Facile <i>ex situ</i> formation of a LiF–polymer composite layer as an artificial SEI layer on Li metal by simple roll-press processing for carbonate electrolyte-based Li metal batteries

Sun, Seho; Myung, Seungcheol; Kim, Gaeun; Lee, Dong‐Soo; Son, Hyunsu; Jang, Moongyu; Park, Eunkyung; Son, Byoungkuk; Jung, Yeon Gil; Paik, Ungyu; Song, Taeseup

doi:10.1039/d0ta05372d

Cited by 76 publications

(46 citation statements)

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“…It has been reported that LiF/defluorinated polymers SEI can be obtained by continuous roll-press 24 , but the reaction mechanism is still not clear. Differently, in our case, only an inducing force is needed to start the reaction without any other physical and chemical processes.…”

Section: Resultsmentioning

confidence: 99%

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

et al. 2021

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Potassium (K) metal is a promising alkali metal anode for its high abundance. However, dendrite on K anode is a serious problem which is even worse than Li. Artificial SEI (ASEI) is one of effective routes for suppressing dendrite. However, there are still some issues of the ASEI made by the traditional methods, e.g. weak adhesion, insufficient/uneven reaction, which deeply affects the ionic diffusion kinetics and the effect of inhibiting dendrites. Herein, through a unique self-catalysis tribo-electrochemistry reaction, a continuous and compact protective layer is successfully constructed on K metal anode in seconds. Such a continuous and compact protective layer can not only improve the K+ diffusion kinetics, but also strongly suppress K dendrite formation by its hard mechanical properties derived from rigid carbon system, as well as the improved K+ conductivity and lowered electronic conductivity from the amorphous KF. As a result, the potassium symmetric cells exhibit stable cycles last more than 1000 h, which is almost 500 times that of pristine K.

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Section: Resultsmentioning

confidence: 99%

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

et al. 2021

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“…As for the control sample, the peaks at 685.2 eV and 686.3 eV can be assigned to the compound of LiF and C-F. It is obvious that an increased proportion of LiF is obtained on the modified Cu, which is essential for uniform and stable SEI [27,28] .…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 91%

A binary PMMA/PVDF blend film modified substrate enables a superior lithium metal anode for lithium batteries

et al. 2021

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“…Perhaps the most straightforward top-down approach of engineering an Art-SEI is the application of a powder layer and subsequent fixation by mechanical pressure. [136][137][138] This is especially viable for Li metal since its softness favors the embedding of particles. Goodenough's group loaded Li 3 N as well as Al 2 O 3 particles on Li foil and subjected to a rollpressing procedure, see Figure 6a,b.…”

Section: Pressingmentioning

confidence: 99%

“…Sun et al prepared a LiF-polymer composite layer (LiF@ Po) by roll-pressing polytetrafluoroethylene (PTFE) onto Li metal. [138] The interphase between PTFE and Li is proposed to form a LiF layer, while further inside the PTFE a polymeric layer is built. Both these layers remain on the Li surface as the PTFE film is detached.…”

Section: Pressingmentioning

confidence: 99%

Molecular Engineering Approaches to Fabricate Artificial Solid‐Electrolyte Interphases on Anodes for Li‐Ion Batteries: A Critical Review

Fedorov

Maletti

Heubner

et al. 2021

Advanced Energy Materials

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in further markets, such as electromobility and large-scale grid storage. Although LIBs offer high energy density and have reached a high level of maturity, there are still many technological challenges to meet established user habits and increasing demands. [1] Among the remaining challenges of LIBs, one of the most crucial issues is the electrochemical instability of anodes toward electrolytes. When using anode materials with favorably low electrode potentials close to Li/Li + , common liquid electrolytes are decomposed. Ideally, this leads to the formation of a stable so-called solid-electrolyte interphase (SEI), preventing further electrolyte decomposition and leading to stable cycling performance. Furthermore, the SEI has decisive influence on the charge/discharge kinetics of the battery, as this is where the Li-ions overcome the interface between the electrolyte and the electrode. Accordingly, the SEI is a key component that determines the performance of LIBs. The "natural SEI" that forms at the anode/electrolyte interface during initial cycling represents a thin layer made of salts, oxides, polymers. [2] The conceptual model of SEI was introduced by Peled in 1979 [3] and further developed by other groups. [4][5][6][7][8][9][10][11][12] According to this model, natural SEIs possess only ionic conductivity, while serving as a barrier to electron transfer. In this regard, the thickness and conformity of SEI An intrinsic challenge of Li-ion batteries is the instability of electrolytes against anode materials. For anodes with a favorably low operating potential, a solid-electrolyte interphase (SEI) formed during initial cycles provides stability, traded off for capacity consumption. The SEI is mainly determined by the anode material, electrolyte composition, and formation conditions. Its properties are typically adjusted by changing the liquid electrolyte's composition. Artificial SEIs (Art-SEIs) offer much more freedom to address and tune specific properties, such as chemical composition, impedance, thickness, and elasticity. Art-SEIs for intercalation, alloying, conversion and Li metal anodes have to fulfil varying requirements. In all cases, sufficient transport properties for Li-ions and (electro-)chemical stability must be guaranteed. Several approaches for Art-SEIs preparation have been reported: from simple casting and coating techniques to elaborated Phys-Chem modifications and deposition processes. This review critically reports on the promising approaches for Art-SEIs formation on different type of anode materials, focusing on methodological aspects. The specific requirements for each approach and material class, as well as the most effective strategies for Art-SEI coating, are discussed and a roadmap for further developments towards next-generation stable anodes are provided.

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Facile ex situ formation of a LiF–polymer composite layer as an artificial SEI layer on Li metal by simple roll-press processing for carbonate electrolyte-based Li metal batteries

Abstract: Lithium (Li) metal has been considered as an ideal anode for next-generation Li metal batteries (LMBs). However, Li dendrite formation and low Coulombic efficiency (CE) are major obstacles for the...

Cited by 76 publications

References 46 publications

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

A binary PMMA/PVDF blend film modified substrate enables a superior lithium metal anode for lithium batteries

Molecular Engineering Approaches to Fabricate Artificial Solid‐Electrolyte Interphases on Anodes for Li‐Ion Batteries: A Critical Review

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