LTO anode material with attached nitrogen-doped graphene quantum dots, featuring excellent rate capability and no gas generation during long-term charge/discharge cycles

High-Rate LTO Anode Material with Suppressed Gas Generation via Nitrogen-Doped Graphene Quantum Dot Coating

This technology is a surface modification method that enhances conductivity and suppresses side reactions with the electrolyte by coating the surface of lithium titanium oxide (LTO) anode particles with 1–6 nm nitrogen-doped graphene quantum dots (N-GQDs).

Conventional LTO anode materials have limited high-rate charge/discharge performance due to low intrinsic electronic conductivity and lithium-ion diffusion coefficients. Furthermore, they suffer from swelling issues caused by gas generation resulting from electrolyte decomposition during charge, discharge, and storage.

This technology forms a 1–6 nm thick nitrogen-doped graphene quantum dot coating layer on LTO particles smaller than 1 μm. This structure prevents excessive SEI layer growth, improves the lithium-ion diffusion coefficient, and minimizes reductive decomposition of the electrolyte. It can be applied to ESS for power grid frequency regulation, hybrid buses, and fast-charging industrial batteries that require tens of thousands of cycles, thereby reducing the chronic swelling defects of LTO cells and increasing long-term operational reliability.

‍

‍

Key Features:

• Nitrogen-doped graphene quantum dot coating layer on lithium titanium oxide-based particles
• Coating layer structure where multiple nitrogen-doped graphene quantum dots are individually attached to lithium titanium oxide-based particles
• Nitrogen-doped graphene quantum dot coating layer composed of graphene quantum dots 1 nm to 6 nm in size, with a thickness of 1 nm to 6 nm
• Lithium titanium oxide-based particles containing Li4Ti5O12, Li1.33Ti1.67O4, or LiTi2O4, with a size of less than 1 μm

‍