In situ transmission electron microscopy graphene liquid cell on chemical sodiation of nickel oxide nanoparticles = 그래핀 액상 셀 실시간 투과전자현미경을 이용한 산화니켈 나노입자의 화학적 소듐화 관찰

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Nickel oxide (NiO) is one of the transition metal oxide been studied as effective electrode material for sodium ion batteries with response to it is high theoretical specific capacity, good rate capability and excellent cycling performance for sodium storage. However, to date out of $718mAhg^{-1}$ the sodiation theoretical capacity of NiO, only $480mAhg^{-1}$ was practically achieved. Almost 34% of this capacity is not usable. For efficiently utilizing this electrode material via suitable structure design, this study attempted to understand in deeply the chemical sodiation mechanism on NiO nanoparticles (NPs) through advanced in situ transmission electron microscopy approach using graphene liquid cell, a liquid film of sodium electrolyte consisting of NiO NPs has been encapsulated between two layers of graphene transferred on the 200 mesh Au grid. Relatively to others in situ techniques, graphene liquid cell testified to offers clear insight with high atomic resolution for morphological evolutions during real time observation of the sodiation in actual liquid electrolyte. During chemical sodiation the conversion reaction between NiO NPs and Na-ion to form crystalline $Na_2O$ and Ni NPs was investigated. Likewise, high resolution images revealed the sodiation mechanisms to be accompanied with the formation of incoherent interphase boundaries between Ni and $Na_2O$ phases.
Advisors
Lee, Jeong Yongresearcher이정용researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2016.8 ,[viii, 51 p. :]

Keywords

Sodium ion batteries; interphase; boundaries; conversion reaction; liquid cell

URI
http://hdl.handle.net/10203/221594
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663395&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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