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A Highly‐Efficient Composite Separator with Strong Ligand Interaction for High‐Temperature Lithium‐Ion Batteries
Author(s) -
Waqas Muhammad,
Tan Chao,
Lv Weiqiang,
Ali Shamshad,
Boateng Bismark,
Chen Wenjin,
Wei Zhaohuan,
Feng Chao,
Ahmed Junaid,
Goodenough John B.,
He Weidong
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800800
Subject(s) - separator (oil production) , composite number , electrolyte , materials science , colloid , chemical engineering , thermal stability , annealing (glass) , ion , ionic conductivity , electrode , adsorption , composite material , chemistry , organic chemistry , thermodynamics , physics , engineering
A PVDF‐HFP/colloidal‐TiO 2 composite separator is synthesized for high‐temperature lithium‐ion batteries. Incorporation of colloidal TiO 2 in the PVDF‐HFP matrix forms a highly‐uniform composite micro‐structure with strong adsorption interactions between TiO 2 and PVDF‐HFP due to the presence of citric acid. The strong interactions are giving rise to advantageous mechanical robustness, separator/electrode interface and electrolyte uptake. The separator shows remarkable stability upon thermal treatment at 150 °C. With a high ionic conductivity up to 1.57×10 −3 S cm −1 , the LFP/Li cell with PVDF‐HFP/colloidal‐TiO 2 composite separator delivers charge‐discharge capacities of 156.95 mAh g −1 (0.1 C) at room temperature and 120.8 mAh g −1 (0.5 C) after annealing cells at 140 °C for 3 hours with a 99 % capacity retention after 100 cycles. The PVDF‐HFP/colloidal‐TiO 2 separator demonstrates promising potentials for practical applications in high‐temperature environments.