Spatially confined Ni3Se4/C architecture via continuous selenization: dual-role carbon matrix enables ultrahigh-rate lithium storage and reveals sodium-ion transport limitations
Year: 2025
Type: article
Abstract: Nickel selenides' structural diversity offers promising avenues for advanced battery anodes, yet their practical implementation faces persistent challenges of structural instability and sluggish kinetics. Addressing these limitations, we pioneer a spatially confined architecture through template-directed hydrothermal synthesis: ~48 nm Ni3Se4 nanoparticles uniformly encapsulated within conductive carbon nanoplates. Time-dependent XRD analysis confirms continuous selenization-driven phase evolution, while XPS/TGA verify the composite (30.6 wt% carbon) comprises Ni2+, Se22- and Se2- species. This dual-role design - where carbon simultaneously serves as electron highway and volume-change buffer - enables breakthrough lithium storage performance: 586.2 mAh g-1 after 100 cycles (0.2 A g-1) with exceptional 375.5 mAh g-1 retention at ultrahigh 5 A g-1. Electrochemical analysis demonstrates carbon spacers reduce charge-transfer resistance by >40% versus bare counterparts. The strategically engineered interface provides critical insights for stabilizing conversion-type anodes, though sodium storage remains challenging (167.9 mAh g-1 after 100 cycles), highlighting fundamental differences in ion storage mechanisms that guide future material design.
Source: Ionics
Institution: Longyan University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415328497