Spontaneous and field-induced crystallographic reorientation of metal electrodeposits at battery anodes

Science Advances, Journal Year: 2020, Volume and Issue: 6(25)

Published: June 17, 2020

The propensity of metal anodes contemporary interest (e.g., Li, Al, Na, and Zn) to form non-planar, dendritic morphologies during battery charging is a fundamental barrier achievement full reversibility. We experimentally investigate the origins electrodeposition Zn, Cu, Li in three-electrode electrochemical cell bounded at one end by rotating disc electrode. find that classical picture ion depletion-induced growth dendrites valid dilute electrolytes but essentially irrelevant concentrated (≥1 M) typically used rechargeable batteries. Using Zn as an example, we depletion mass transport limit may be overcome spontaneous reorientation crystallites from orientations parallel electrode surface dominantly homeotropic orientations, which appear facilitate contact with cations outside layer. This chemotaxis-like process causes obvious texturing increases porosity electrodeposits.

Language: Английский

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Stabilization Perspective on Metal Anodes for Aqueous Batteries

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 11(2)

Published: May 12, 2020

Abstract Aqueous electrolyte‐based batteries have attracted increasing attention because of nonflammability, low cost, high power density, and environmental friendliness. However, the energy density aqueous lithium‐ion caused by narrow stable electrochemical window water electrode materials with capacity severely limits their further development. In this regard, development metal anodes specific shows excellent prospects. For example, zinc aluminum theoretical capacity, rich resources, friendliness, can be used as promising for high‐energy‐density rechargeable batteries. Unfortunately, usually face balance issues regard to stability activity associated dendrite growth undesired side reactions in water‐based electrolytes, which is still a great challenge review, various including metal–air are summarized highlighted. Recent advances design high‐safety electrolytes strategies anode protection comprehensively reviewed. addition, emerging challenges some perspectives on included.

Language: Английский

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Tutorial review on structure – dendrite growth relations in metal battery anode supports

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 49(20), P. 7284 - 7300

Published: Jan. 1, 2020

This tutorial review explains the emerging understanding of surface and bulk chemistry - electrochemical performance relations in anode supports (aka secondary current collectors, substrates, templates, hosts) for lithium, sodium potassium metal batteries (LMBs, SMBs or NMBs, KMBs PMBs). In relation to each section, possible future research directions that may yield both new insight improved cycling behavior are explored. Representative case studies from Li, Na K literature discussed. The starts with an overview solid electrolyte interphase (SEI), covering "classic" SEI structure "modern" insights obtained by site-specific cryogenic stage TEM analysis. Next, multiple roles promoting stability detailed. Without optimized support architecture, metal-electrolyte interface becomes geometrically unstable at a lower density cycle number. Taking into consideration available on LMBs, KMBs, it is concluded effective architectures complex electrochemically lithiophilic, sodiophilic potassiophilic, so as promote conformal wetting during plating/stripping. One way philicity achieved through oxygen chemistry, which yields reversibly reactive metal-support interface. Examples this include well-known oxygen-carbon moieties reduced graphene oxide (rGO), well classic ion battery reversible conversion reaction oxides such SnO2. Unreactive surfaces lead dewetted island growth metal, precursor dendrites, possibly non-uniform dissolution. Surveying various supports, key thermodynamic property will predict enthalpy infinite solution (ΔsolH∞) (solute) (solvent). Large negative ΔsolH∞ promotes uniform surface, corresponding relatively low plating overpotential. Positive islands high simple rule broad range interactions, including previously reported correlation between mutual solubility wetting.

Language: Английский

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Recently advances and perspectives of anode-free rechargeable batteries

Nano Energy, Journal Year: 2020, Volume and Issue: 78, P. 105344 - 105344

Published: Sept. 2, 2020

Language: Английский

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Achieving Ultrahigh‐Rate Planar and Dendrite‐Free Zinc Electroplating for Aqueous Zinc Battery Anodes

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(28)

Published: May 13, 2022

Despite being one of the most promising candidates for grid-level energy storage, practical aqueous zinc batteries are limited by dendrite formation, which leads to significantly compromised safety and cycling performance. In this study, using single-crystal Zn-metal anodes, reversible electrodeposition planar Zn with a high capacity 8 mAh cm-2 can be achieved at an unprecedentedly current density 200 mA . This dendrite-free electrode is well maintained even after prolonged (>1200 cycles 50 ). Such excellent electrochemical performance due suppressing major sources defect generation during electroplating heavily favoring deposition morphologies. As so few sites form, including those that would normally found along grain boundaries or accommodate lattice mismatch, there little opportunity dendritic structures nucleate, under extreme plating rates. scarcity defects in part perfect atomic-stitching between merging islands, ensuring no defective shallow-angle formed thus removing significant source non-planar nucleation. It demonstrated ideal high-rate anode should offer matching as facilitates epitaxial growth minimizes formation any regions.

Language: Английский

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