MANA High Temperature Battery Separator

MANA is a new class of hybrid polymer battery separators for lithium-ion batteries, developed with controllable porosity, conductivity, and excellent thermal stability (up to 250°C)

Lithium-ion (Li-ion) battery safety remains a significant concern, as li-ion battery damage can lead to fires and explosion failures. When a li-ion battery is damaged, ruptures can lead to the ejection of hazardous materials, and rapid heat release can cause propagation from cell to cell resulting in a total catastrophic failure event. This thermal runaway is the major cause of fires attributed to li-ion batteries.

Current battery technologies use polyolefin-based separator technology, which can shrink, melt, crack, split, and burn under certain conditions. In contrast, separators made of more thermally stable materials can prevent these effects. Safety has been a limiting factor in adopting li-ion batteries by defense aviation and space industries. However, safer, high-energy-density lithium-ion batteries are considered critical for future developments in aviation, defense, transportation, and more.

Oceanit is developing MANA’s nanofiber manufacturing method to enable a 50% increase in separator porosity and ionic conductivity, endowing MANA with superior thermal stability, durability, wettability, and ionic conductivity over standard tri-layer polyolefin separators.

At <160°C, current commercially-available battery separators completely melt and shrink, causing a complete thermal runaway failure. At temperatures surpassing 200°C, the MANA separator is still intact, even after a complete battery meltdown. Mana does not melt and does not catch fire, staying intact up to 250°C.

Key Features

  • High-temperature melt integrity (250 °C) provides thermal stability in extreme environments
  • Nanostructured separator with excellent resistance to acids, bases & solvents
  • Oxidation resistance for excellent cycling and trickle charge performance
  • Highly porous nanostructure enables rapid wettability and high electrolyte retention
  • Low electrical impedance and high porosity provides high-rate capabilities

In addition, Oceanit is looking to leverage Oceanit membrane technology into other ion-selective technologies. The MANA high-temperature membrane can be utilized in any battery that requires superior safety.

Ions flow from the anode to the cathode, across a separator, as the battery discharges energy.