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Related Concept Videos

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...

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Single- to Few-Layer Nanoparticle Cathode Coating for Thiophosphate-Based All-Solid-State Batteries.

Yuan Ma, Ruizhuo Zhang, Yushu Tang

  • 1Helmholtz Institute Ulm (HIU) for Electrochemical Energy Storage, Helmholtzstr. 11, 89081 Ulm, Germany.

ACS Nano
|October 25, 2022
PubMed
Summary

A novel protective hafnium oxide coating on nickel-rich cathode active materials significantly enhances solid-state battery performance by preventing detrimental side reactions, improving capacity and longevity.

Keywords:
Ni-rich cathodeargyrodite solid electrolyteelectro-chemo-mechanical degradationsecondary particle coatingsolid-state battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state batteries (SSBs) are promising for next-generation energy storage.
  • Compatibility issues between cathode active materials (CAMs) and solid electrolytes (SEs) hinder SSB performance.
  • Lithium thiophosphate superionic solid electrolytes and high-capacity CAMs are key components.

Purpose of the Study:

  • To develop a protective coating for CAMs to mitigate side reactions with SEs.
  • To improve the electrochemical performance and stability of SSBs.
  • To demonstrate the adaptability of the coated CAM in different battery configurations.

Main Methods:

  • Coating LiNi0.85Co0.1Mn0.05O2 (NCM85) CAM with preformed HfO2 nanoparticles.
  • Fabricating pellet-stack SSBs using Li6PS5Cl solid electrolyte.
  • Characterizing the coated NCM85 using physical and electrochemical techniques.
  • Testing coated NCM85 in slurry-cast SSBs and liquid-electrolyte Li-ion cells.

Main Results:

  • A uniform HfO2 coating (≤11 nm) was successfully deposited on NCM85.
  • SSBs with coated NCM85 exhibited superior reversibility, capacity, longevity, and rate capability.
  • The coating effectively mitigated electro-chemo-mechanical degradation.
  • Coated NCM85 demonstrated adaptability to wet processing.

Conclusions:

  • HfO2 nanoparticle coating is an effective strategy to enhance SSB performance.
  • The protective coating addresses critical CAM-SE compatibility issues.
  • This approach shows potential for scalable manufacturing of advanced batteries.