Water‐Repellent Ionic Liquid Skinny Gels Customized for Aqueous Zn‐Ion Battery Anodes

Despite the enormous potential of aqueous zinc (Zn)‐ion batteries as a cost‐competitive and safer power source, their practical applications have been plagued by the chemical/electrochemical instability of Zn anodes with aqueous electrolytes. Here, ionic liquid (IL) skinny gels are reported as a new...

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Vydáno v:Advanced functional materials Ročník 31; číslo 36
Hlavní autoři: Lee, Donggue, Kim, Hong‐I, Kim, Won‐Yeong, Cho, Seok‐Kyu, Baek, Kyungeun, Jeong, Kihun, Ahn, David B., Park, Sodam, Kang, Seok Ju, Lee, Sang‐Young
Médium: Journal Article
Jazyk:angličtina
Vydáno: Hoboken Wiley Subscription Services, Inc 01.09.2021
Témata:
Anode effect
Anodic protection
Aqueous electrolytes
aqueous Zn‐ion batteries
Conduction
Customization
Discharge
electrode‐customized electrolytes
Gels
ionic liquid skinny gels
Ionic liquids
Ions
Manganese dioxide
Materials science
Power sources
Redox reactions
Water chemistry
water‐repellent ion‐conducting protective layers
Zinc salts
Zn anodes
ISSN:1616-301X, 1616-3028
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Shrnutí:Despite the enormous potential of aqueous zinc (Zn)‐ion batteries as a cost‐competitive and safer power source, their practical applications have been plagued by the chemical/electrochemical instability of Zn anodes with aqueous electrolytes. Here, ionic liquid (IL) skinny gels are reported as a new class of water‐repellent ion‐conducting protective layers customized for Zn anodes. The IL skinny gel (thickness ≈500 nm), consisting of hydrophobic IL solvent, Zn salts, and thiol‐ene polymer compliant skeleton, prevents the access of water molecules to Zn anodes while allowing Zn2+ conduction for redox reactions. The IL‐gel‐skinned Zn anode enables sustainable Zn plating/stripping cyclability under 90% depth of discharge (DODZn) without suffering from water‐triggered interfacial parasitic reactions. Driven by these advantageous effects, a Zn‐ion full cell (IL‐gel‐skinned Zn‐anode||aqueous‐electrolyte‐containing MnO2 cathode) exhibits high charge/discharge cycling performance (capacity retention ≈95.7% after 600 cycles) that lies beyond those achievable with conventional aqueous Zn‐ion battery technologies. Ionic liquid (IL) skinny gels are presented as a water‐repellent ion‐conducting protective layer customized for aqueous Zn‐ion battery anodes. The IL‐gel‐skinned Zn anode allows sustainable Zn plating/stripping behavior without water‐triggered interfacial parasitic reactions, thus enabling an aqueous Zn/MnO2 full cell to exhibit a high charge/discharge cycling performance (capacity retention ≈95.7% after 600 cycles).
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202103850