Convection-inducing electrolyte for secondary batteries and secondary battery comprising the same

Dendrite-suppressing electrolyte that induces micro-convection using anisotropic magnetic particles driven by a rotating magnetic field

This technology disperses anisotropic magnetic particles with an insulating coating layer into a liquid electrolyte and applies an external rotating magnetic field to rotate the particles, thereby inducing micro-convection within the electrolyte.

Secondary batteries, including medium-to-large scale batteries, have historically faced issues with non-uniform ion distribution within the electrolyte during high-speed charging and discharging. This concentration gradient leads to the formation of metal dendrites, which limits battery lifespan and stability.

This technology involves adding anisotropic magnetic particles—consisting of a magnetic core with an aspect ratio of 2–50 and a minor axis length of 20–300 nm, covered by an insulating coating—into the electrolyte at a concentration of 0.01–1.0 mg/mL. By using an external rotating magnetic field to create active micro-flow within the electrolyte, it ensures uniform ion distribution and promotes dense metal electrodeposition. Applicable to electric vehicle batteries linked to fast-charging stations, large-scale ESS modules, and zinc or lithium metal anode batteries, this solution mitigates concentration polarization during high-rate charging simply by applying a magnetic field, without requiring changes to the battery structure.

‍

‍

Key Features:

• Liquid electrolyte for secondary batteries comprising a solvent, an electrolyte salt, and anisotropic magnetic particles
• Anisotropic magnetic particles with an aspect ratio (major axis length divided by minor axis length) of 2 to 50 and an average minor axis length of 20 to 300 nm
• Anisotropic magnetic particles that induce convection in the electrolyte by rotating around an axis perpendicular to the major axis under an external magnetic field
• Magnetic field application unit that drives magnetic particles within the electrolyte by applying a rotating magnetic field to the secondary battery

‍