Novel Composite Anode Materials for Sodium Ion Batteries

Physical Sciences : Materials and Compounds

Available for licensing

Inventors

  • Arumugam Manthiram, Ph.D. , Mechanical Engineering
  • Il Tae Kim, Ph.D. , Texas Materials Institute
  • Eric Allcorn , Texas Materials Institute

Background/unmet need

Sodium-ion batteries have used the carbonaceous materials as anodes. However, carbon anode has certain limitations, such as limited gravimetric capacity (100-300 mAh/g at very low current density such as C/80); plating of sodium due to the operating voltage close to that of metallic sodium and formation of solid-electrolyte interfacial (SEI) layers, resulting in safety concerns; and poisoning by dissolved manganese leached from sodium manganese oxide cathodes that lead to poor cycle life of cells fabricated with manganese cathodes and sodium anodes.

Invention Description

Research done at The University of Texas at Austin could overcome the aforementioned difficulties. This novel technology provides a series of nano-composite alloy anodes in which an electrochemically active metal or alloy is dispersed in a ceramic matrix, which buffers the large volume changes occurring during cycling. The nano-composite anodes exhibit high capacity with good cyclability and rate capability.

Benefits/Advantages

  • High capacity
  • Better safety
  • Better tolerance to manganese poisoning

Features

  • Various range of capacities
  • Higher current density
  • Excellent capacity retention
  • Higher operation voltage

Market potential/applications

Anode material in sodium-ion batteries

Development Stage

Lab/bench prototype

IP Status