High Temperature Resistant Separator of PVDF-HFP/DBP/C-TiO for Lithium-Ion Batteries.

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ID: 84468
2019
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Ranked #120 of 812 articles by views in Materials (Basel, Switzerland)

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Abstract
To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO) composite separator is prepared with the phase inversion method. When the content of TiO nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO (5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO (5%) composite separator has a superior ionic conductivity of 1.26 × 10 S cm and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO composite separator exhibits excellent electrochemical performance under high and room temperature environments.
Reference Key
li2019highmaterials Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Haijuan;Li, Ling;Zheng, Shuaizhi;Wang, Xinming;Ma, Zengsheng;
Journal Materials (Basel, Switzerland)
Year 2019
DOI
E2813
URL
Keywords
ionic conductivity phase inversion pvdf-hfp tio2 nanofiber composite separator thermal shrinkage

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