LiEuTiO4 as a promising anode material for a safe 4 V lithium-ion battery

Attributed to its medium operating potential of 0.8 V, the layered perovskite LiEuTiO4 (LETO or L100) has been deemed as an appealing anode candidate for lithium-ion battery (LIB), circumventing the risk of lithium plating at a low potential of approximately 0 V while preserving the battery voltage. However, its inherent low conductivity and sluggish kinetics stagnate its practical use, and its compatibility with high-voltage cathode is still neglected. Therefore, we fabricate [email protected] (LC) composite using carbon nanofiber webs (CNFWs) as surface-modifier and scaffold. To fabricate this composite, firstly LETO and CNFWs compound was ball-milled according to different weight ratios. The balled-milled L100, LC20, LC5, and LC2 exhibit excellent electrochemical behaviors, nearly 133.6, 151.0, 181.0, and 200.0 mAh g−1 of specific charge capacities after 1000th cycles are acquired at 1 A g−1, which are about one and half times higher than that of untreated LETO compared to LC2, and more stable cyclability stems from the enhanced conductivity and Li+ transportation. Moreover, the full cell based on calcined LiNi0.5Mn1.5O4 (LNMO-700 °C) and LC2, demonstrates considerable capacity with a high voltage plateau of about 4 V. As well, LC2||LNMO-700 °C full-cell exhibits 114.3 mAh g−1 superior specific charge capacity after 100 cycles at 0.1 A g−1 compared to L100|| LNMO-700 °C, LC20||LNMO-700 °C, LC5|| LNMO-700 °C. This surface-modify strategy here is instrumental to the realistic employment of LETO as a promising anode for a safe 4 V LIB with high capacity.