Surface structure decoration of high capacity Li1.2Mn0.54Ni0.13Co0.13O2 cathode by mixed conductive coating of Li1.4Al0.4Ti1.6(PO4)3 and polyaniline for lithium-ion batteries

Abstract The lithium-rich manganese cathode material Li 2 MnO 3 ·LiMO 2 (M = Mn, Co, Ni, Fe, etc.) has been received extensive attention for Li-ion batteries owing to its ultra-high specific capacity (>250 mAh g −1 ) and lower cost. Nevertheless, it is still strictly challengeable to achieve encouraging Li-storage behaviors due to its poor cyclability, rate performance, and voltage decay. Li-rich manganese cathode material Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LRNCM) modified by a novel hybrid conductive layer constructed with Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) and polyaniline (PANI) is prepared. The hybrid modification layer (LATP&PANI) not only serves as a physical barrier to protect the active material from the electrolyte, but also combines the high ionic conductivity of Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 with the excellent electronic conductivity of polyaniline, helping for facilitating the transfer of electrons and lithium ions. The hybrid modification cathode material (LRNCM@3 wt%LATP@1 wt%PANI) displays favorable rate capability and cycle performance, whose capacity retention (2.0–4.8 V at 0.2 C, 25 °C) deliveries 79% after 200 cycles. The hybrid modification is a promising route for remarkable enhancement in performance of the lithium-rich manganese-based cathode materials.