LiNi0.9Co0.05Mn0.05O2 cathode coated with carbon nitride for high-energy-density and long-life lithium batteries
High-capacity nickel-rich layered oxides are promising cathode materials for secondary lithium-based battery systems.However,its poor conductivity and side reactions at the electrode/electrolyte interface lead to unsatisfactory rate and cycle performance.Herein,the two-dimensional material g-C3N4 with excellent conductivity is used to uniformly coat the nickel-rich material LiNi0.9Co0.05Mn0.05O2.The coating g-C3N4 can effectively inhibit the structural degradation and intergranular cracks during the life of nickel-rich materials,and physically prevent the direct contact between the active material and the electrolyte,thereby stabilizing the electrode/electrolyte interface and preventing the occurrence of harmful side reactions.In addition,the coating of g-C3N4 enhances the lithium deintercalation/intercalation kinetics in terms of apparent lithium ion diffusion coefficient.The synthesized coated material has a capacity of up to 175.2 mAh/g after 200 cycles at 1 C in the voltage range of 3～4.5 V,and can still obtain a reversible capacity of 154.3 mAh/g at 5 C,which is much better than the performance of the uncoated material.This work sparks new ideas on constructing ultra-thin interface layers with excellent comprehensive performance for high-nickel ternary-metal oxide cathodes.
lithium ion batteryhigh nickel ternary cathodetwo-dimensional material g-C3N4coating
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