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Multifunctional ionic liquid-assisted interfacial engineering towards ZnS nanodots with ultrastable high-rate lithium
Min Cheng1, Qian-Qian Hu1, Jian-Rong Li2
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P.R. China. xyhuang@fjirsm.ac.cn.
Dalton Transactions (Cambridge, England : 2003)
|October 5, 2021
Summary
A novel zinc ionic liquid ([HMMIm]2[ZnCl4]) enables controlled synthesis of zinc sulfide nanodots (ZnS NDs). This strategy yields a nanocomposite for high-performance lithium-ion batteries (LIBs).
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Developing advanced anode materials is crucial for enhancing lithium-ion battery (LIB) performance.
- Controlling the synthesis of metal sulfide nanostructures, like zinc sulfide (ZnS) nanodots (NDs), is challenging.
- Ionic liquids (ILs) offer potential as versatile media for nanomaterial synthesis and interfacial engineering.
Purpose of the Study:
- To design a novel zinc-containing ionic liquid ([HMMIm]2[ZnCl4]) for interfacial engineering of ZnS nanodots (NDs).
- To synthesize a nanocomposite of ZnS NDs anchored on sulfur/nitrogen dual-doped reduced graphene oxide (ZnS-NDs@SNG).
- To evaluate the performance of the synthesized nanocomposite as an anode material for LIBs.
Main Methods:
- Design and synthesis of a new zinc-containing ionic liquid, [HMMIm]2[ZnCl4].
- Utilizing the IL for interfacial engineering to control the formation of ZnS nanodots (NDs).
- Preparation of a nanocomposite (ZnS-NDs@SNG) by anchoring ZnS NDs onto dual-doped reduced graphene oxide.
- Electrochemical testing of the nanocomposite as an anode material for LIBs.
Main Results:
- The designed IL ([HMMIm]2[ZnCl4]) effectively controlled the formation of homodispersed ZnS NDs.
- The resulting ZnS-NDs@SNG nanocomposite exhibited high reversible specific capacity and excellent high-rate performance.
- Exceptional cycling stability was demonstrated, with a discharge capacity of 648.1 mA h g⁻¹ maintained over 5000 cycles at 10.0 A g⁻¹.
Conclusions:
- The IL-assisted interfacial engineering strategy provides a new avenue for controllable synthesis of metal-sulfide anode materials.
- The synthesized ZnS-NDs@SNG nanocomposite shows significant promise as a high-performance anode material for LIBs.
- This approach facilitates the development of next-generation energy storage solutions.
