Abstract
In recent years, the applications of lithium-ion batteries have emerged promptly owing to its widespread use in portable electronics and electric vehicles. Nevertheless, the safety of the battery systems has always been a global concern for the end-users. The separator is an indispensable part of lithium-ion batteries since it functions as a physical barrier for the electrode as well as an electrolyte reservoir for ionic transport. The properties of separators have direct influences on the performance of lithium-ion batteries, therefore the separators play an important role in the battery safety issue. With the rapid developments of applied materials, there have been extensive efforts to utilize these new materials as battery separators with enhanced electrical, fire, and explosion prevention performances. In this review, we aim to deliver an overview of recent advancements in numerical models on battery separators. Moreover, we summarize the physical properties of separators and benchmark selective key performance indicators. A broad picture of recent simulation studies on separators is given and a brief outlook for the future directions is also proposed.
Highlights
Received: 14 December 2020Pioneered by Yoshino in 1985 [1,2], lithium-ion (Li-ion) batteries have been commercialized and used ever since in the industry as an alternative source of energy
The internal short while serving as the electrolyte reservoir to enable ionic transport
The ideal separator should have large electrolyte uptake for lowering the cell internal ideal separator should have large electrolyte uptake for lowering the cell internal resistance and have extremely thin thickness with strong mechanical strength, being resistance and have extremely thin thickness with strong mechanical strength, being electrochemically and structurally stable, as well as having a highly porous structure with electrochemically and structurally stable, as well as having a highly porous structure with great tortuosity to prevent the growth of dendritic lithium
Summary
Pioneered by Yoshino in 1985 [1,2], lithium-ion (Li-ion) batteries have been commercialized and used ever since in the industry as an alternative source of energy. It is usually applied as an energy storage reservoir for renewable energies and commonly used in portable electronics and electric vehicles. A Li-ion battery is less thermally stable in comparison with other battery systems. This has caused a significant amount of battery fires in recent years, which occurred in mobile phones, electric vehicles, and airplanes [3,4,5,6]. There are no direct cell reactions in the separator, but the structure and properties of the separator play an essential role in determining the battery performance, including cycle life, safety, energy density, and power density, through influencing the cell kinetics [8]
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