Abstract
Al2O3/PVFM/Al2O3 trilayer membranes are prepared by means of simple coating of PVA-Al2O3 solution onto both sides of PVFM thin membranes, which is prepared via phase inversion method. The characteristics of the trilayer membranes and gel polymer electrolytes are investigated using FESEM, tensile testing apparatus, thermal shrinkage test, EIS and charge-discharge test. When inorganic Al2O3 particles are used to coat the PVFM membrane, drawbacks associated with gel-type membranes, namely, poor mechanical strength and thermal stability are greatly improved. Lithium ion cell with the Al2O3/PVFM/Al2O3 based GPE matched with LiFePO4 shows excellent electrochemical performance.
Highlights
Many gel polymer electrolytes comprising polymer matrices, plasticizing organic solvents and lithium salts have been intensively studied for applications in rechargeable lithium batteries and other electrochemical devices [1][3]
Gel polymer electrolytes with high ionic conductivity can usually be achieved by adding large amounts of organic solvents, they do not have sufficient mechanical ruggedness to withstand winding and stacking during manufacturing [5]-[7], which may cause internal short-circuiting or lead to thermal runaway [8]
Polyvinyl acetal based gel polymer electrolytes have aroused much interest, Japan SONY [9], Mitsui Chemicals [10] and other companies have applied for patents successively about the polyvinyl acetal based gel polymer lithium
Summary
Many gel polymer electrolytes comprising polymer matrices, plasticizing organic solvents and lithium salts have been intensively studied for applications in rechargeable lithium batteries and other electrochemical devices [1][3]. Gel polymer electrolytes with high ionic conductivity can usually be achieved by adding large amounts of organic solvents, they do not have sufficient mechanical ruggedness to withstand winding and stacking during manufacturing [5]-[7], which may cause internal short-circuiting or lead to thermal runaway [8]. A novel trilayer membrane is prepared with a PVFM layer coated with PVA-Al2O3 solution onto both sides to obtain the synergistic effects from each layer This unique approach to the manufacture of trilayer membrane overcomes the drawbacks of gel-type membranes, that include poor mechanical strength and thermal stability in the electrolyte saturation state. The PVFM polymer membrane was coated by PVA-Al2O3 solution and dried under vacuum at 25 ̊C for 24 h
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