Preparation and performance of a novel core-shell Gel Polymer Electrolytes
A novel core-shell latex Gel Polymer Electrolytes (GPE) based on poly (methyl methacrylate-acrylonitrile -styrene) (P(MMA-AN-ST)) was prepared for applications in Li-ion batteries. The structure and the performance of the polymer and the GPE were characterized with FTIR, DSC/TG, TEM, SEM, LSV and CA. It is shown that the copolymer has a high thermal stability up to 320°C and the porous structure of the membrane was formed effectively. As-prepared gel polymer electrolytes exhibits a high ionic conductivity of 3.52×10−3 Scm−1 at 25°C and it is electrochemically stable up to 5.2V (vs. Li). This novel GPE can be potentially applied to the manufacture of PLBs.
Electrochemical characterization of poly(ethylene-co-methyl acrylate)-based gel polymer electrolytes for lithium-ion polymer batteries
Abstract Gel polymer electrolytes (GPE) composed of poly(ethylene- co -methyl acrylate) copolymer, LiBF 4 -EC/EMC/PC, and silanized fumed silica are prepared. The ionic conductivity reaches 5.8×10 −4 S cm −1 in the GPE containing 22% poly(ethylene- co -methyl acrylate), 65% LiBF 4 -EC/EMC/PC and 13% silanized fumed silica at room temperature. GPEs are free-standing films and are used to prepare thin films for rechargeable lithium-ion polymer cells. Lithium-ion polymer cells, which consist of mesophase carbon fibre anode, poly(ethylene- co -methyl acrylate)-based GPE and LiCoO 2 cathode, are assembled, and their charge–discharge cycling characteristics are investigated.
Stability results for the solutions of some third and fourth order differential equations
SummaryThe paper investigates conditions under which solutions of the equations (1) and (2) of § 1.1 tend to zero as t → ∞.