Robust yarn electrodes for microbatteries with high areal capacity

Title
Robust yarn electrodes for microbatteries with high areal capacity
Authors
강태형박사랑이병선최인석유웅열
Keywords
LiFePo4 cathode; Nanocomposite yarn; Microbattery; Areal capacity
Issue Date
2019-03
Publisher
Materials & design
Citation
VOL 166, NO 15-107620-8
Abstract
This work reports the design strategy of mechanically robust yarn electrodes having high areal capacity (ca. 14  mAh/cm2) as building blocks for microbatteries. Lithium iron phosphate (LiFePO4) was embedded into poly(acrylonitrile) nanofibers (NFs) via electrospinning. The obtained NFs were assembled into yarns via a yarning process, and were then thermally treated to produce carbon NF yarns. A hot-stretching process was used between the yarning and thermal treatment processes, improving the mechanical (tensile modulus of 1.03  GPa and strength of 38  MPa) and electrical (43.1  S/cm) properties of the yarn electrodes. The free-standing yarn electrodes with different mass loadings showed stable cycling performances with reasonable reversible capacity (ca. 112  mAh/g) up to 30  cycles. These mechanically robust and electrochemically excellent yarn electrodes could serve as building blocks for various structures in advanced microbatteries requiring high areal density.
URI
http://pubs.kist.re.kr/handle/201004/69598
ISSN
0264-1275
Appears in Collections:
KIST Publication > Article
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