Tailoring the Mechanical and Electrochemical Properties of an Artificial Interphase for High‐Performance Metallic Lithium Anode

Sun, Yipeng; Amirmaleki, Maedeh; Zhao, Yang; Zhao, Changtai; Liang, Jianneng; Wang, Changhong; Adair, Keegan R.; Li, Junjie; Cui, Teng; Wang, Guorui; Li, Ruying; Filleter, Tobin; Cai, Mei; Sham, Tsun‐Kong; Sun, Xueliang

doi:10.1002/aenm.202001139

Cited by 39 publications

(26 citation statements)

References 43 publications

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“…In addition to in situ designed artificial SEI layers, ex situ artificial SEIs are also accepted to protect Li anodes from dendrite growth. Sun et al 43 developed a hybrid polyurea (HPU) protective film with tunable composition and improved stiffness by incorporating trimethylaluminum as a crosslinker into the polymer chains via molecular layer deposition (MLD) (Figure 3(A)). Atomic force microscopy (AFM)‐based film deflection measurements were applied to investigate the mechanical properties of MLD HPU and MLD polyurea with 10 cycles of MLD, noted as G@H10 and G@P10.…”

Section: Interfacial Instability Between Electrode and Electrolyte: Pmentioning

confidence: 99%

“…(A) Schematic of the molecular layer deposition (MLD) HPU coating on Li metal; (B) force‐deflection curve of freestanding films deflected within an elastic regime; and (C) left is force‐deflection curve of the films deflected to failure (stars indicate failure point) and right is atomic force microscopy (AFM) topography image of failed films with scale bars representing 1 μm. Reproduced with permission: Copyright 2020, Wiley‐VCH 43 . (D) Schematic of Li deposition on bare Li and graphite‐SiO 2 bilayer‐modified Li; (E) AFM topography of bare Li (top) and graphite‐SiO 2 bilayer‐modified Li (bottom); (F) Young's modulus mapping of bare Li (top) and graphite‐SiO 2 bilayer‐modified Li (bottom); and (G) contact angle measurement of bare Li (top) and graphite‐SiO 2 bilayer‐modified Li (bottom).…”

Section: Interfacial Instability Between Electrode and Electrolyte: Pmentioning

confidence: 99%

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Interface issues of lithium metal anode for high‐energy batteries: Challenges, strategies, and perspectives

Han

Liu

Xiao

et al. 2021

InfoMat

220

126

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Lithium (Li) metal is considered as one of the most promising anode materials for next‐generation high‐energy‐density storage systems. However, the practical application of Li metal anode is hindered by interfacial instability and air instability due to the highly reactivity of Li metal. Unstable interface in Li metal batteries (LMBs) directly dictates Li dendrite growth, “dead Li” and low Coulombic efficiency, resulting in inferior electrochemical performance of LMBs and even safety issues. In addition, its sensitivity to ambient air leads to the severe corrosion of Li metal anode, high requirements of production and storage, and increased manufacturing cost. Plenty of efforts in recent years have overcome many bottlenecks in these fields and hastened the practical applications of high‐energy‐density LMBs. In this review, we focus on emerging methods of these two aspects to fulfill a stable and low cost electrode. In this perspective, design artificial solid electrolyte interphase (SEI) layers, construct three‐dimensional conductive current collectors, optimize electrolytes, employ solid‐state electrolytes, and modify separators are summarized to be propitious to ameliorate interfacial stability. Meanwhile, ex situ/in situ formed protective layers are highlighted in favor of heightening air stability. Finally, several possible directions for the future research on advanced Li metal anode are addressed.

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Section: Interfacial Instability Between Electrode and Electrolyte: Pmentioning

confidence: 99%

Section: Interfacial Instability Between Electrode and Electrolyte: Pmentioning

confidence: 99%

Interface issues of lithium metal anode for high‐energy batteries: Challenges, strategies, and perspectives

Han

Liu

Xiao

et al. 2021

InfoMat

220

126

View full text Add to dashboard Cite

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“…[187] Another promising example of hybrid metal-organic MLD is the polyurea thin film coating on Li-metal anode reported by Sun et al (Figure 12c-e). [185,188] The resulting polyurea MLD coating effectively suppressed the dendritic growth during cycling and tripled the lifetime at a current density of 3 mA cm −2 .…”

Section: (18 Of 28)mentioning

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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“…[ 26,27 ] Nowadays, soluble additives and insoluble interfacial layers are effective solutions for robust SEI design that homogenizes the ionic distribution to inhibit the growth of Li dendrites. [ 21,28–32 ]…”

Section: Introductionmentioning

confidence: 99%

Marrying Ester Group with Lithium Salt: Cellulose‐Acetate‐Enabled LiF‐Enriched Interface for Stable Lithium Metal Anodes

Chen

Zheng

Liu

et al. 2021

Adv Funct Materials

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The practical applications of high‐energy‐density lithium (Li) metal batteries (LMB) have been hindered by the formation and growth of Li dendrites. Homogenizing the Li‐ion flux to suppress Li dendrites by regulating the solid electrolyte interphase (SEI) originating from electrolyte degradation is necessary but still challenging. Herein, ion‐affiliative cellulose acetate (CA) with functional Li salts is prepared to generate the SEI with fast Li+ diffusion kinetics. First, the correlations between the functional ester group and LiN(CF3SO2)2 (LiTFSI) are theoretically and experimentally identified, where CO strongly adsorbed N(CF3SO2)2− through electrostatic interaction to enhance the charge‐transfer‐promoted decomposition of LiTFSI. Furthermore, the CA with ex situ doped LiTFSI amplifies this fluorinated degradation effect, and the LiF‐enriched SEI nanostructure is consequently established in situ, as confirmed by cryogenic transmission electron microscopy. As a result, the dendritic Li growth during cycling is efficiently suppressed, and the lifespan is prolonged by more than six times at a high current density of 3 mA cm−2. This study provides insights into the interphase design for realizing ultrastable LMB.

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Tailoring the Mechanical and Electrochemical Properties of an Artificial Interphase for High‐Performance Metallic Lithium Anode

Cited by 39 publications

References 43 publications

Interface issues of lithium metal anode for high‐energy batteries: Challenges, strategies, and perspectives

Interface issues of lithium metal anode for high‐energy batteries: Challenges, strategies, and perspectives

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

Marrying Ester Group with Lithium Salt: Cellulose‐Acetate‐Enabled LiF‐Enriched Interface for Stable Lithium Metal Anodes

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