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Electrolysis03:00

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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The Regulation of Solid Electrolyte Interphase on Composite Lithium Anodes in Solid-State Batteries.

Zi-You Wang1,2, Chen-Zi Zhao3, Nan Yao3

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.

Angewandte Chemie (International Ed. in English)
|October 9, 2024
PubMed
Summary

Composite anodes create a stable solid electrolyte interphase (SEI) for solid-state lithium metal batteries. This innovation enhances cycling stability and safety in next-generation energy storage devices.

Keywords:
composite electrodeslithium metal anodessolid electrolyte interphasessolid polymer electrolytessolid-state lithium metal batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state lithium metal batteries (SSLMBs) offer improved safety and energy density over conventional batteries.
  • Instability of the solid electrolyte interphase (SEI) at the lithium metal/solid polymer electrolyte (SPE) interface hinders long-term cycling performance.

Purpose of the Study:

  • To investigate the formation and impact of SEI layers on lithium and composite lithium anodes in SSLMBs.
  • To evaluate the electrochemical performance and safety of SSLMBs utilizing composite anodes.

Main Methods:

  • Fabrication and characterization of lithium anodes (l-SEI) and composite lithium anodes (c-SEI).
  • Assembly of full cells and pouch cells using solid polymer electrolytes.
  • Electrochemical cycling tests at high areal capacity and safety assessments (curling, cutting).

Main Results:

  • Composite anodes (c-SEI) form a uniform Li2S-rich inorganic SEI and a thinner organic SEI layer.
  • The robust SEI layer effectively passivates the interface, enhancing cycling stability.
  • Full cells with c-SEI anodes achieved over 400 cycles at 0.5 C with 2.0 mAh cm−2 areal capacity.
  • Reversible high-loading solid-state pouch cells demonstrated exceptional safety.

Conclusions:

  • Composite anodes with tailored SEI layers are crucial for improving the cycling stability of SSLMBs.
  • The developed c-SEI strategy offers a promising pathway for next-generation solid-state polymer-based lithium metal batteries.
  • Enhanced interface stability is key to unlocking the full potential of high-energy-density solid-state batteries.