KLI

Synthesis and Electrochemical Performance of Lithium Vanadium Sulfate-based Polyanionic Compound for Cathode Materials Li-ion Battery

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Abstract
The development of polyanionic compound Li−ion batteries (LIBs) is rapidly growing to support green sustainable energy especially for electric vehicles (EVs). In this work, a double sulfate LiV(SO4)2 material has been successfully synthesized, having high discharge potential and excellent stability. Our investigation shows that LiV(SO4)2 has a crystal structure of trigonal rhombohedral which provides a two−dimensional framework parallel with ab−plane for Li−ion accommodation. LiV(SO4)2 was synthesized by Li2SO4, (NH4)2SO4, V2O5, and H2C2O4·2H2O as raw material. This material was synthesized by the water−based solution method at low temperature. Sintering temperature 350 ℃, sintering time 1 h, and an additional 50% wt. excess oxalic acid dihydrate was obtained as an optimum condition for synthesis in inert argon gas atmosphere. Electrochemical performance of LiV(SO4)2 as cathode material shows ⁓60% of lithium ions are extractable with 107 mA g-1 rate in ambient condition through potential range 1.0 V – 4.8 V for 50 cycles. The potential of discharge was observed at 3.9 V vs. Li+/Li in the 2016 type coin cell. Infrared spectroscopy and SEM−EDX were conducted. The charge-discharge phenomenon of this material was proposed as a pseudocapacitive mechanism related to the structure and cyclic voltammetry measurement. This discovery may lead to the potential base material to obtain a higher stoichiometric composition by accomodating more than one Li−ion, which will be valuable for the next high power density rechargeable battery generation.
Author(s)
푸트란토 레이한 푸지
Issued Date
2021
Awarded Date
2021-02
Type
Dissertation
Keyword
Cathode materialelectrochemistryLi-ion batterypolyanionic compoundsulfatevanadium.
URI
https://oak.ulsan.ac.kr/handle/2021.oak/6025
http://ulsan.dcollection.net/common/orgView/200000371451
Alternative Author(s)
Reyhan Puji Putranto
Affiliation
울산대학교
Department
일반대학원 화학과
Advisor
Professor 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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