Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 4, Pages 2546-2552Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am404965p
Keywords
conductive polymer; surface modification; LiNi0.6Co0.2Mn0.2O2; protective coating; cycling performance
Funding
- Hyundai Motor Company
- Fundamental R&D Program for Core Technology of Materials
- Human Resources Development Program of KETEP [20124010203290]
- Korean government Ministry of Trade, Industry and Energy
- Korea Evaluation Institute of Industrial Technology (KEIT) [20124010203290] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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LiNi0.6Co0.2Mn0.2O2 cathode materials were surface-modified by coating with a dual conductive poly(3,4-ethylenedioxythiophene)-co-poly(ethylene glycol) (PEDOT-co-PEG) copolymer, and their resulting electrochemical properties were investigated. The surface-modified LiNi0.6Co0.2Mn0.2O2 cathode material exhibited a high discharge capacity and good high rate performance due to enhanced transport of Li+ ions as well as electrons. The presence of a protective conducting polymer layer formed on the cathode also suppressed the growth of a resistive layer and inhibited the dissolution of transition metals from the active cathode materials, which resulted in more stable cycling characteristics than the pristine LiNi0.6Co0.2Mn0.2O2 cathode material at 55 degrees C.
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