Can ion-selective separators be used in next-generation lithium-ion batteries?

In order to achieve the stability level of thousands of cycles for state-of-the-art commercial lithium-ion batteries, ion-selective separators can be implemented in the described next-generation battery systems for their important role in retaining the active materials and stabilizing the solid–electrolyte interface.

What is a lithium ion battery separator?

Generally, the separator is the inactive component of the battery. The electrode materials as additives in the separator can participate in the electrochemical reaction and boost the electrochemical performance of LIBs.

What is a 'smart' lithium separator?

On the other hand, separators with improved wetting capability or thermal conductivity suppress the lithium dendrite growth when the lithium metal anode is applied, lowering the safety hazards. ‘Smart’, the third criterion of the 4S separators, represents a future direction for developing advanced battery-management systems.

Why do we need a functional separator for lithium based batteries?

Besides, particularly for lithium-based batteries, the lithium dendrites, which result from the uneven electrodeposition of lithium metal on the anode, may pierce through the porous separator to cause internal short circuit. Thus, functional separators that enhance homogeneous electrochemical reactions on the anode surface reduce the safety risk.

Are functional separators suitable for next-generation high-energy rechargeable batteries?

Herein, functional separators are overviewed based on four key criteria of next-generation high-energy rechargeable batteries: stable, safe, smart and sustainable (4S). That is, the applied membrane materials and the corresponding functioning mechanisms of the 4S separators are reviewed.

Why is a Lithium Ion Separator important?

As a key component of LIBs, the separator plays a crucial role in sequestering the electrodes, preventing direct contact between the positive and negative electrodes, and allowing the free passage of lithium ions in the electrolyte. Additionally, the separator is also crucial for ensuring the safe operation of the batteries.