Boosting electrochemical performance of Ni-rich layered cathode via Li2SnO3 surface coating and Sn4+ gradient doping based dual modification for lithium-ion batteries

다국어 초록 (Multilingual Abstract)

Ni-rich ternary oxide cathode (LiNi0.8Co0.1Mn0.1O2, NCM) is highly promising candidate for lithium-ion batteries (LIBs)due to its relatively large specific capacity and high energy density. Nevertheless, intrinsic structural/chemical instability andunwanted side reactions on the surface during charge/discharge, leading to rapid capacity fading and inferior cycle performance,severely impeded its commercialization. Herein, we demonstrated an interfacial/surface dual modification strategy,one of the most important techniques for fabricating LiNi0.8Co0.1Mn0.1O2,NCM cathode materials via Li2SnO3surfacecoating and Sn4+gradient doping. The electrochemical results deliver that the Sn dual-modified NCM exhibits the highestdischarge capacity of 86.5% at 6.0 C and superior initial discharge capacity of 177.8 mAh g−1. In addition, Sn-modifiedNCM811 cathode shows an improved reversible capacity of 144.9 mAh g−1 and excellent electrode kinetics after 200 cycles.
The dual modification strategy proposes a novel approach that can accelerate commercialization by simultaneously alleviatingthe surface instability and bulk structural degradation of Ni-rich cathode materials for state-of-the-art LIBs.