KLI

Phase transition-induced improvement in the capacity of fluorine-substituted LiFeBO3 as a cathode material for lithium ion batteries

Metadata Downloads
Abstract
Among polyanion-type cathode materials used for large-scale lithium-ion batteries (LIBs), LiFeBO 3 (LFeB) has received attention due to its lowest weight framework with a larger theoretical capacity of 220 mAh g ?1 compared with commercialized LiFePO 4 (170 mAh g ?1 ). The main drawback of LFeB, however, is its poor specific discharge capacity as a cathode material for LIBs. Herein, the fluorine-substituted LFeB at the oxygen site, LiFeBO 3- x F 2 x (LFeBF, x = 0.05, 0.1, 0.2, 0.3, and 0.5), has been prepared as a cathode ma- terial for LIBs via a solid-state reaction to improve the electrochemical behavior accompanied by phase transition. Morphological change as increasing x and well-distributed fluorine element of LFeBF have been observed using a scanning electron microscope combined with an energy dispersive X-ray spectrometer. X-ray diffraction, X-ray photoelectron spectroscopy, and solid-state 7 Li and 11 B nuclear magnetic reso- nance spectroscopy studies of LFeBF as well as increasing x show a dramatic phase transition from mon- oclinic to vonsenite-type structure. The plausible atomic arrangement has been also investigated using density functional theory. Furthermore, the fluorine substitution at the oxygen site of LFeB leads to a re- markable improvement in discharge capacity, the highest value (361.15 mAh g ?1 for LFeBF ( x = 0.3)) of which is about five times larger than that of LFeB (73.43 mAh g ?1 ) at 0.05 C rate, without any additional carbon source.
Author(s)
우맘 코이룰신병철Laxman Singh문채원최재은이인영Jaewoong Lim정재훈Myoung Soo Lah이영일
Issued Date
2021
Type
Article
Keyword
Fluorine-substituted LiFeBO3VonseniteSolid-state NMRDensity functional theory calculationsCathode material for lithium ion battery
DOI
10.1016/j.electacta.2020.137364
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9616
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_electacta_2020_137364&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Phase%20transition-induced%20improvement%20in%20the%20capacity%20of%20fluorine-substituted%20LiFeBO3%20as%20a%20cathode%20material%20for%20lithium%20ion%20batteries&offset=0&pcAvailability=true
Publisher
ELECTROCHIMICA ACTA
Location
영국
Language
영어
ISSN
0013-4686
Citation Volume
367
Citation Number
1
Citation Start Page
137364
Citation End Page
137371
Appears in Collections:
Natural Science > Chemistry
Authorize & License
  • Authorize공개
Files in This Item:
  • There are no files associated with this item.

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.