As typical conversion reaction-type anode materials for sodium-ion batteries (SIBs), iron-base sulfides possess high theoretical capacity, nontoxicity, and nature abundance, making them one of the potential anode materials that can be used in SIBs. However, iron-base sulfides with poor electron/ionic conductivity present a sluggish sodium storage kinetics, which restricts their practical applications. This study utilized iron disulfide (FeS2) as an example and applies the ion doping strategy to modify the crystal structure and investigate the sample's sodium storage performance. Co2+-doped FeS2 is specifically prepared through a feasible and controllable hydrothermal method. The characterization results reveal that the Co2+ amount in the precursor solution plays a key role in regulating the sample's microstructure. Moreover, an enlarged interplanar spacing of (200) is observed in FeS2. The electrochemical test reveals that the doped materials obtain enhanced rate capabilities and cyclic stability. The optimized sample has revisable specific capacities of 264.3, 224.9, and 193.4 mAh/g at current densities of 1, 2, and 4 A/g, respectively. A 229.8 mAh/g reversible discharge capacity is maintained at 1 A/g current density after 400 cycles, corresponding to 74.6% capacity retention. The kinetics analysis illustrates that the doped FeS2 presents an improved Na+ diffusion coefficient and a capacitive dominated sodium storage mechanism. This study provides theoretical reference for the fabrication of high-performance anode materials for SIBs.
CHEN Kejun. Controllable synthesis of Co2+-doped FeS2 and their sodium storage performances[J]. Energy Storage Science and Technology, 2023, 12(10): 3056-3063
Fig. 3
(a) SEM image of sample FC0; (b) TEM image of sample FC0 and (c) HRTEM image of sample FC0, (d) SEM image of sample FC2, (e) TEM image of sample FC2 and (f) HRTEM image of sample FC2, (g)—(j) EDS mapping images of sample FC2
Fig. 4
(a) High-resolution XPS spectra of Fe 2p in sample FC2, (b) High-resolution XPS spectra of Co 2p in sample FC2, (c) High-resolution XPS spectra of S 2p in sample FC2
Fig. 5
(a) CV curves of sample FC2, (b) Discharge/charge profiles of sample FC2, (c) Rate capabilities of samples FC0 and FC2, (d) Electrochemical impedance spectroscopy of sample FC0 and FC2, (e) Long-term cycling performances of sample FC0 and FC2
Fig. 7
(a) Electrochemical impedance spectroscopy of sample FC0 and FC2; (b) CV curves of sample FC2 at different scan rates, (c) capacitive contribution ratio of sample FC2 at scan rate of 0.3 mV/s, (d) capacitive contributions of sample FC2 at different scan rates
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