A review of Functional Separators for Lithium Metal Battery Applications

2018
,
54
, 17–25. [
CrossRef
]
Publisher’s Note:
MDPI stays neutral with regard to jurisdictional claims in published maps and institutional
a
ffi
liations.
©
2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access
article distributed under the terms and conditions of the Creative Commons Attribution
(CC BY) license (http:
//
creativecommons.org
/
licenses
/
by
/
4.0
/
).

---

Document Outline

• Introduction 
• Properties of the Separator 
  • Thickness 
  • Porosity 
  • Wettability 
  • Ionic Conductivity 
  • Chemical and Electrochemical Stability 
  • Thermal Stability 
  • (Thermal) Dimensional Stability 
  • Mechanical Properties 
  • Preventing Shuttle Effects 
• Limitations of Commercial Separators in Lithium Metal Batteries 
• Various Materials for Modifying Multifunctional Separators 
  • Using the Advantages of Ceramic Compounds 
    • Silica (SiO2) 
    • Alumina (Al2O3) 
  • Using the Advantages of Metal and Metal Composites 
    • Metal 
    • Metal Oxide (MO) 
    • Transition Metal Dichalcogenide 
  • Using the Advantages of Carbon-Based Materials 
    • Carbon 
    • Graphene 
    • Graphene Oxide (GO) 
  • Using the Advantages of Other Materials 
    • Nitrides (N) 
    • Phosphorus (P) 
• Real Cases of Modifying Separators for Li-Metal Based Batteries 
  • Separators for LMBs 
    • Strategies for Improving Ionic Conductivity of Separators 
    • Strategies for Improving Mechanical Strength of Separators 
    • Strategies for Improving Thermal Stability of Separators 
    • Strategies for Stabilization of Li-Metal 
    • Separators Made from Non-Toxic and Sustainable Processes 
  • Separators for LSBs 
    • Strategies for Suppressing Shuttle Effects by Chemical Methods 
    • Strategies for Suppressing Shuttle Effects by Physical Methods 
• Hybridized Use of Electrolytes and Separators: Solid and Gel Polymer Electrolytes 
  • Interfacial Resistance and Instability Resulting in Low Capacities 
  • Modified SEs 
    • Composite SEs 
    • Artificial Interface Layers between Li-Metal Anodes and Electrolytes 
  • Modified GPEs: Strategies to Enhance the Function of Separators 
• Conclusions 
• References