화학공학소재연구정보센터
학회 한국화학공학회
학술대회 2022년 봄 (04/20 ~ 04/23, 제주국제컨벤션센터)
권호 28권 1호, p.461
발표분야 [주제 8] 에너지 저장
제목 Inhomogeneous reaction kinetics of layered oxide cathode in lithium-ion batteries: reaction-limited vs. diffusion-limited
초록 This presentation, I will show that the apparent phase separation is a dynamical artefact occurring in a many-particle system driven by autocatalytic electrochemical reactions, that is, an interfacial exchange current that increases with the extent of delithiation. I experimentally validate this population-dynamics model using the single-phase material Lix(Ni1/3Mn1/3Co1/3)O2 (0.5 < x < 1) and demonstrate generality with other transition-metal compositions. Operando diffraction and nanoscale oxidation-state mapping unambiguously prove that this fictitious phase separation is a repeatable non-equilibrium effect. I quantitatively confirm the theory with multiple-datastream-driven model extraction. More generally, our study experimentally demonstrates the control of ensemble stability by electro-autocatalysis, highlighting the importance of population dynamics in battery electrodes (even non-phase-separating ones).

# keywords: Particle by particle reaction, reaction limited system, diffusion limited system, layered oxide, cathode, lithium-ion battery, Particle by particle reaction, reaction limited system, diffusion limited system, layered oxide, cathode, lithium-ion battery
저자 박정진
소속 한국과학기술(연)
키워드 에너지 환경(Energy and Environment)
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