Blended polymer electrolytes based on poly(Lithium 4-styrenesulfonate)for the rechargeable Lithium polymer batteries

Abstract

Development of portable electronic devices has been remarkable in the last decade. High performance batteries withhigh energy density are indispensable for further development of the portable electronic equipments. A Lithium secondary battery using solid polymer electrolyte is an attractive energy source for the portable devices, since the use of solid polymer electrolyte makes the fabrication of safe batteries possible and permits the development of thin batteries with design flexibility. In the conventional electrolytes, when current flows into the electrolyte, both the anions and cations are mobile the other side, which have a salt concentration gradient and polarization. It implies further ionic movement and thus increases resistance of electrolyte [1]. Also, electrochemical stability can be limited by and irreversible oxidation of the salt anion attacking the hydrogen of the polymer. In order to increase the electrochemical stability and decrease the salt concentration gradient, it is necessary to develop single-ion conductor. A lot of researchers focus on the works for anchoring the anion to the polymer matrix. Our study is for the development of new single ionic conductiong polymer electrolyte systems based on polymer blends. The crystalliation behavior of blended polymer electrolytes consisted of PEO and poly(lithium 4-styrensulfonate) has been studied by mens of differential scanning calorimetry (DSC). The electrochemical stability is evaluated by linear sweep voltammetry.