Ion Redistribution and Rapid-Transfer Composite Protective Layer for Stable Lithium Metal Anodes

Shi, Jinqiang; Ma, Mingyue; Wang, Rui; Bao, Junquan; Tao, Zhanliang

doi:10.1021/acsaem.0c00020

Cited by 13 publications

(9 citation statements)

References 33 publications

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“…S12 and Table S1. † 17,[37][38][39][40][41][42][43][44][45][46] Similar enhancement was achieved in LiCoO 2 ||Li full cells. The lithium anode here was adopted by pre-deposition of Li on SiO 2 @PDA-Cu and bare Cu as anodes.…”

Section: Resultssupporting

confidence: 62%

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

et al. 2022

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Section: Resultssupporting

confidence: 62%

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

et al. 2022

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“…The compact section view of Li deposition on LTO@Cu substrate further confirms the unique “inverse concentration gradient” of the LTO layer can effectively inhibit the lithium dendrite growth and stabilize the lithium metal anode interface. [ 16a,28 ]…”

Section: Resultsmentioning

confidence: 99%

“…The contact angle of the electrolyte and LTO@Cu is about 10° (Figure 1e), much smaller than that of bare Cu (Figure 1f), indicating that the modified coating layer exhibits better wettability with electrolyte and the transfer of Li + ions will be enhanced significantly. [ 16 ]…”

Section: Resultsmentioning

confidence: 99%

Li₄Ti₅O₁₂ Coating on Copper Foil as Ion Redistributor Layer for Stable Lithium Metal Anode

Xiong

Yan

Zhu

et al. 2022

Advanced Energy Materials

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energy density. Owing to the ultrahigh theoretical specific capacity (3860 mAh g −1 ) and the lowest electrochemical potential (−3.04 V vs standard hydrogen electrode), lithium metal has become the most promising anode material to support the development of advanced energy storage system. [1] However, the low coulombic efficiency, short cycling lifespan and potential safety risks caused by the unstable electrode interface hinder its practical application. [2] Under practical condition, owing to the side reactions between high reactive lithium metal and electrolyte, a solid electrolyte interface (SEI) forms on lithium metal surface spontaneously, which could passivate the lithium metal to prevent further troublesome side reactions and endure sharp potential drop at the electrode interface. [3] However, the actual SEI is characterized by inhomogeneous composition and low mechanical strength, which results in uneven Li + ions distribution at the electrode interface, leading to non-uniform lithium deposition/stripping behavior, irreversible consumption of active lithium and electrolyte and the growth of lithium dendrites. [4] Therefore, stabilizing the electrode interface to ensure the uniform lithium deposition is of great importance for the practical application of lithium metal anode. [5] Many approaches have been developed in attempts to solve the risky interface problems related to lithium metal anode, which can be divided into 4 aspects: (1) Constructing stable SEI by modifying liquid electrolyte, which mainly includes the application of novel solvent, lithium salt and concentrated electrolyte. [6] Nevertheless, the mechanical strength of the SEI formed in situ is not strong enough to inhibit the lithium dendrite owing to the unaltered heterogeneous structure. Furthermore, under continuous irreversible consumption, the limited additives are not enough to sustain a long stable cycling lifespan. (2) Solid electrolyte is characterized by high mechanical strength and could reduce the safety risk of lithium metal anode greatly by eliminating flammable liquid electrolyte. [7] However, the application of solid electrolyte is still challenged by their low ionic conductivity and poor interface contact with electrode. (3) Employing composite electrode by using conductive materials or three-dimensional current collector has received much attention. It can reduce the local current density via ultrahigh electrode specific surface area to suppress lithium Lithium metal is regarded as the most promising electrode material for the next generation of energy storage devices. However, low coulombic efficiency and short cycle lifespan caused by the unstable electrode interface have hindered its practical application. Constructing artificial coatings on the anode is one of the most effective approaches for remedying this, but the practical effects are still limited due to their poor regulation of Li + ions transport and complex construction engineering. Herein, an "inverse concentration gradient" concept is put forward to im...

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“…As a result, previous studies have typically adopted polymer protective layers with thicknesses on a scale of micrometers. [ 37–41 ]…”

Section: Introductionmentioning

confidence: 99%

“…As a result, previous studies have typically adopted polymer protective layers with thicknesses on a scale of micrometers. [37][38][39][40][41] This issue has been addressed in recent studies by developing protective interfacial layers composed of polymers with a conjugated structure that improve the cycling stability of Limetal batteries by means of a Li storage mechanism rather than by their mechanical properties. [42][43][44][45][46] Here, Li ions react with the polymer, and the Li ions become fixed when the battery is discharged.…”

mentioning

confidence: 99%

Influence of Polymer Interfacial Protective Layer Thickness on the Stability of Lithium‐Metal Batteries

Yang

et al. 2022

Adv Materials Inter

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utilized to improve both the flexibility and the long-term cycling stability of Li-metal batteries. [9][10][11][12][13][14][15][16][17] One of the more promising strategies applied in recent years for this purpose involves the design of polymer interfacial protective layers for use with copper (Cu) anodes. [18][19][20][21][22][23][24][25][26][27][28] This strategy is greatly facilitated by the easy processing, inherent flexibility, and function group design capabilities of polymer materials. Accordingly, this strategy has been the focus of numerous studies.Among the many examples of efforts to develop polymer-based interfacial protective coatings, Zheng et al. [29] applied a highly viscoelastic polymer coating to Cu-metal electrodes, and thereby significantly improved the cycling stability of Li-metal batteries at high current densities. Similarly, Zhu et al. [30] applied a modified poly(dimethylsiloxane) film with nanopores as a protective layer that was demonstrated to suppress Li dendrite growth owing to its chemical inertness and mechanical properties. The mechanical properties of insulating polymer protective layers have similarly been identified as the primary mechanism suppressing Li dendrite growth. [31][32][33][34][35] However, an ideal polymer protective layer must be as thin as possible for effective use in flexible battery applications, and this introduces problems when relying on the mechanical properties of polymer films to inhibit Li dendrite growth because thin films are inherently weak. For example, Kong et al. [36] reported simulation results demonstrating that thick polymer protective layers can reduce the mobility and deposition rates of Li ions. However, any random Li dendrite is able to penetrate thin polymer layers, and thereby disrupt the inhibitory effect of the film. As a result, previous studies have typically adopted polymer protective layers with thicknesses on a scale of micrometers. [37][38][39][40][41] This issue has been addressed in recent studies by developing protective interfacial layers composed of polymers with a conjugated structure that improve the cycling stability of Limetal batteries by means of a Li storage mechanism rather than by their mechanical properties. [42][43][44][45][46] Here, Li ions react with the polymer, and the Li ions become fixed when the battery is discharged. Subsequently, the fixed Li ions are restored to the initial Li source, which promotes the continuous deposition of Li in the vicinity. However, while polymers with conjugated structures provide the possibility of designing protective layers with nanoscale thicknesses, the influence of important film Protective layers formed of polymers with conjugated structures have been demonstrated to improve the cycling stability of lithium (Li)-metal batteries by reducing Li dendrite growth. However, the influence of important film parameters, such as thickness and ionic conductivity, remains largely unexplored. The present work addresses this issue by investigating the influence of film thickness for elect...

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Ion Redistribution and Rapid-Transfer Composite Protective Layer for Stable Lithium Metal Anodes

Cited by 13 publications

References 33 publications

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

Li₄Ti₅O₁₂ Coating on Copper Foil as Ion Redistributor Layer for Stable Lithium Metal Anode

Influence of Polymer Interfacial Protective Layer Thickness on the Stability of Lithium‐Metal Batteries

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Ion Redistribution and Rapid-Transfer Composite Protective Layer for Stable Lithium Metal Anodes

Cited by 13 publications

References 33 publications

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

Regulating Li-ion flux with a high-dielectric hybrid artificial SEI for stable Li metal anodes

Li4Ti5O12 Coating on Copper Foil as Ion Redistributor Layer for Stable Lithium Metal Anode

Influence of Polymer Interfacial Protective Layer Thickness on the Stability of Lithium‐Metal Batteries

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Li₄Ti₅O₁₂ Coating on Copper Foil as Ion Redistributor Layer for Stable Lithium Metal Anode