Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 444, Issue -, Pages 213-222Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2013.05.028
Keywords
Thermally induced phase separation; PVDF/PMMA blend membrane; Polymer electrolytes; Lithium ion batteries
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Funding
- National Nature Foundation of China [51003074, 21206132]
- SA/CHINA Agreement on Cooperation on Science and Technology [2010DF51090]
- National Program on Key Basic Research Project of China [2011CB612311]
- Commonweal Project of China National Ocean Bureau [201105025]
- Tianjin Research Program of Applied Basic & Cutting-edge Technologies [09JCYBJC27200]
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PVDF/PMMA blend microporous membranes were fabricated via thermally induced phase separation (TIPS) process using a single diluent. Then the blend membranes were soaked in a liquid electrolyte to form polymer electrolytes. Finally, the polymer electrolytes were assembled in coin cells to test electrochemical properties. The effects of PMMA/PVDF weight ratio on the phase diagram of PVDF/PMMA/diluent system, morphology, crystallinity, crystal structure, mechanical properties and porosity of the membranes were discussed. The electrochemical properties of corresponding polymer electrolytes, such as ionic conductivity, cell charge-discharge capacity and discharge performance at different current densities, electrochemical stability windows, were also investigated in this paper. It was found that the cloud point of the system decreased and the membrane morphology changed from cellular structure to network structure with an increase in the amount of PMMA. Both electrolyte uptake of blend membranes and ionic conductivity of corresponding polymer electrolytes also increased with an increase in the amount of PMMA. The maximum ionic conductivity was found to reach 3.38 x 10(-3) S/cm at 25 degrees C. The graphite/polymer electrolyte/LiFePO4 cells of blend membranes showed higher charge-discharge capacity and better discharge performance at different current densities. Electrochemical stability window was stable up to 4.7 V (vs. Li+/Li). (C) 2013 Elsevier B.V. All rights reserved.
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