Solid Phase Fusion: A Simple and Eco-Friendly Modification Strategy for Li_1.2Ni_0.2Mn_0.6O₂ Li-Rich Cathode Materials

Li-rich cathode materials, with promising specific capacity, have attracted continued research attention. However, when charged to a high voltage, the materials experience rapid capacity decline and transition metal ion dissolution over the long cycle of the battery. In this work, fast ion conductor modified Li[Li0.2Ni0.2Mn0.6]O2 (LLNM), as a Li-rich cathode material, has been effectively synthesized by the solid phase fusion technology (SFT). Typically, the structural transformation, metal ion dissolution and interface side reactions with the electrolyte are efficiently suppressed by the NaNbO3 modified layer. The modified cathode materials exhibit optimal cycling stability with an initial discharge capacity of 186.8 mA h g−1 and merely 0.22 V voltage fading after 200 cycles at 1 C. And this material shows better high and low temperature electrochemical performances. Moreover, SFT is an eco-friendly method, which is suitable for large scale synthesis, and shows good commercial perspective.