Different Dynamics of Lithiation and Sodiation of CuS Nanoparticle Revealed by In-situ Electron Microscopy = 실시간 전자현미경을 이용한 황화구리 나노입자의 리튬화 및 소듐화 반응의 비교연구

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A number of research for development of novel electrode with high capacity, stable cyclability and low cost for rechargeable battery have been carried out to various portable electronic device and electric vehicles and hybrid electric vehicles. To develop more enhanced battery, various in-situ studies have been carried out to understand reaction mechanisms. A number of studies about CuS as an anode material of rechargeable batteries because of its high capacity (~ 560mah/g) and high electronic conductivity $(~ 10^3 S/cm)$. Understanding clear mechanism of reaction mechanism is necessary for development durable anode materials for batteries. In this study, transmission electron microscopy (TEM) is used for observation of lithiation and sodiation reaction of hexagonal CuS nanoparticles. LiF and NaF were employed for providing lithium and sodium metal to CuS. LiF and NaF were dissociated by electron beam, generating Li and Na sources. Generated Li and Na sources reacted with CuS nanoparticles, showing different reaction mechanisms. Displacement reaction was observed in lithiation reaction where sulfur position was retained while copper was completely replaced by Li. In terms of sodiation, displacement-conversion combined reaction was observed in sodiation reaction in which sodium sulfide micro-grains were formed and copper spheres were embedded in the grains. This different aspect is very unique because lithium and sodium both are monovalent and lithium sulfide and sodium sulfide both also have same cubic structure. This unique phenomenon might be happened by difference of diffusion barrier of copper in $Li_2S$ and $Na_2S$.
Advisors
Lee, Jeong Yongresearcher이정용researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2017.2,[iv, 46 p. :]

Keywords

Copper sulfide; Lithium fluoride; Sodium fluoride; Displacement reaction; Conversion reaction; 황화구리; 리튬 플루오라이드; 소듐 플루오라이드; 대체반응; 전환반응

URI
http://hdl.handle.net/10203/243162
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675286&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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