Characterization and Electrochemical Performance of Ni-based Cathode materials Coated with Conducting Polymer for Lithium Secondary Batteries

Title
Characterization and Electrochemical Performance of Ni-based Cathode materials Coated with Conducting Polymer for Lithium Secondary Batteries
Authors
김동현장원영조병원윤원섭김광범정경윤
Keywords
Ni-based cathode; polymer coating
Issue Date
2012-04
Publisher
10th Spring Meeting of the International Society of Electrochemistry
Citation
, 255-255
Abstract
Lithium secondary batteries have been intensively studied for application in electric vehicles (PHEVs & EVs) because of their high-power and energy densities. Ni-based cathode materials have been considered as a promising alternative for conventional LiCoO2 cathodes for lithium secondary batteries because of lower cost and higher initial capacity of approximately 200 mAhg-1. However, greater capacity fading during cycling and worse thermal stability of the material has inhibited its commercialization. One of the possible reasons that induced these drawbacks is related to oxygen release from the highly delithiated Li1-δ[Ni1-xMx]O2 host structure, which can lead to a severe thermal runaway with explosion. Another factor that may contribute to the capacity fading and thermal instability is unwanted reaction between the electrode and electrolytes, especially in the Ni-based cathode materials. In order to improve the electrochemical and thermal properties of Ni-based cathode materials, treatment of doping and surface modification has been expected to alleviate the capacity fading and improve thermal stability of the cathode material. To achieve this effect, we prepared Ni-based cathode materials and coated with conducting polymers. The coating with conducting polymer protect the cathode materials from unwanted reaction with electrolyte during cycling and contributes to improved structural, electrochemical properties, and thermal properties with the cathode at the highly delithiated state. Conducting polymers such as polythiophene, polyaniline, and polypyrrole have been the subject of much interest, not only from a fundamental scientific interest viewpoint but also from a practical viewpoint for various functional applications because of their good thermal and chemical stability.
URI
http://pubs.kist.re.kr/handle/201004/42794
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KIST Publication > Conference Paper
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