The promising LiNi 0.92 Co 0.05 Al 0.03 O 2 (NCA) cathode materials have become attractive recently for high-energy-density lithium-ion batteries (LIBs), but they suffer from severe capacity fade due to structure degradation and interface instability. Herein, a dual-modification strategy of Nb doping and Li 4 SiO 4 coating is employed to consolidate the surface and crystal stability of NCA. The Nb doping could suppress the anisotropic volume change and alleviate the generation of microcracks. Also, the Li 4 SiO 4 coating layer effectively accelerates the Li-ion transfer and protects the NCA surface from electrolyte attack. These advantages make the dual-modified NCA exhibit a high specific capacity of 199.2 mA h g −1 at 1 C with a capacity retention of 93.3% after 100 cycles. It delivers a high capacity of 160.0 mA h g −1 at 10 C, much higher than the pristine NCA (138.2 mA h g −1 ). The structure−performance relationship has been discussed. This work may provide guidance to modify Ni-high cathode materials for enhancing the high-energy and cyclic performance of LIBs.
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