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Modelling Electrolyte Behavior in Aqueous Zinc-Ion Batteries

Borchers, Niklas and Horstmann, Birger (2020) Modelling Electrolyte Behavior in Aqueous Zinc-Ion Batteries. Electrochemistry undercover, 23.-24. Sep. 2020, Virtuell.

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Abstract

The transformation of the energy production sector is leading to a drastic increase in demand for stationary battery storage. Battery technologies are competing in the area of energy density, environmental safety, and cost per capacity. Consumer alkaline batteries with zinc anodes and manganese dioxide cathodes achieve energy densities of 440 Wh l-1, yet their development stalled due to the challenge of recharging. Changing the aqueous electrolyte from alkaline KOH to, for example, mild acidic electrolytes, however, shows a reversible charge/discharge at the cathode . This concept boosted the research interest in zinc-ion batteries in the last decade, and many promising systems were proposed. Aqueous metal batteries face a series of challenges. The dynamic electrolyte composition and pH profile heavily influence performance and unwanted side reactions. We have performed model-based optimization studies of pH adjusted electrolytes for zinc-air batteries. However, to our knowledge, there is no modelling work done for zinc-ion batteries. In this contribution, we present a thermodynamically consistent dynamic cell model, which takes into account the complex formation and related transport properties of the electrolyte. Considering this, we can predict the performance and rate-dependent behaviour of commonly used electrolyte and electrode materials. This allows us to identify system-requirements and pitfalls in the ongoing optimization of aqueous zinc-ion batteries.

Item URL in elib:https://elib.dlr.de/139364/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling Electrolyte Behavior in Aqueous Zinc-Ion Batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Borchers, Niklasniklas.borchers (at) dlr.dehttps://orcid.org/0000-0002-9618-3723
Horstmann, Birgerbirger.horstmann (at) dlr.dehttps://orcid.org/0000-0002-1500-0578
Date:2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Zinc-ion batteries, Modelling, Cell models, Aqueous Electrolytes
Event Title:Electrochemistry undercover
Event Location:Virtuell
Event Type:international Conference
Event Dates:23.-24. Sep. 2020
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries) (old)
Location: Ulm
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Bolay, Linda
Deposited On:11 Dec 2020 16:40
Last Modified:16 Dec 2020 14:45

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