Abstract
Nitrogen-doped carbon has been proved to be able to improve the cathode performance of lithium ion batteries (LIBs). As a cathode material, LiFePO4 (LFP) has been widely used for LIBs. However, it needs higher quantity of conductive carbons to enhance its electrochemical performances due to the low ion diffusion coefficient and poor electronic conductivity. Herein, we demonstrate a one-step and facile synthetic route of nitrogen-doped graphite carbon (NGC) for coating the LFP particles. It derives from the chitosan precursor by freeze drying technology and annealing at 600–800 °C. Raman spectroscopy and high-resolution transmission electron microscopy indicate the coating layer is the graphite carbon with a single layer nature. X-ray photoelectron spectroscopy test proves the existence of C–N or C=N (285.2 eV) bonding in the graphite carbon. After coating, the LFP@NGC cathode achieves a specific capacity of ∼ 155.5 mAh g−1 with Coulombic efficiency ∼ 97% at 0.1 C. The cell has a capacity of 63.2 mAh g−1 at 5 C after 100 cycles with Coulombic efficiency and capacity retention ratio of ∼ 100%. This work offers a new and facile route to fabricate NGC for the energy storage.
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