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Metal‐Organic Framework Derived Ge/TiO 2 @C Nanotablets as High‐Performance Anode for Lithium‐Ion Batteries
Author(s) -
Yao Tianhao,
Wang Hongkang,
Wang Jinkai,
Liu Ting,
Li Chao,
Han Xiaogang,
Cheng Yonghong
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902833
Subject(s) - anode , materials science , thermal diffusivity , lithium (medication) , electrochemistry , germanium , conductivity , chemical engineering , annealing (glass) , diffusion , nanocomposite , metal , intercalation (chemistry) , nanotechnology , inorganic chemistry , electrode , composite material , metallurgy , chemistry , silicon , thermodynamics , medicine , physics , engineering , endocrinology
Titanium dioxide (TiO 2 ) is a promising anode for lithium‐ion batteries (LIBs) due to its long lifespan and high rate capability, arising from its excellent structural stability upon lithium intercalation‐deintercalation, but suffers from low conductivity and diffusivity. In contrast, germanium (Ge) possesses high specific theoretical capacity (1600 mA h g −1 ) as well as high electrical conductivity and high Li + diffusivity, but the large volume changes upon cycling and the high price still impede its practical application. Herein, with the objective to overcome the drawbacks of TiO 2 ‐based anode materials, Ge/TiO 2 @C nanotablets with a small amount of Ge content are successfully prepared by annealing C 4 H 12 GeO 4 /MIL‐125 mixtures in Ar/H 2 atmosphere. Benefiting from the well‐dispersion of Ge nanoparticles within the TiO 2 @C matrices, the composites exhibit superior electrochemical performance when examined as a LIB anode material, delivering high reversible capacities of 502/258 mA h g −1 after 200/500 cycles at current densities of 200/500 mA g −1 , respectively. Notably, the Ge/TiO 2 @C shows enhanced surface/pore features and demonstrates improved conductivity, lithium diffusion and specific capacities, owing to the introduction of Ge component.