Tannic Acid-Derived Carbon Coating on LiFePO₄ Nanocrystals Enables High-Rate Cathode Materials for Lithium-Ion Batteries

Abstract

Tannic acid (TA) is a plant polyphenol capable of coating hydrothermally grown LiFePO 4 nanocrystals by simple wet impregnation and drying. Mild pyrolysis in an inert atmosphere transforms the TA coating on LiFePO 4 nanocrystals into homogeneous and compact carbon films. Introducing conductive carbon films on LiFePO 4 nanocrystals increases the electrical conductivity of the LiFePO 4 /C composite. However, reaction kinetics revealed that excessively thick carbon films limit the Li + diffusivity of the LiFePO 4 /C composite during delithiation/lithiation. Therefore, the electrical conductivity and Li + diffusivity must be balanced to achieve the required electrochemical properties.

LFP-based binder-free electrodes produced via fused filament fabrication

“…129 and 168 mAh•g −1 respectively, and efficiencies of ≈95%, which is fairly close to the state-of-the-art electrodes obtained by conventional uniaxially pressing [54]. As LFP has been considered as a strong candidate in the development of batteries for applications such as electric vehicles due to their stability during lithiation/delithiation, low cost and safety [55][56][57], in the present work we report the fabrication of novel binder free LFP/C cathodes via FFF 3D printing, including studies of the phase stability and characterisation of the micro-and macrostructure, electrical conductivity and electrochemical performance tests of the optimised electrodes.…”

Beyond conventional batteries: a review on semi-solid and redox targeting flow batteries-LiFePO4 as a case study

“…32–34 However, the sluggish diffusion kinetics of lithium ions and the poor electronic conductivity, resulting in a significant capacity loss at high C-rate, are the main obstacles that limit the performances of this material. Several strategies have been developed to overcome the aforementioned issues such as particle size reduction, 35–37 surface coating, 38–41 preparation of composite electrodes, 42–44 addition of conductive binders, 45–47 and doping. 48–51 All these strategies have shown encouraging results in lithium-ion batteries, but less attention has been given to the application of these advanced LFP based materials for redox flow batteries.…”

A Robust and Scalable N-Doped Carbon Coating Strategy for the High-Performance LiFePO4 Cathode

“…Coating LFP particles with conductive carbon not only enhances their electrical conductivity and enables high-rate discharge capabilities but also minimizes direct contact with the electrolyte. This reduction in contact helps prevent side reactions, mitigate polarization phenomena, and extend cycle life. − One particularly promising technique involves utilizing C/N doped coatings on the surface of LFP. Such coatings enhance the cyclic stability of LFP by improving the electron conductivity and reducing side reactions during charge and discharge.…”