KLI

Study of fluorine substitution effect at oxygen site of LiFeBO3 cathode material for lithium-ion battery

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Abstract
Fluorine substituted LiFeBO3 at oxygen site, LiFeBO3-xF2x (LFeBF, x = 0, 0.05, 0.1, 0.2, 0.3, and 0.5), have been synthesized by solid-state reaction method to improve electrochemical properties as a cathode material of lithium-ion batteries. The structural studies of LFeBF depending on fluorine substitution ratio have been performed with X-ray diffraction (XRD) and 7Li magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, which results show the structure of samples are changed from monoclinic to vonsenite. The morphology and elemental maps have been observed by scanning electron microscopy (SEM) combined energy dispersive X-ray (EDX) spectrometer. The SEM images of LFeBF showed the morphology change with increasing fluorine substitution ratio. The electrochemical study is performed by galvanostatic charge and discharge test with the potential range of 1.0 – 4.5 V. The results have shown that fluorine substitution at oxygen site of LiFeBO3 has effectively improved electrochemical performance with the highest discharge capacity of 363.98 mAh g-1 at 0.05 C rate for LFeBF (x = 0.3).
Author(s)
우맘코이룰
Issued Date
2020
Awarded Date
2020-02
Type
Dissertation
Keyword
Chemistry
URI
https://oak.ulsan.ac.kr/handle/2021.oak/6390
http://ulsan.dcollection.net/common/orgView/200000293729
Alternative Author(s)
Khoirul Umam
Affiliation
울산대학교
Department
일반대학원 화학과
Advisor
Prof. Youngil Lee
Degree
Master
Publisher
울산대학교 일반대학원 화학과
Language
eng
Rights
울산대학교 논문은 저작권에 의해 보호받습니다.
Appears in Collections:
Chemistry > 1. Theses (Master)
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