3D porous hierarchical Li₂FeSiO₄/C for rechargeable lithium batteries

Abstract

Three-dimensional porous hierarchical Li2FeSiO4/C was fabricated using a facile hydrothermal reaction and served as an efficient cathode for rechargeable lithium batteries.

Evidence of Enhanced Ion Transport in Li‐Rich Silicate Intercalation Materials

“…Polyoxyanion‐type intercalation electrodes based on the orthosilicates, Li 2 MSiO 4 (where M = Mn 2+ , Fe 2+ , Co 2+ ), have been attracting significant attention . The major drawback of these materials is their poor rate performance, which is hindered by low lithium diffusion coefficients .…”

Six-armed twin crystals composed of lithium iron silicate nanoplates and their electrochemical properties

“…A hierarchical structure, such as that of hollow and shuttle-like Li 2 FeSiO 4 crystals, was obtained by hydrothermal and solvothermal methods. [38][39][40][41] Although the morphologies were supposed to be effective at reducing the distance of Li-ion diffusion, the superiority of hierarchical structures for electrochemical performance is still not fully understood.…”

Tuning anisotropic ion transport in mesocrystalline lithium orthosilicate nanostructures with preferentially exposed facets

“…For instance, the most studied orthosilicate material, Li 2 FeSiO 4 , has a poor Li ion diffusivity of~1 × 10 −14 cm 2 s −1 and an extremely low electronic conductivity of~6 × 10 −14 S cm −1 at 298 K, which are four orders of magnitude lower than the conductivity of its phosphate counterpart, LiFePO 4 (~10 -9 S cm −1 ) [12][13][14] . To address the kinetic issues, several efforts such as conductive coatings [15][16][17] , nanostructuring [18][19][20][21] , and heteroatom substitution [22][23][24][25][26] have been pursued to obtain high performance Li 2 FeSiO 4 -based cathodes. Among these strategies, nanoscale materials have been extensively studied because nanostructures generally offer a shorter diffusion length and more surface area for the insertion/ extraction process of charge carriers.…”