Understanding electronic and structural effects on the electrochemical performances of Li-rich cathodes = 리튬 리치 양극 재료의 전자 및 구조적 효과 분석을 통한 전기화학적 특성 이해

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Li-rich cathode is one of the promising high capacity energy storage for future applications. While layered Lirich cathodes are studied the most, they are susceptible to phase transformation when Li is depleted. To address this problem, $\beta-Li_2MO_3$ (M = transition metal) have been considered because three-dimensionally connected transition metals can prevent the phase transformation. However, only $\beta-Li_2IrO_3$ has been reported. Therefore, first of all, we systematically investigate the trend of $\beta-Li_2MO_3$ (M = 3d, 4d, or 5d transition metals) as cyclable Li-rich cathodes using electronic structure calculations. We find the charge transfer energy (or the relative band positions) computed from density of states correlates to the activity and reversibility of oxygen redox as well as voltage. Though 3d transition metal substitutions to $\beta-Li_2MO_3$ are desired economically, it promotes O-O dimer formation, indicating the irreversible phase degradation and voltage hysteresis. After that we investigated the charge transfer energy can also predict cyclability of extended chemical space considering various TM arrangement, including TM disordered structure and different Li/M composition.
Advisors
Jung, Yousungresearcher정유성researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2020.2,[v, 64 p. :]

Keywords

Charge transfer energy▼aCyclability▼aOxygen dimer▼a$\beta-Li_2MO_3$▼aTransition metal disordered structure; Md -O2p 전하 전달 에너지▼a수명 특성▼a산소 이합체▼a$\beta-Li_2MO_3$▼a무질서한 구조

URI
http://hdl.handle.net/10203/284108
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=908508&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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