摘要
A new positive-temperature-coefficient(PTC) material was prepared simply by blending of conductive Super P carbon black(CB) with insulating poly(methyl methacrylate)(PMMA) polymer matrix,which was empolyed as a coating layer on the aluminium foil substrate to fabricate a sandwiched Al/PTC/LiCoO2 cathode.The experimental results from cyclic voltammetry,charge-discharge measurements and impedance spectroscopy demonstrated that the PTC electrode has a normal electrochemical performance at ambient temperature,but shows an enormous increase in the resistance at the temperature range of 80?120℃.This PTC behavior greatly restrains the reaction current passing through the electrode at elevated temperatures,capable of acting as a self-actuating safety mechanism to prevent the battery from thermal runaway.
A new positive-temperature-coefficient （PTC） material was prepared simply by blending of conductive Super P carbon black （CB） with insulating poly（methyl methacrylate） （PMMA） polymer matrix, which was empolyed as a coating layer on the aluminium foil substrate to fabricate a sandwiched AI/PTC/LiCoO2 cathode. The experimental results from cyclic voltammetry, charge-discharge measurements and impedance spectroscopy demonstrated that the PTC electrode has a normal electrochemical performance at ambient temperature, but shows an enormous increase in the resistance at the temperature range of 80-120℃. This PTC behavior greatly restrains the reaction current passing through the electrode at elevated temperatures, capable of acting as a self-actuating safety mechanism to prevent the battery from thermal runaway.
基金
supported by the National Basic Research Program of China (2009CB220100)
the National High-tech R&D Program of China (2011AA11A256 and 2011AA11A254)
the Fundamental Research Funds for the Central University
