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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Metal-Ion Chelating Gel Polymer Electrolyte for Ni-Rich Layered Cathode Materials at a High Voltage and an Elevated Temperature

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Title
Metal-Ion Chelating Gel Polymer Electrolyte for Ni-Rich Layered Cathode Materials at a High Voltage and an Elevated Temperature
Author
Cho, Yoon-GyoJung, Seo HyunJeong, JihongCha, HyungyeonBaek, KyungeunSung, JaekyungKim, MinsooLee, Hyun TaeKong, HoyoulCho, JaephilKang, Seok JuPark, Jong MokSong, Hyun-Kon
Issue Date
2021-03
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.13, no.8, pp.9965 - 9974
Abstract
Nickel-rich layered oxides (LiNi1-x-yCoxMnyO2; (1 - x - y) >= 0.6), the high-energy-density cathode materials of lithium-ion batteries (LIBs), are seriously unstable at voltages higher than 4.5 V versus Liar and temperatures higher than 50 degrees C. Herein, we demonstrated that the failure mechanism of a nickel-rich layered oxide (LiNi0.6Co0.2Mn0.2O2) behind the instability was successfully suppressed by employing cyanoethyl poly(vinyl alcohol) having pyrrolidone moieties (Pyrd-PVA-CN) as a metal-ion-chelating gel polymer electrolyte (GPE). The metal-ion-chelating GPE blocked the plating of transition-metal ions dissolved from the cathode by capturing the ions (anode protection). High-concentration metal-ion environments developed around the cathode surface by the GPE suppressed the irreversible phase transition of the cathode material from the layered structure to the rock-salt structure (cathode protection). Resultantly, the capacity retention was significantly improved at a high voltage and a high temperature. Capacity retention and coulombic efficiency of a full-cell configuration of a nickel-rich layered oxide with graphite were significantly improved in the presence of the GPE especially at a high cutoff voltage (4.4 V) and an elevated temperature (55 degrees C).
URI
https://scholarworks.unist.ac.kr/handle/201301/52741
URL
https://pubs.acs.org/doi/10.1021/acsami.0c21164
DOI
10.1021/acsami.0c21164
ISSN
1944-8244
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