Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 35, Pages 23095-23104Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07431
Keywords
lithium-ion battery; cathode material; surface modification; PEDOT:PSS; electrochemical properties
Funding
- National Science Foundation of China [U1564206]
- Chinese National 973 Program [2015CB251106]
- Major achievements Transformation Project for Central University in Beijing
- Beijing Science and Technology Project [D151100003015001]
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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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