Journal
IONICS
Volume 23, Issue 12, Pages 3365-3375Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-017-2130-x
Keywords
Lithium-ion batteries; Gel polymer electrolyte; Structural analysis; Ionic conductivity; Charge-discharge performance
Funding
- International S&T Cooperation Program of China [2014DFA53020]
- Guangdong Innovative and Entrepreneurial Research Team Program [2013C099]
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Based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) and lithium tetrafluoroborate (LiBF4) salt along with blending plasticizers, ethylene carbonate (EC) and propylene carbonate (PC), high Li-ion-conducting gel polymer electrolyte films are developed. Their properties are characterized by various techniques. The ambient temperature ionic conductivity of the 85PVdF-HFP:15LiBF(4) + 150(EC + PC) electrolyte film has a high value of 8.1 x 10(-4) S cm(-1). Its crystallinity, melting point, and electrochemical stability window are 9.5%, 115 A degrees C, and 4.6 V, respectively. The mechanical testing shows that the Young's modulus, yield strength, and breaking strain of this electrolyte film are 36.8 MPa, 3.4 MPa, and 320%, respectively. Lithium-ion batteries based on the gel polymer electrolyte film exhibit remarkable charge-discharge and cycling performances. The initial discharge capacity of this battery is as high as 165.1 mAh g(-1) at 0.1 C and just shows a small capacity fading of 4.8% after 120 cycles, indicating that the 85PVdF-HFP:15LiBF(4) + 150(EC + PC) system is an excellent electrolyte candidate for lithium-ion battery applications. The charge-discharge performance of the Li-ion cell fabricated with this gel polymer electrolyte film is apparently better than that of the previously reported Li-ion cells fabricated with other PVdF-HFP-based gel polymer electrolyte films.
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