behavior, including high rate capability and long cycle stability. It can deliver high capacities of 142.8 and 66.7 mA h g −1 at 100 and 10 000 mA g −1 , respectively. Moreover, it can keep a capacity of 75.1 mA h g −1 at 5 A g −1 after even 5000 cycles, corresponding to a high capacity retention of 70.8% (0.0058% capacity decay per cycle). HTO exhibits a small volume expansion of 19.6% by in‐situ transmission electron microscopy (in‐situ TEM). The diffusion coefficient of sodium ions is increased from 1.77 × 10 −14 cm 2 s −1 in HTO composites to 4.80 × 10 −14 cm 2 s −1 in HTO@rGO composites. Our designed and synthesized HTO@rGO provides a new route for high rate and long cycle stable SIBs anode materials.