Polymer Electrolytes Using Several New Kinds Of Li Salts For Li-Ion Batteries

PEO-based polymer electrolytes have been studied extensively as all-solid polymer electrolytes. However, there are still problems such as low ionic conductivity and poor compatibility of the PEO based solid polymer electrolytes, which seriously hindered its application. In this paper,the influence factors such askinds of Li-salts/namo additives and contents of namo additives have been studied.The impedance properties of the polymer electrolytes were characterized by AC-impedance-spectrascopy.The-function,structure,thermodynamic-properties,surfac e-morphology of the PEO-based polymer electrolytes were characterized by SEM,DSC,TG and XRD-diffraction.1:In this paper.different kinds of Li salts have been used to prepare polymer electrolytes with the same martix of PEO. Using a novel lithium salt LBDOB, which having a large anion as an electrolytes salt instead of the conventional lithium salts added to the PEO matrix to prepare polymer electrolytes. The morphologies were characterized by scanning electron microscopy(SEM). The ionic conductive of these polymer electrolytes were studied by AC-impedance Spectrascopy. Rb of polymer electrolytes with the new lithium membrane salt LBDOB were closed to the polymer electrolytes using LiPF6. LBDOB could alternative LiPF6 and used in the polymer electrolytes as an electrolytes lithium salt.2:ZnO were used as the namo additives to improve the performance of PEO-base solid-polymer-electrolytes.the effect of the ZnO for the polymer electrolytes were discussed. Properties of the polymer electrolytes were characted by SEM, XRD, TG, DSC. AC-impedance meansurements were carried out to calculate the ionic conductivity of the polymer electrolytes. The crystallinity of PEO-base polymer electrolyties were decreased with the addicted of ZnO. The ionic conductive of PEO-based polymer electrolyties were improved. The Rb of polymer electrolytes at room temperature with the increasing of ZnO content first decreases and then increases. Reaches a minimum at 10% ZnO contents,which is about 2KΩ. The Rb of polymer electrolytes increasing when the ZnO content exceeds 10%, This phenomenon may be due to the concentration of ZnO is too large, hindering the transport of lithium ions.3:The effect of different namo additives on the ionic conductive, morphologies, crystallinity and microstructure of the PEO-based polymer electrolytes were studied by X-ray diffraction, SEM, AC-impedance Spectrascopy. Adding other different kinds of nanoparticles and nano ZnO particles can also effectively reduce the crystallinity of the polymer electrolytes, reducing the Rb of the polymer electrolytes at room temperature, increasing the ionic conductivity. The polymer electrolytes modified by different nanoparticles have similar performance. Adding different types of nanoparticles can also effectively improve the mechanical properties of the polymer electrolyte.