.peo / Pani Preparation Of Conductive Binder In Lithium-ion Battery Applications

To solve the problem of PVDF binder in Lithium ion batteries, Weprepared the PEO/PAni composites as binder by the method of in situ, thePEO/PAni composites are conductive and a kind of non- fluorin polymer.FT-IR, SEM, TG and A.C. impedance spectroscopy were investigated toshow the morphology, thermal performance, electronic and ionicconductivity of the PEO/PAni binder. The influence of reactive conditionswere studied and the best conditions were speculated.The results of FT-IR and SEM show that the An monomer ISpolymerized and the PAni particles are dispersed uniformly in PEOmatrix, there is observable effect between the O atoms on the PEO chainsand the N-H on the PAni chains, PEO matrix is packed uniformly on thePAni particles. TG results show that the binder has a good thermalstability below 250^C. The results of conductivity show that reactive timeand temperature have more remarkable influence, when the time is 5hours, the temperature is 30^C and the content of PAni is between50～60％, the PEO/PAni composites have a good conductivity.The results of the performance of the binder show that the PEO/PAnibinder has a good adhesive capability. Comparing with the species andcontent of conductive agents, the binder has a better conductivity whenthe content of carbon is between 5～6％.The PEO/PAni binder were applied to fabricate the lithium ionbatteries. We investigated the first charge-discharge capacity, cyclingperformance and discharge curves at different current of the batteries. Theresults show the batteries with PEO/PAni binder have more highercapcacity than the PVDF's at same conditions, the batteries's initialdischarge capacity is 158mAh·g^-1. The capacity decreases as the dischargecurrent increases. Reducing the content of conductive agent, the capacityis equal to the PVDF's. The capacity decreases without conductive agent.