Structural engineering of porous N-doped carbon-coated Fe₃O₄ framework by controlling coordination for superior lithium-ion full-cell

The rational design of a proper electrode structure with high-performance and low cost still remains a significant challenge for developing advanced energy storage systems. Herein, we report a coordination-induced interlinked and porous N-doped carbon-coated Fe3O4 (Fe3O4@N-C) framework based on the Fe-based metal-organic fra-meworks (MOFs). The controlled coordination can not only provide the in-situ N-doping, but also generate the richer porous interlinked carbon framework, the superiority of the surface structure from the Fe3O4@N-C re-markably improves the transport performance of Li+ and electron. As a result, a specific capacity of 724 mAh g(-1) at 0.5 A g(-1) and a long-life stability for 300 cycles at 5 A g(-1) for half-cell can be obtained due to the more stable carbon framework. Importantly, the assembled full-cell also delivers a delightful performance with a specific capacity of 550 mAh g(-1) at 0.5 A g(-1) after 50 cycles. This controllably structural engineering by 2-methylimidazole assisted-coordination provides a simple approach to fabricate the high-performance nano-polyhedra towards the practical LIBs.