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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Boosting Reaction Homogeneity in High-Energy Lithium-Ion Battery Cathode Materials

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Title
Boosting Reaction Homogeneity in High-Energy Lithium-Ion Battery Cathode Materials
Author
Cha, HyungyeonKim, JunhyeokLee, HyomyungKim, NamhyungHwang, JaeseongSung, JaekyungYoon, MoonsuKim, KyunghoCho, Jaephil
Issue Date
2020-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.32, no.39, pp.2003040
Abstract
Conventional nickel-rich cathode materials suffer from reaction heterogeneity during electrochemical cycling particularly at high temperature, because of their polycrystalline properties and secondary particle morphology. Despite intensive research on the morphological evolution of polycrystalline nickel-rich materials, its practical investigation at the electrode and cell levels is still rarely discussed. Herein, an intrinsic limitation of polycrystalline nickel-rich cathode materials in high-energy full-cells is discovered under industrial electrode-fabrication conditions. Owing to their highly unstable chemo-mechanical properties, even after the first cycle, nickel-rich materials are degraded in the longitudinal direction of the high-energy electrode. This inhomogeneous degradation behavior of nickel-rich materials at the electrode level originates from the overutilization of active materials on the surface side, causing a severe non-uniform potential distribution during long-term cycling. In addition, this phenomenon continuously lowers the reversibility of lithium ions. Consequently, considering the degradation of polycrystalline nickel-rich materials, this study suggests the adoption of a robust single-crystalline LiNi(0.8)Co(0.1)Mn(0.1)O(2)as a feasible alternative, to effectively suppress the localized overutilization of active materials. Such an adoption can stabilize the electrochemical performance of high-energy lithium-ion cells, in which superior capacity retention above approximate to 80% after 1000 cycles at 45 degrees C is demonstrated.
URI
https://scholarworks.unist.ac.kr/handle/201301/48063
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202003040
DOI
10.1002/adma.202003040
ISSN
0935-9648
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