Citation: CUI Wen-Yu, AN Mao-Zhong, YANG Pei-Xia, ZHANG Jin-Qiu. Cathodic and Thermal Stabilities of the P(VdF-HFP)-Based Ionic Liquid Composite Polymer Electrolyte[J]. Acta Physico-Chimica Sinica, ;2011, 27(01): 78-84. doi: 10.3866/PKU.WHXB20110112 shu

Cathodic and Thermal Stabilities of the P(VdF-HFP)-Based Ionic Liquid Composite Polymer Electrolyte

1.
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, P. R. China

Received Date: 20 September 2010
Available Online: 25 November 2010
Fund Project: 黑龙江省自然科学基金(B2007-05)资助项目 (B2007-05)

We report on a composite polymer electrolyte containing the ionic liquid 1-ethyl-3- methylimidazolium hexafluorophosphate (EMIPF₆). This composite polymer electrolyte is based on the poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-HFP)) polymer matrix and is a potential electrolyte for use in lithium ion batteries. The ionic conductivity of the composite polymer electrolyte was measured by electrochemical impedance spectroscopy (EIS). Linear sweep voltammetry (LSV) was performed to investigate the electrochemical stability window of the polymer electrolyte. The thermal properties for the composite polymer electrolyte were also characterized by thermogravimetry (TG) and by a flammability test. The results show that the presence of the EMIPF₆ ionic liquid increases the ion transport properties greatly but a better cathodic stability is only obtained by the addition of organic additives such as ethylene carbonate-propylene carbonate (EC-PC), which extends the cathodic stability to 0.3 V. This corresponds to an electrochemical stability window of 0.3-4.3 V. The selected Li₄Ti₅O₁₂ anode and LiCoO₂ cathode materials exhibit acceptable electrochemical performance in combination with the prepared P(VdF-HFP)/ LiPF₆/EMIPF₆/EC-PC composite polymer electrolyte. At a charge-discharge rate of 0.1C, Li/LiCoO₂ and Li/ Li₄Ti₅O₁₂ have reversible capacities of 130 and 144 mAh·g^-1, respectively. However, the corresponding thermal performance is suppressed because of the presence of organic additives.
- Lithium ion battery,
- Ionic liquid,
- Composite polymer electrolyte,
- Cathodic stability,
- Thermal stability
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