A Li3PO4 coating strategy to enhance the Li-ion transport properties of Li2ZnTi3O8 anode material for Lithium-ion Battery

Li 2 ZnTi 3 O 8 (LZTO) has been highlighted as a promising active anode material for rechargeable lithium-ion batteries, but it suffers from a low high-rate capacity due to the sluggish Li-ion diffusion kinetics and inevitable consumption of Li + due to side reactions at the electrode/electrolyte interface. In this study, using Li 3 PO 4 as a lithium ion conductor and interface modifier, the crystal structure and electrochemical properties of LZTO are systematically studied and confirm that it is a faster lithium ion conductivity. Li 3 PO 4 not only accelerates Li-ion transport and increases diffusion paths, but also exhibits interfacial stability at high temperatures. Due to these advantages, the LZTO electrode containing the Li 3 PO 4 coating layer exhibits significantly improved electrochemical performance. The new Li 3 PO 4 coated LZTO electrode shows a large discharge specific capacity of 158.9 mAh g   −   1 and a high capacity retention of 99% is obtained after 200 cycles at a rate of 5.0 A g   −   1 and combined with cycle stability. Furthermore, the Li 3 PO 4 coated LZTO electrode also exhibits excellent low electrode polarization and high temperature long cycling performance for 500 cycles at temperatures up to 70 °C.