Researchers from the Tokyo Institute of Technology and Okayama University have demonstrated a way to improve the performance of lithium-ion batteries by coating the LiCoO2 cathode in BaTiO3 nanodots. The research could lead to EV batteries that charge quicker and last longer.
The researchers fabricated three LiCoO2 cathodes: one bare, one coated with a planar layer of BaTiO3, and one coated with an array of BaTiO3 nanodots. In testing each, the researchers found that the nanodot-coated cathode performed much better than the other two in terms of stability and discharge capacity.
“Our results clearly demonstrate that decorating with BaTiO3 nanodots plays an important role in improving cyclability and reducing resistance,” said researcher Mitsuru Itoh.
The BaTiO3 nanodots concentrate electric current in a ring around them and create paths through which Li ions can pass, even at really high charge/discharge rates.
The researchers postulated that the nanodots create paths for lithium ions to traverse, even under high charge/discharge rates. The research is published in Nano Letters: Enhancement of Ultrahigh Rate Chargeability by Interfacial Nanodot BaTiO3 Treatment on LiCoO2 Cathode Thin Film Batteries.
Source: Tokyo Institute of Technology