Premium
Electron Bottleneck in the Charge/Discharge Mechanism of Lithium Titanates for Batteries
Author(s) -
Ventosa Edgar,
Skoumal Marcel,
Vazquez Francisco Javier,
Flox Cristina,
Arbiol Jordi,
Morante Joan Ramon
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500349
Subject(s) - overpotential , anode , materials science , electrode , electrical conductor , lithium (medication) , energy storage , chemical engineering , battery (electricity) , bottleneck , ionic bonding , optoelectronics , nanotechnology , ion , composite material , chemistry , electrochemistry , computer science , thermodynamics , medicine , power (physics) , physics , organic chemistry , engineering , embedded system , endocrinology
The semi‐solid flow battery (SSFB) is a promising storage energy technology featured by employing semi‐solid fluid electrodes containing conductive additive and active Li‐ion battery materials. The state of art anode material for SSFB is Li 4 Ti 5 O 12 (LTO). This work shows that LTO improves drastically the performance in fluid electrode via hydrogen annealing manifesting the importance of the electrical conductivity of the active material in SSFBs. On the other hand, the properties of fluid electrodes allow the contributions of ionic and electrical resistance to be separated in operando. The asymmetric overpotential observed in Li 4 Ti 5 O 12 and TiO 2 is proposed to originate from the so‐called electron bottleneck mechanism based on the transformation from electrically insulator to conductor upon (de‐)lithiation, or vice versa, which should be considered when modelling, evaluating or designing advanced materials based on Li 4 Ti 5 O 12 , TiO 2 or others with insulating‐conducting behavior materials.