Study On Preparation And Performance Of P(AN-MMA) Polymer Electrolyte

Polymer lithium-ion batteries ( PLiB) are a novel second rechargeable system based on liquid lithium-ion batery. It not only possesses the advantages of high energy density, long cycle life and friendliness with environment but also has advantages of improved safety and design flexibility in cell dimension compared with the liquid electrolyte Li-ion batteries. The PLB is atractive as power sources for mobile gear including cellular phones, notebook computers and portable audiovisual equipment.Therefore,the demand of polymer electrolyte membraneis increasingthe research of polymer electrolyte have attracted more and more a tentions.A series of composite polymer electrolytes have been prepared by using poly(acrylonitrile-methylmethacrylate) and inorganic oxides nanoparticles as filles.The main study contents were as follows;Firstly, a kind of nanocomposite polymer electrolyte (NCPE) based on poly(acrylonitrile-methyl methacrylate) [P(AN-MMA)] copolymer was prepared by in-situ polymerization of monomers on the surface of TiO2 nanoparticles, which come from the hydrolysis of Ti(OC4H9)4.Then the polymer electrolytes were studied by FTIR and electrochemical measurement. Analysis of FT-IR spectra indicated that acrylonitrile (AN) copolymerized with methyl methacrylate (MMA) monomers by breaking their own double bonds.When the composite polymer electrolytes contain 2wt% of TiO2,it exhibited excellent ionic conductivity up to 0.96×10-3S/cm. Secondly, the micro-porous composite polymer films have been prepared by using P(AN-MMA)/TiO2 and achieved by evporation.Then the polymer electrolytes were studied by SEM,FTIR,DSC and electrochemical measurement.The results show that the TiO2 fillers added in P(AN-MMA) served to decrease Tg of composite polymer electrolyte and improve mechanical measurment.And the temperature dependence of the ionic conductivity of the polymer electrolyte films followed the Arrhenius equation. The P(AN-MMA)/TiO2 polymer electrolyte possesses 1.12×10-3 S·cm-1 of ionic conductivity at room temperature and 0.59 of Li+ ions transference numbers when composite polymer electrolyte contain 10.8% of TiO2.The potential windows of the composite polymer electrolytes was 5.0V(vs. Li+/Li).Then, the electric double-layer capacitors and lithium secondary batteries, applying the obtained P(AN-MMA)/TiO2 composite polymer electrolytes were prepared and tested. And the electric double-layer capacitor exhibited excellent electro-chemical performance,which higher specific capability and better charge and discharge.The lithium ion battery showed better first discharge capacity and charge/discharge cycling.Finally,the P(AN-MMA)/P(VDF-HFP) polymer electrolyte have been prepared by using the phase inversion process.Then the polymer electrolytes were studied by SEM,FTIR and electrochemical measurment.The polymer electrolytes prepared with P(AN-MMA):P(VDF-HFP) mass ratio of 1:1 exhibited excellent ionic conductivity up to 0.97×10-3 S·cm-1 and 0.55 of Li+ ions transference numbers. The potential windows of the polymer electrolytes was 4.5V(vs. Li+/Li)...