리튬이차전지 양극재인 유기라디칼 고분자의 산화법에 대한 연구

An organic radical polymer (ORP) was prepared by radical polymerization and following oxidation into nitroxyl radical. Two different oxidation methods were employed and their radical concentrations were measured using electroparamagnetic resonance spectroscopy (EPR) and UV-visible absorption (UV-vis...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Porrimer (Seṅur) 2014, Vol.38 (6), p.827-831
Hauptverfasser: 이일복(Il Bok Lee), 김영훈(Young Hoon Kim), 문지연(Ji Yeon Moon), 이철위(Chul Wee Lee), 김다은(Da Eun Kim), 하경수(Kyoung Su Ha), 이동현(Dong Hyun Lee), 손형빈(Hyung Bin Son), 윤성훈(Song Hun Yoon)
Format: Artikel
Sprache:kor
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:An organic radical polymer (ORP) was prepared by radical polymerization and following oxidation into nitroxyl radical. Two different oxidation methods were employed and their radical concentrations were measured using electroparamagnetic resonance spectroscopy (EPR) and UV-visible absorption (UV-vis) spectroscopy. From these measurements, $H_2O_2-Na_2WO_4$ oxidation method exhibited a complete oxidation, which resulted in 97.6% spin concentration. Also, it was revealed that convenient and cheap UV-vis measurement was useful for preliminary radical concentration comparison. After applied as a cathode material in lithium ion batteries, ORP electrode showed a high initial capacity ($110mAh\;g^{-1}$), a good initial efficiency (96%), a very high rate performance (70% charging during 1.2 min) and stable cycle performance. 라디칼 고분자화 반응 후 산화법을 이용하여 나이트록실 라디칼 고분자를 제조하였다. 두 가지 방법으로 산화된 라디칼 고분자의 라디칼 농도를 electroparamagnetic resonance spectroscopy(EPR) 법과 UV-visible absorption (UV-vis) 방법을 통하여 측정하고 이를 통해 과산화수소수-$Na_2WO_4$ 법으로 산화하였을 때 라디칼 농도가 97.6% 정도 높게 얻어짐을 확인하였다. 또한 UV-vis 법은 정량적인 분석이 어려우나 대략적인 라디칼 형성 정도를 평가하는데 유용함을 확인하였다. 제조된 유기라디칼 고분를 리튬이온전지 양극재로 적용한 결과 우수한 용량, 초기효율, 높은 속도 특성을 가짐을 알수 있었다.
ISSN:0379-153X
2234-8077