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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Li Alginate-Based Artificial SEI Layer for Stable Lithium Metal Anodes.

Yicheng Zhong1,2, Yuanmao Chen1,2, Yifeng Cheng1,2

  • 1School of Materials and Energy , Guangdong University of Technology , Guangzhou 510006 , China.

ACS Applied Materials & Interfaces
|September 25, 2019
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Summary

Researchers developed a stable lithium alginate-based artificial solid electrolyte interface (ASEI) for lithium metal anodes (LMAs). This ASEI layer enhances battery performance by enabling stable lithium plating/stripping and suppressing dendrite growth.

Keywords:
Li alginateLi plating/strippingartificial SEI layerhigh-energy batterieslithium metal anodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal anodes (LMAs) are crucial for high-energy-density batteries like Li-S and Li-O2.
  • The native solid electrolyte interface (SEI) on LMAs is often fragile, leading to poor cycling stability, low coulombic efficiency (CE), and safety concerns due to lithium dendrites.
  • Developing stable LMAs is essential for advancing next-generation battery technologies.

Purpose of the Study:

  • To engineer a chemically stable artificial SEI (ASEI) layer for lithium metal anodes.
  • To improve the stability of lithium plating and stripping processes on LMAs.
  • To enable high-performance and safe lithium metal batteries.

Main Methods:

  • Fabrication of a lithium alginate-based artificial SEI (ASEI) layer on LMAs.
  • Electrochemical testing of ASEI-protected LMAs in symmetric Li||Li cells.
  • Evaluation of LiFePO4||Li full cells utilizing ASEI-protected LMAs.

Main Results:

  • The ASEI layer demonstrated chemical stability and facilitated efficient Li+ ion transport.
  • ASEI-protected LMAs exhibited stable Li plating/stripping with effective dendrite suppression.
  • Symmetric Li||Li cells operated stably for 850 h (0.5 mA cm-2) and 350 h (1 mA cm-2).
  • LiFePO4||Li full cells showed 94.0% capacity retention and 99.6% CE after 1000 cycles at 4 C.

Conclusions:

  • The engineered ASEI layer provides a promising approach for stabilizing LMAs.
  • This stabilization is key to unlocking the potential of high-performance lithium metal batteries.
  • The study offers a new strategy for overcoming critical challenges in LMA technology.