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Highly Efficient PVDF‐HFP/Colloidal Alumina Composite Separator for High‐Temperature Lithium‐Ion Batteries
Author(s) -
Ali Shamshad,
Tan Chao,
Waqas Muhammad,
Lv Weiqiang,
Wei Zhaohuan,
Wu Songhao,
Boateng Bismark,
Liu Jingna,
Ahmed Junaid,
Xiong Jie,
Goodenough John B.,
He Weidong
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201701147
Subject(s) - separator (oil production) , materials science , electrolyte , composite number , chemical engineering , colloid , ionic conductivity , polymer , annealing (glass) , composite material , electrode , chemistry , physics , engineering , thermodynamics
Toward high‐temperature lithium‐ion batteries, adding inorganic materials are proposed as an effective strategy. However, inorganic particles tend to aggregate in the polymer matrix, causing degradation in battery performance. Here, a PVDF‐HFP/colloidal Al 2 O 3 composite separator is prepared with a phase inverse method. The colloidal Al 2 O 3 particles well dispersed in the PVDF‐HFP polymer matrix substantially enhance the mechanical strength of the PVDF‐HFP separator. The PVDF‐HFP/colloidal Al 2 O 3 composite separator owns a high electrolyte uptake of 372%, a high ionic conductivity of 1.3 × 10 −3 S cm −1 at 80 °C and delivers high capacity retention of 95.6% after 100 charge–discharge cycles at 0.5 C. In addition, PVDF‐HFP/colloidal Al 2 O 3 separator only has a 4.5% thermal shrinkage at 150 °C and exhibits high electrochemical performances upon annealing at 140 °C.