Generalized synthesis of NaCrO₂ particles for high-rate sodium ion batteries prepared by microfluidic synthesis in segmented flow

Abstract

NaCrO2 particles for high-rate sodium ion batteries were prepared on a multigram scale in segmented flow from chromium nitrate and sodium nitrate using a segregated flow water-in-oil emulsion drying process....

Microfluidic Synthesis of Multifunctional Micro-/Nanomaterials from Process Intensification: Structural Engineering to High Electrochemical Energy Storage

“…Recently, the microfluidic technology has become a promising platform to efficiently synthesize and regulate metallic oxides and polyanionic compounds, such as NCM nanoparticles, Na 3 V 2 O 2 (PO 4 ) 2 F nanoparticles and NaCrO 2 nanoparticles. For example, Zhou et al established the liquid−liquid microextraction method to 41 The reaction efficiency of the droplet microreactor was about several orders of magnitude higher than those of traditional flask reaction and solid-state reactions, due to negligible diffusion limits and the rapid mass/heat transfer rate (Figure 4d). 2D Materials.…”

“…For example, Do-Hyun Quak et al achieved large-scale production of NaCrO 2 nanoparticles via a segregated flow microreactor. 41 Benefiting from confined microreactor units of water-in-oil emulsions with low diffusion limit, the reaction and drying processes were greatly decreased within several minutes because of the rapid mass/heat transfer rate and intermixing efficiency. More notably, this segregated flow microreactor showed high universality for synthesis of other type layered transition-metal oxides, such as NaFeO 2 nanoparticles, NaCoO 2 nanoparticles and NaAlO 2 nanoparticles, which might present high sodium storage capacity and energy density in sodium-ion batteries.…”

“…Copyright 2021, Elsevier. (d) Continuous-flow synthesis of NaCrO 2 nanoparticles . Reprinted with permission from ref .…”

“…(d) Continuous-flow synthesis of NaCrO 2 nanoparticles . Reprinted with permission from ref . Copyright 2022, Royal Society of Chemistry.…”

“…Compared with polyanion-based compounds, the layered oxides with high energy density and specific capacities have been developed as cathode materials of the sodium-ion battery. For example, Do-Hyun Quak et al reported multigram scale preparation of layered NaCrO 2 particles from a Cr(NO 3 ) 3 and NaNO 3 mixed droplets microreactor via microfluidic segregated flow . The reaction efficiency of the droplet microreactor was about several orders of magnitude higher than those of traditional flask reaction and solid-state reactions, due to negligible diffusion limits and the rapid mass/heat transfer rate (Figure d).…”