Surface Modification on TiNb2O7 Anode Via Atmospheric Pressure Plasma Jet for High-Rate Lithium-Ion Battery

Abstract

Lithium-ion battery is one of the most vital energy storage devices due to high energy density property. In anode, TiNb2O7 (TNO) demonstrates high capacity as compared to Li4Ti5O12 materials. It is attractive for its high safety because of adequate Fermi level, implying that the solid electrolyte interface would not form during the charging and discharging process. This work provides a promising method of modifying the electrode, which includes PVdF, conductive carbon, and TNO, using the technology of atmospheric pressure plasma jet (APPj) treatment. This method is potential to accomplish roll-to-roll modification in the industry without any complex synthesis processes. In addition, APPj method is a time-effective process to treat the electrode. It has found that the treatment via APPj enhances the electrochemical performance by N-doped decoration on conductive carbon, as well as defects manufacturing of the TNO anode materials, and electrolyte wettability improvement on binder. The surface free energy of the APP-20 sample increases, improving the wettability of the electrolyte and contributing to an enhanced electrochemical performance. The C-rate performance of APP-20 improves significantly at 10C as compared to the sample without treatment. Also, the cycle test of APP-10 provides high retention after 300 cycles at 1C. In summary, this work promotes a feasible and facile treatment for roll-to-roll processing, and the mechanism could be established. APPj In short, the modification technique of APPj is an affordable method to apply in the lithium-ion battery of the industry manufacturing.