What is a lithium ion battery separator?

The separators of lithium-ion batteries (LIBs) are typically porous membranes, which separate cathodes from anodes. The battery separators allow Li-ion transport through the porous membranes, but must be electronically insulated.

What makes a good lithium-ion battery separator?

The ideal lithium-ion battery separator should possess good electronic insulation, appropriate pore size and porosity, chemical and electrochemical stability, excellent wettability, mechanical strength, thermal stability, and high safety.

Do lithium-ion batteries need a high safety separator?

A high safety separator is essential to improve the safety of lithium-ion batteries. This review summarizes its performance requirements and preparation methods. All the separator requirements have a synergistic effect on the electrochemical performance, safety, and scalability of lithium-ion batteries.

Are polyolefin separators bad for lithium-ion batteries?

Poor electrolyte wettability, nasty heat shrinkage and severe dendrite-growth issues of commonly used polyolefin separators significantly hamper further application and improvement of energy-density for lithium-ion batteries (LIBs).

Can a cellulose-based separator encapsulate lithium-ion batteries?

Herein, we design a green, cellulose-based separator (Cel@DBDPE) with a unique encapsulation structure for lithium-ion batteries, in which functional flame retardants (DBDPE) are wrapped in microscrolls formed by the self-rolling of 2D cellulose nanosheets upon freeze-drying.

What type of separator is used for Li-ion batteries?

Polymer-based separators are the most common separators used for liquid Li-ion batteries. They can be categorized into four main classes: microporous polyolefins separators, non-woven separators, modified microporous separators, and composite microporous separators.