Preparations of NiFe2O4 Yolk-Shell@C Nanospheres and Their Performances as Anode Materials for Lithium-Ion Batteries

Abstract

At present, lithium-ion batteries (LIBs) have received widespread attention as substantial energy storage devices; thus, their electrochemical performances must be continuously researched and improved. In this paper, we demonstrate a simple self-template solvothermal method combined with annealing for the synthesis of NiFe2O4 yolk-shell (NFO-YS) and NiFe2O4 solid (NFO-S) nanospheres by controlling the heating rate and coating them with a carbon layer on the surface via high-temperature carbonization of resorcinol and formaldehyde resin. Among them, NFO-YS@C has an obvious yolk-shell structure, with a core-shell spacing of about 60 nm, and the thicknesses of the NiFe2O4 shell and carbon shell are approximately 15 and 30 nm, respectively. The yolk-shell structure can alleviate volume changes and shorten the ion/electron diffusion path, while the carbon shell can improve conductivity. Therefore, NFO-YS@C nanospheres as the anode materials of LIBs show a high initial capacity of 1087.1 mA h g−1 at 100 mA g−1, and the capacity of NFO-YS@C nanospheres impressively remains at 1023.5 mA h g−1 after 200 cycles at 200 mA g−1. The electrochemical performance of NFO-YS@C is significantly beyond NFO-S@C, which proves that the carbon coating and yolk-shell structure have good stability and excellent electron transport ability.

Dealloyed Porous NiFe2O4/NiO with Dual-Network Structure as High-Performance Anodes for Lithium-Ion Batteries

“…Table 1 lists the Li storage properties of different NiFe 2 O 4 -based anode materials in LIBs [ 38 , 40 , 42 , 45 , 46 , 47 , 48 ]. It can be seen that the dual-network NiFe 2 O 4 /NiO composites present relatively good electrochemical performance in the listed studies.…”

Preparation of rambutan-like Co0.5Ni0.5Fe2O4 as anode for high–performance lithium–ion batteries

“…Up to now, many efforts have been conducted to solve this problem. One solution is to designing unique internal structures of NiFe 2 O 4 , such as hollow nanospheres ( Gao et al, 2017 ), yolk-shell structure ( Liu et al, 2020 ) nanofibers ( Luo et al, 2014 ) and so on. Another promising strategy is coupling with highly conductive materials, such as graphene ( Shen et al, 2021 ), carbon-based materials ( Mujahid et al, 2019 ) and so on.…”