Journal
NANO RESEARCH
Volume 15, Issue 4, Pages 3187-3194Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3911-0
Keywords
elevated kinetics; passivated Fe anodes; NH4Cl regulator; cathode-free design; Fe-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51802269]
- Fundamental Research Funds for the Central Universities [XDJK2020C057, SYJ2021011]
- Venture & Innovation Support Program for Chongqing overseas returnees [cx2018027]
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The study focuses on using NH4Cl as an electrolyte regulator to improve the reaction kinetics of passivated Fe anodes, and proposes a special cathode-free design to extend battery lifespan. The configured Fe-ion cells exhibit good environmental benignity and excellent energy storage behaviors, showing potential for future energy-storage power stations.
The environment benignity and battery cost are major concerns for grid-scale energy storage applications. The emerging dendrite-free Fe-ion aqueous batteries are promising due to the rich natural abundance, low cost and non-toxicity for Fe resources. However, serious passivation reactions on Fe anodes and poor long-term cyclability for matched cathodes still stand in the way for their practical usage. To settle above constraints, we herein use NH4Cl as the electrolyte regulator to elevate the reaction kinetics of passivated Fe anodes, and also propose a special cathode-free design to prolong the cells lifetime over 1,000 cycles. The added NH4Cl can erode/break inert passivation layers and strengthen the ion conductivity of electrolytes, facilitating the reversible Fe plating/stripping and Fe2+ shuttling. The highly puffed nano carbon foams function as current collectors and actives anchoring hosts, enabling expedite Fe2+ adsorption/desorption, Fe-II/Fe-III redox conversions and Fe-III deposition. The configured rocking-chair Fe-ion cells have good environmental benignity and decent energy-storage behaviors, including high reactivity/reversibility, outstanding cyclic stability and far enhanced operation longevity. Such economical, long-cyclic and green cathode-free Fe-ion batteries may hold great potential in near-future energy-storage power stations.
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