Amorphous FePO₄/Carbon Nanotube Cathode Preparation via in Situ Nanoprecipitation and Coagulation in a Microreactor

Abstract

In this article, nanostructured amorphous FePO4 (a-FePO4)–carbon nanotube (CNT) composites, with high purity of FePO4 and a controllable FePO4/C ratio, were directly synthesized by a fast nanoprecipitation process in a microreactor, using Fe(NO3)3 and (NH4)3PO4 as precursors. Oxidized CNTs are well dispersed via strong electrostatic repulsion in a high pH solution system. Subsequently, a-FePO4 nanoparticles are adhered onto CNTs just following the fast nanoprecipitation process; then, the precipitated composites are compacted by ball-milling, forming a compact conductive network with well dispersed and highly loaded active materials. As cathode materials for lithium-ion batteries, the composites exhibit a capacity of 175.8 mAh g–1 at 0.1 C, close to the theoretical capacity (178 mAh g–1), and a good cycle performance with a reversible capacity of 137.0 mAh g–1 after 500 cycles at 5 C. Importantly, the enhanced micromixing enables fast nanoprecipitation in suspension and opens a shortcut for constructing nanostructured composites that have potential in functionalization and are easy to handle.

Novel Synthesis of 3D Mesoporous FePO4 from Electroflocculation of Iron Filings as a Precursor of High-Performance LiFePO4/C Cathode for Lithium-Ion Batteries

“…The total weight loss is found to be 22.5 and 21.59%, respectively, which remains essentially the same after 380 °C. The weight loss was due to the removal of crystal water from the precursors, indicating that both samples were dehydrated iron phosphate and the weight loss was consistent with the stoichiometric ratio of FePO 4 and H 2 O of 1:2, which is in accordance with the observation elsewhere. ,− This conclusion can be strengthened by the DSC curves of the samples. Two exothermic peaks imply that FP-I and FP-II lost two molecules of water at 182.2 and 141.9 °C, respectively.…”

Lactoferrin-Loaded PEG/PLA Block Copolymer Targeted With Anti-Transferrin Receptor Antibodies for Alzheimer Disease

“…The Lf-loaded polymer nanoparticles were prepared by the nanoprecipitation protocol. 39 - 42 Concisely, mPEG 5000 -PLA 16000 (50 mg) and the Lf (5 mg) were immersed into the DCM and added dropwise to the 20 mL of DD water with magnetic stirring, which obtained polymeric concentration of 1 mg/mL. After magnetic stirring for 1 hour, the residual organic solvent was removed using the rotary evaporation methods under low pressure.…”

Magnifying the GCD behaviour of FePO4 composite with low temperature plasma exposed Bamboo charcoal enforced in energy storage devices

“…FePO 4 has been reported as a potential cathode component for sodium storage due to its good redox reversibility and large theoretical capacity [9,10]. However, as a result of the Na + insertion/extraction operations, it exhibits a notable volumetric shift of over 22% and produces low electronic conductivity, which results in unpredictable cyclic performance and poor rate capacity [11,12]. Effective nano-architecture designs and carbon decorating are two viable solutions for resolving the aforementioned issues and thereby improving electrochemical characteristics [13][14][15][16].…”