Tannic Acid-Derived Carbon Coating on LiFePO 4 Nanocrystals Enables High-Rate Cathode Materials for Lithium-Ion Batteries

作者：Yanzhuang Wang, Cong Cui, Renfei Cheng, Junchao Wang, Xiaohui Wang · 发表于：ACS Applied Nano Materials · 年份：2023 · DOI：10.1021/acsanm.3c01372 · 被引用次数：13 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

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.