Synthesis of Carbon-Coated LiFePO₄Cathode Material by One-Step Microwave-Assisted Pyrolysis of Ionic Liquid Process

Abstract

A one-step microwave-assisted pyrolysis of ionic liquid process is developed to synthesize carboncoated LiFePO 4 by using the ionic liquid [BMIm]N(CN) 2 as a carbon source. A thin layer of uniform and nanoscaled carbon¯lm is formed on the LiFePO 4 particles surface with a strong interface. The electrochemical properties of LiFePO 4 are improved due to the carbon coating which increases the electronic conductivity of LiFePO 4 . The results indicate that the microwaveassisted pyrolysis of ionic liquid process is a rapid and e±cient method to prepare carbon-coated LiFePO 4 material and other carbon-coated electrode materials.

Preparation and Electrochemical Properties of Carbon-Coated LiMn0.6Fe0.4PO4 Cathode Material for Lithium-Ion Batteries

“…[15][16][17] To solve the above problems, some modification methods have been carried out, including reducing the particle size to the nanoscale, surface conductive carbon coating, and metal ion doping (Mg, Ni, Ce, etc.). [18][19][20][21] Among these methods, carbon coating is extensively used to enhance the electrochemical properties of the LiMn x Fe 1−x PO 4 cathode materials. 22,23 The LiMn 0.5 Fe 0.5 PO 4 /C composite was prepared by Li et al 24 using sucrose as a carbon source, which delivered the discharge capacity of 165, 132, and 92 mAh g −1 at 0.1 C, 1 C, and 10 C rate, respectively.…”