Characteristics of Conducting Polymer-Coated Nanosized LiFePO4 Cathode in the Li+ Batteries

Title
Characteristics of Conducting Polymer-Coated Nanosized LiFePO4 Cathode in the Li+ Batteries
Authors
Hung-Cuong Dinh여인형조원일모선일
Keywords
cathode; LiFePO4; nanosize; conducting polymer; coating
Issue Date
2010-08
Publisher
ECS transactions
Citation
VOL 28, NO 8, 179-186
Abstract
Both nano-sized and micron-sized LiFePO4 crystalline particles with rhombus structure were synthesized by a hydrothermal method for the cathode materials. Coating conductive polymers, such as polypyrrole (PPy) and poly-3,4-ethylenedioxythiophene (PEDOT), on the surfaces of LiFePO4 particles improved the battery capacities by increasing the ionic and electric conductivities of the cathode materials. The nano-sized LiFePO4 coated with PEDOT shows the largest specific capacity (167 mAhg-1 for initial to 158 mAhg-1 after 50 cycles), compared to the cases coated with PPy (165 mAhg-1 to 127 mAhg-1) and with carbon (152 mAhg-1 to 147 mAhg-1). Compared to the nano-sized particles, the micron-sized particles have much smaller surface-tovolume ratios, which resulted in increased diffusion distance requirements for lithium ions and, also, reduced accessibility of lithium ions.
URI
http://pubs.kist.re.kr/handle/201004/38122
ISSN
1938-5862
Appears in Collections:
KIST Publication > Article
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