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3. Boric acid-crosslinked poly(vinyl alcohol): biodegradable, biocompatible, robust, and high-barrier paper coating.

Author

Choe, Shinhyeong, You, Seulki, Park, Kitae, Kim, Youngju, Park, Jehee, Cho, Yongjun, Seo, Jongchul, Yang, Hanseul, and Myung, Jaewook

Subjects
PLASTIC scrap, PACKAGING waste, SURFACE coatings, PLASTICS in packaging, KRAFT paper, BIODEGRADABLE plastics
Abstract

The accumulation of plastic packaging wastes in the natural environment highlights the significance of sustainable alternatives. Paper is widely used as a biodegradable packaging material, but poor mechanical strength, barrier properties, and water resistance limit its utility. Typical paper coating materials applied to overcome such drawbacks, such as polyethylene (PE) and ethylene vinyl alcohol (EVOH), are not desirable for sustainability due to environmental persistence. Here, we report a biodegradable, biocompatible, robust, and high-barrier paper coating strategy using boric acid-crosslinked poly(vinyl alcohol) (PVA). Various crosslinked-PVA solutions were prepared using boric acid (BA) and hydrochloric acid (HCl) as a crosslinker and an acid catalyst, respectively. The solutions were coated onto the Kraft paper (KP) through facile bar coating with epichlorohydrin (ECH) as a binder (henceforth referred to as coated papers). The coated papers (KP-P, KP-PB, KP-PBH) show remarkably improved oxygen (∼0.89 cc m−2 d−1) and water vapor (∼5.17 g m−2 d−1) barrier properties as well as tensile strength (∼53.0 MPa) that is retained in moist conditions. The coated papers were significantly mineralized into CO2 (59.2–81.6% over 111 d) in the simulated marine environment biodegradation test. Depolymerization of polymer chains and surface degradation of coated papers are evidenced via FT-IR and SEM, respectively. The microcosm test revealed that the intensive disintegration of the coated papers is synergistically driven by both biotic and abiotic factors (i.e., mechanical stress). Moreover, the in vitro biocompatibility tests employing human embryonic kidney and mouse embryonic fibroblast cells, and in vivo biocompatibility test with mice suggest that the coated papers are highly biocompatible. This work provides a promising strategy for paper packaging that enhances packaging performance without compromising environmental sustainability. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Evidence of Zintl Intermediate Phase and Its Impacts on Li and Na Storage Performance of Pb-Based Alloying Anodes

Author

Park, Jehee, primary, Han, Jinhyup, additional, Gim, Jihyeon, additional, Garcia, Juan, additional, Iddir, Hakim, additional, Ahmed, Shabbir, additional, Xu, Gui-Liang, additional, Amine, Khalil, additional, Johnson, Christopher, additional, Jung, Youngjae, additional, Kim, Youngsik, additional, Bak, Seong-Min, additional, and Lee, Eungje, additional

Published
2023
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6. LT-LiNi1/3Mn1/3Co1/3O2: A Partially-Disordered, Composite Rock Salt Cathode Prepared by Flame Spray Pyrolysis for Li-Ion Batteries

Author

Ku, Kyojin, primary, Han, Jinhyup, additional, Li, Linze, additional, Gim, Jihyeon, additional, Park, Jehee, additional, Shi, Boyu, additional, Liang, Yujia, additional, Stark, Anthony, additional, Wang, Chongmin, additional, Croy, Jason R., additional, Thackeray, Michael, additional, Libera, Joseph, additional, and Lee, Eungje, additional

Published
2023
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7. A Carboranyl Electrolyte Enabling Highly Reversible Sodium Metal Anodes via a “Fluorine‐Free” SEI

Author

Tomich, Anton W., primary, Park, Jehee, additional, Son, Seoung‐Bum, additional, Kamphaus, Ethan P., additional, Lyu, Xingyi, additional, Dogan, Fulya, additional, Carta, Veronica, additional, Gim, Jihyeon, additional, Li, Tao, additional, Cheng, Lei, additional, Lee, Eungje, additional, Lavallo, Vincent, additional, and Johnson, Christopher S., additional

Published
2022
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11. Layered Oxide Cathode-Inspired Secondary Hard Carbon Microsphere Anode Material for High-Power and Long-Life Rechargeable Batteries

Author

Oh, Hyun Ju, primary, Kang, Hyo kyoung, additional, Ahn, Hyunchul, additional, Park, Jehee, additional, Choi, Jun, additional, Kim, Hak Yong, additional, Lee, Eungje, additional, Yeo, Sang Young, additional, Choi, Yeong Og, additional, Yeang, Byeong Jin, additional, Son, Seoung-Bum, additional, and Lee, Byoung-Sun, additional

Published
2022
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14. Pb‐Based Nanocomposite Anodes: New High‐Performance Pb‐Based Nanocomposite Anode Enabled by Wide‐Range Pb Redox and Zintl Phase Transition (Adv. Funct. Mater. 2/2021)

Author

Han, Jinhyup, primary, Park, Jehee, additional, Bak, Seong‐Min, additional, Son, Seoung‐Bum, additional, Gim, Jihyeon, additional, Villa, Cesar, additional, Hu, Xiaobing, additional, Dravid, Vinayak P., additional, Su, Chi Cheung, additional, Kim, Youngsik, additional, Johnson, Christopher, additional, and Lee, Eungje, additional

Published
2021
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16. New High‐Performance Pb‐Based Nanocomposite Anode Enabled by Wide‐Range Pb Redox and Zintl Phase Transition

Author

Han, Jinhyup, primary, Park, Jehee, additional, Bak, Seong‐Min, additional, Son, Seoung‐Bum, additional, Gim, Jihyeon, additional, Villa, Cesar, additional, Hu, Xiaobing, additional, Dravid, Vinayak P., additional, Su, Chi Cheung, additional, Kim, Youngsik, additional, Johnson, Christopher, additional, and Lee, Eungje, additional

Published
2020
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25. New High‐Performance Pb‐Based Nanocomposite Anode Enabled by Wide‐Range Pb Redox and Zintl Phase Transition.

Author

Han, Jinhyup, Park, Jehee, Bak, Seong‐Min, Son, Seoung‐Bum, Gim, Jihyeon, Villa, Cesar, Hu, Xiaobing, Dravid, Vinayak P., Su, Chi Cheung, Kim, Youngsik, Johnson, Christopher, and Lee, Eungje

Subjects
*ZINTL compounds, *PHASE transitions, *NANOCOMPOSITE materials, *OXIDATION-reduction reaction, *X-ray absorption, *CARBON-black, *ANODES
Abstract

This paper describes a new, high‐performance, Pb‐based nanocomposite anode material for lithium‐ion batteries. A unique nanocomposite structure of Pb@PbO core‐shell nanoparticles in a carbon matrix is obtained by using a simple high‐energy ball milling method using the low‐cost starting materials PbO and carbon black. Electrochemical performance tests show its excellent reversible capacity (≈600 mAh g−1) and cycle stability (92% retention at 100th cycle), which are one of the best values reported for Pb‐based anodes in the literature. Synchrotron X‐ray diffraction and absorption techniques revealed the detailed lithium storage mechanism that can be highlighted with the unexpectedly wide reversible Pb redox range (between Pb2+ and Pb4−) and the evolution of Zintl‐type LiyPb structures during the electrochemical lithium reaction. The results provide new insights into the lithium storage mechanism of these Pb‐based materials and their potential as low‐cost, high‐performance anodes. [ABSTRACT FROM AUTHOR]

Published
2021
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29. Nanocrevasse-Rich Carbon Fibers for Stable Lithium and Sodium Metal Anodes

Author

Go, Wooseok, Kim, Min-Ho, Park, Jehee, Lim, Chek Hai, Joo, Sang Hoon, Kim, Youngsik, and Lee, Hyun-Wook

Abstract

Metallic lithium (Li) and sodium (Na) anodes have received great attention as ideal anodes to meet the needs for high energy density batteries due to their highest theoretical capacities. Although many approaches have successfully improved the performances of Li or Na metal anodes, many of these methods are difficult to scale up and thus cannot be applied in the production of batteries in practice. In this work, we introduce nanocrevasses in a carbon fiber scaffold which can facilitate the penetration of molten alkali metal into a carbon scaffold by enhancing its wettability for Li/Na metal. The resulting alkali metal/carbon composites exhibit stable long-term cycling over hundreds of cycles. The facile synthetic method is enabled for scalable production using recycled metal waste. Thus, the addition of nanocrevasses to carbon fiber as a scaffold for alkali metals can generate environmentally friendly and cost-effective composites for practical electrode applications.

Published
2019
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31. A Carboranyl Electrolyte Enabling Highly Reversible Sodium Metal Anodes via a "Fluorine-Free" SEI.

Author

Tomich AW, Park J, Son SB, Kamphaus EP, Lyu X, Dogan F, Carta V, Gim J, Li T, Cheng L, Lee E, Lavallo V, and Johnson CS

Abstract

Realization of practical sodium metal batteries (SMBs) is hindered due to lack of compatible electrolyte components, dendrite propagation, and poor understanding of anodic interphasial chemistries. Chemically robust liquid electrolytes that facilitate both favorable sodium metal deposition and a stable solid-electrolyte interphase (SEI) are ideal to enable sodium metal and anode-free cells. Herein we present advanced characterization of a novel fluorine-free electrolyte utilizing the [HCB 11 H 11 ] 1- anion. Symmetrical Na cells operated with this electrolyte exhibit a remarkably low overpotential of 0.032 V at a current density of 2.0 mA cm -2 and a high coulombic efficiency of 99.5 % in half-cell configurations. Surface characterization of electrodes post-operation reveals the absence of dendritic sodium nucleation and a surprisingly stable fluorine-free SEI. Furthermore, weak ion-pairing is identified as key towards the successful development of fluorine-free sodium electrolytes., (© 2022 Wiley-VCH GmbH.)

Published
2022
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