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  • Title: Surface Modification of Li-Rich Cathode Materials for Lithium-Ion Batteries with a PEDOT:PSS Conducting Polymer.
    Author: Wu F, Liu J, Li L, Zhang X, Luo R, Ye Y, Chen R.
    Journal: ACS Appl Mater Interfaces; 2016 Sep 07; 8(35):23095-104. PubMed ID: 27541695.
    Abstract:
    UNLABELLED: Composites of lithium-rich Li1.2Ni0.2Mn0.6O2 and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) ( PEDOT: PSS) are synthesized through coprecipitation followed by a wet coating method. In the resulting samples, the amorphous conductive polymer films on the surface of the Li1.2Ni0.2Mn0.6O2 particles are 5-20 nm thick. The electrochemical properties of Li1.2Ni0.2Mn0.6O2 are obviously enhanced after PEDOT: PSS coating. The composite sample with an optimal 3 wt % coating exhibits rate capability and cycling properties that are better than those of Li1.2Ni0.2Mn0.6O2, with an excellent initial discharge capacity of 286.5 mA h g(-1) at a current density of 0.1 C and a discharge capacity that remained at 146.9 mA h g(-1) at 1 C after 100 cycles. The improved performances are ascribed to the high conductivity of the PEDOT: PSS coating layer, which can improve the conductivity of the composite material. The PEDOT: PSS layer also suppresses the formation and growth of a solid electrolyte interface. Surface modification with PEDOT: PSS is a feasible approach for improving the comprehensive properties of cathode materials.
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