Synthesis and Electrochemical Characterization of Surface Modified LiNi0.8Co0.15Al0.05O2 Cathode by Conducting Polymer for Lithium Secondary Batteries

Title
Synthesis and Electrochemical Characterization of Surface Modified LiNi0.8Co0.15Al0.05O2 Cathode by Conducting Polymer for Lithium Secondary Batteries
Authors
김동현김광범장원영조병원정경윤
Keywords
LiNi0.8Co0.15Al0.05O2; Conducting Polymer; Lithium Secondary Batteries
Issue Date
2012-05
Publisher
2012 한국 수소 및 신에너지학회 춘계학술대회 논문집
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 toxicity, lower cost and higher initial capacity of approximately 200mAhg-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 partially disorder cationic distribution at the Li site. Partial substitution for nickel by a transition metal(Co,Mn) or a non-transition metal(Al,Mg) is expected to improve the stability of two dimensional layered structures thus resulting in the improved capacity fading upon cycling and stability. An other factor that may contribute to the capacity fading and thermal instability is unwanted reaction between the electrode and electrolytes, especially in the Ni-rich cathode materials like LiNiO2. Simultaneous treatment of doping and surface modification is expected to alleviate the capacity fading and improve thermal stability of the cathode material. To achieve this effect, we prepared LiNi0.8Co0.15Al0.05O2 cathode by sol-gel method and modified the surface with conducting polymer. The effect of conducting polymer layer on LiNi0.8Co0.15Al0.05O2 particles were evaluated utilizing by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The details will be discussed at the meeting.
URI
http://pubs.kist.re.kr/handle/201004/42960
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KIST Publication > Conference Paper
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