Characterization and Electrochemical Performance of Ni-based Cathode materials Coated with Conducting Polymer for Lithium Secondary Batteries
- Characterization and Electrochemical Performance of Ni-based Cathode materials Coated with Conducting Polymer for Lithium Secondary Batteries
- 김동현; 장원영; 조병원; 윤원섭; 김광범; 정경윤
- Ni-based cathode; polymer coating
- Issue Date
- 10th Spring Meeting of the International Society of Electrochemistry
- , 255-255
- 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.
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