Electrically conductive metal oxide-Assisted multifunctional separator for highly stable Lithium-Metal batteries

Kim, Junghwan; Kwon, Kihwan; Roh, Kwangchul; Kwon, Jiseok; Song, Taeseup; Joohyun Kim, Patrick; Choi, Junghyun

doi:10.1016/j.elecom.2023.107558

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…To achieve long-term cycling stability for Li metal batteries (LMBs), it is crucial to regulate the Li-ion flux, which is highly associated with the homogeneity of Li deposition, during electrochemical reactions rather than simply blocking the penetration of grown Li dendrites. A wide range of strategies have been proposed with focus on the (i) optimization of electrolyte with additives, − (ii) design of functional current collectors, − and (iii) fabrication of advanced separators. − Among these strategies, the surface modification of the polymer separator with functional materials is the most attractive approach owing to its wide range of coating material options and its applicability to the existing separator production line . Therefore, several researchers have coated polymer separators with various functional materials (e.g., Al 2 O 3 , boehmite, and NbO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Yang,

Kim,

Lee

et al. 2024

ACS Appl. Mater. Interfaces

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Lithium (Li) metal is considered an ultimate anode owing to its high specific capacity and energy density. However, uncontrolled Li dendrite growth and low Coulombic efficiency have limited the application of Li metal. Among various strategies introduced to address these limitations, the surface modification of polyolefin separators with functional materials has been widely adopted for improving the mechanical and thermal stabilities of polymer separators and to protect the separator from the penetration of Li dendrites. Herein, we report a new functional polymer separator that is surface-altered with a graphene-based Li-ion flux regulator (GLR) to homogenize the Li-ion flux and suppress the growth of sharp dendritic Li in Li metal batteries. The nanopores distributed through the GLR structure serve as channels for ion transport and junctions for electron transfer, facilitating efficient electrolyte penetration and rapid charge transfer between graphene (Gr) sheets. Owing to these favorable features of porous GLR, a Li−Cu cell with the GLR surfacealtered polypropylene separator (GLR-PP) delivers excellent cycle and rate performances compared to a Li−Cu cell with a Gr surface-altered polypropylene separator. In addition, among the tested cells, Li−sulfur cells with GLR-PP exhibit the most stable cycle performance over 500 cycles. These results demonstrate that the concept of tailoring the surface of a polymer separator with porous 2D materials is an effective strategy for improving the long-term cycle stability and electrochemical kinetics of Li metal-based batteries and would trigger further relevant studies.

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Section: Introductionmentioning

confidence: 99%

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Yang,

Kim,

Lee

et al. 2024

ACS Appl. Mater. Interfaces

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Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Kwon,

Kim,

Han

et al. 2024

Small Science

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LiFePO4 emerges as a viable alternative to cobalt‐containing cathodes, such as Li[Ni1–x–yMnxCoy]O2 and Li[Ni1−x−yCoxAly]O2. As Fe is abundant in nature, LiFePO4 is a low‐cost material. Moreover, stable structure of LiFePO4 imparts long service life and thermal stability. However, the practical implementation of LiFePO4 cathode in energy storage devices is impeded by its low energy density and high ionic/electrical resistance. Herein, the LiFePO4 electrode with high active material loading and low ionic/electrical resistance through the dry process is reported for the first time. The dry process not only enables the uniform distribution of the polymeric binders and conductive additives within the thick electrode but also inhibits the formation of cracks. Furthermore, the bridge‐like connection of polytetrafluoroethylene facilitates the insertion and extraction of Li ions to the LiFePO4 crystal. Hence, the dry‐processed LiFePO4 electrode with high areal capacity (7.8 mAh cm−2) exhibits excellent cycle stability over 300 cycles in full‐cell operation. In addition, it is demonstrated that the estimated energy density of prismatic cell with the dry‐processed LiFePO4 electrode is competitive with state‐of‐the‐art Li[Ni1–x–yMnxCoy]O2‐based battery.

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Dendrite-suppressed Li deposition enabled by surface-tailored carbon-based current collectors for high-rate and stable Li-metal batteries

Lee,

Yang,

Lee

et al. 2024

Carbon

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Electrically conductive metal oxide-Assisted multifunctional separator for highly stable Lithium-Metal batteries

Cited by 6 publications

References 31 publications

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Dendrite-suppressed Li deposition enabled by surface-tailored carbon-based current collectors for high-rate and stable Li-metal batteries

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Electrically conductive metal oxide-Assisted multifunctional separator for highly stable Lithium-Metal batteries

Cited by 6 publications

References 31 publications

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Uniform Li Deposition through the Graphene-Based Ion-Flux Regulator for High-Rate Li Metal Batteries

Low‐Resistance LiFePO4 Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Dendrite-suppressed Li deposition enabled by surface-tailored carbon-based current collectors for high-rate and stable Li-metal batteries

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Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries