Towards separator safety of lithium-ion batteries: a review

Abstract

The recent advance of high-safety separators with high mechanical strength, high thermal stability and good lithium dendritic resistance is the main focus in this review. The future challenges and perspectives of separators are provided for building high safety rechargeable lithium batteries.

In situ polymerization of solid-state polymer electrolytes for lithium metal batteries: a review

“…In addition, the separator used in this method increases the self-weight and inert ion-conducting region of SPEs. Typically the separators are composed of cellulose, 94 PVDF, 95 glass fiber, 96 and polyolefins. 97 These septa are inert and generally do not participate in the ionic conduction process.…”

Tuning Surface Energy of Pristine Separator with γ-AlO(OH) Nanocapsules for Inhibiting Lithium Polysulfide Shuttle and Lithium Dendrite Growth

“…The modification of the separator is another route for mitigating polysulfide shuttling. Metal oxides/sulfides such as Al 2 O 3 , TiO 2 , ZnO, MoS 2 , and various polymer and carbon materials are used for coating on top of the separator which can efficiently mitigate the polysulfide shuttling. − Similarly, methods for restraining Li dendrite growth have included various protective coatings on top of the Li metal and additives to stabilize the solid electrolyte interphase. − Newer approaches toward countering Li dendrite formation have included coating sugar on top of Li metal, biomacromolecule interlayers, and immunizing Li metal with protein molecules. − Modified ceramic separators have also been used to suppress dendritic growth mechanically. − Graphene, graphene oxide, polydopamine, and plant leaf-inspired separators have also shown considerable improvement in halting dendritic growth. − …”

Preparation and performance of polyimide lithium‐ion battery separator based on benzonorbornene main chain structure

“…Traditionally, polyolefin separators were used on a large scale, mainly including polypropylene (PP, melting point of 160°C), polyethylene (PE, melting point 130°C), and composite separators 19–23 . These materials have poor thermal dimensional stability and electrolyte wettability due to the nonpolar nature of their structure and low melting point, 24–27 which cause lithium‐ion batteries to undergo a violent chemical reaction and release a large amount of heat during operation, leading to safety problems 28–30 . Therefore, it is particularly significant to develop a material with better thermal dimensional stability and electrolyte wettability.…”