Surface Modification of Li-Rich Cathode Materials for Lithium-Ion Batteries with a PEDOT:PSS Conducting Polymer

Feng Wu; Jianrui Liu; Li Li; Xiaoxiao Zhang; Rui Luo; Yusheng Ye; Renjie Chen

doi:10.1021/acsami.6b07431

Surface Modification of Li-Rich Cathode Materials for Lithium-Ion Batteries with a PEDOT:PSS Conducting Polymer

ACS Appl Mater Interfaces. 2016 Sep 7;8(35):23095-104. doi: 10.1021/acsami.6b07431. Epub 2016 Aug 29.

Authors

Feng Wu^{1

2}, Jianrui Liu¹, Li Li^{1

2}, Xiaoxiao Zhang¹, Rui Luo¹, Yusheng Ye¹, Renjie Chen^{1

2}

Affiliations

¹ School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
² Collaborative Innovation Center of Electric Vehicles in Beijing , Beijing 100081, China.

PMID: 27541695
DOI: 10.1021/acsami.6b07431

Abstract

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.

Keywords: PEDOT:PSS; cathode material; electrochemical properties; lithium-ion battery; surface modification.