氮掺杂冰粉基碳包覆Fg3O4及其储锂性能研究.

The carbon coating strategy is an effective way to solve the pulverization problem caused by the volume expansion/shrinkage of transition metal oxide (TMO) materials for lithium-ion battery anodes during charge and discharge. Tn this paper, bio-based edible ice jelly powder was used as carbon source and ferric ammonium oxalate hydrogel was used as precursor, and nitrogen-doped ice jelly powder-based carb on-coated Fe3 ()i was prepared by one-step high-temperature pyrolysis. The morphology, structure and electrochemical properties of the samples were studied by XRD, SEM, TEM, XPS, TG A, Raman spectroscopy, ga Iva no static charge-discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that this method can quickly and massively prepare nitrogen-doped carbon-coated Fe$Oi porous composites (N-C@Fe3 O.-i), and excellent electrochemical performance can be obtained by adjusting the ratio of raw materials and heat treatment conditions. N-C@Fe3O.j-5 as a lithium ion battery anode material has good cycle stability (762.74 mAh/g specific capacity after 80 cycles at a current density of ().1 A/g) and high rate capability. Relevant mechanism studies have shown that the good rate performance of N-C@ Fes O.-i composites is mainly due to the contribution of pseudo capacitive capacity. The excellent electrochemical performance of the composite is attributed to the carbon coating that prevents nanoparticle agglomeration, improves electrical conductivity, and forms a stable solid electrolyte interface (SET) film. This work shows that ice jelly powder-based carb on-coated TMO is an effective way to improve the electrochemical lithium storage performance of TMO, which can be extended and improved the lithium storage performance of other lithium-ion battery oxide anodes. [ABSTRACT FROM AUTHOR]