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Li Intercalation into Carbonaceous Anode Materials for LiAlCl4∙3SO2 Electrolyte Based Lithium Ion Battery

Title
Li Intercalation into Carbonaceous Anode Materials for LiAlCl4∙3SO2 Electrolyte Based Lithium Ion Battery
Author
Ayoung Kim
Alternative Author(s)
김아영
Advisor(s)
김한수
Issue Date
2019-02
Publisher
한양대학교
Degree
Doctor
Abstract
Extensive efforts have been devoted to developing a new battery chemistry that can replace the current technology of lithium-ion batteries (LIB). In recent years, enhancement of electrochemical properties and safety of battery is the biggest challenges for next-generation secondary battery system. One way of improving the safety of battery is to replace the liquid organic electrolyte with more stable electrolyte. In particular, SO2-based inorganic liquid electrolyte showed non-flammability and higher ionic conductivity than conventional organic electrolyte can accelerate the rate capability of the battery than those of the organic electrolyte based cells. Herein, I demonstrated that lithium ions in SO2-based inorganic liquid electrolyte reversibly can be intercalated and de-intercalated into / out of the carbonaceous electrode. Graphite in LiAlCl4·3SO2 electrolyte showed stable cycle performance and outstanding rate capability compared to graphite in conventional organic electrolyte. Low temperature performances of carbon active materials were investigated and those of soft carbon and hard carbon showed better electrochemical performance than that of organic electrolyte at low temperature. From the main electrochemical reaction in the carbonaceous electrode using LiAlCl4·3SO2 electrolyte was lithium intercalation / de-intercalation into carbonaceous negative electrode rather than electrolyte decomposition, LiFePO4 / graphite full cell in LiAlCl4·3SO2 electrolyte was investigated to know the technical feasibility of LIB based on LiAlCl4·3SO2 electrolyte. Further studies are needed to clarify the exact reaction mechanism of the graphite anode in the full cell, thereby improving the full cell performance
however, the possibilities presented by this system show that this system can be another promising candidate for next-generation LIB systems with improving the battery performance and safety.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/99430http://hanyang.dcollection.net/common/orgView/200000434599
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > ENERGY ENGINEERING(에너지공학과) > Theses (Ph.D.)
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