LiVP2O7/C: A New Insertion Anode Material for High-Rate Lithium-Ion Battery Applications.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium Vanadium Pyrophosphate (LiVP2O7/C) is recognized for its environmental compatibility and economic viability as a cathode material.
• The development of advanced anode materials is crucial for enhancing the performance of rechargeable lithium batteries.

Purpose of the Study:

• To investigate the potential of LiVP2O7/C as an anode material in rechargeable lithium batteries.
• To evaluate the electrochemical performance of LiVP2O7/C when used as an anode.

Main Methods:

• Synthesis of LiVP2O7/C using an oxalyl dihydrazide assisted solution combustion method.
• Assembly of rechargeable lithium cells with LiVP2O7/C as the anode material.
• Electrochemical testing to determine capacity, Coulombic efficiency, and rate performance.

Main Results:

• The LiVP2O7/C anode delivered an initial capacity of 600 mAh g(-1) at 0.5 C with 99% Coulombic efficiency for 150 cycles.
• High rate capabilities were observed, with capacities of 200, 150, 120, and 110 mAh g(-1) at 2, 4, 6, and 8 C rates, respectively.
• Stable performance was achieved at a 10 C rate, with a capacity of 107 mAh g(-1) over 500 cycles, close to the theoretical value of 117 mAh g(-1).

Conclusions:

• LiVP2O7/C demonstrates significant potential as a high-capacity and high-rate anode material for rechargeable lithium batteries.
• This finding opens new avenues for exploring various LiMP2O7/C composites for their anode applications.
• The study expands the application scope of LiVP2O7/C beyond its traditional role as a cathode material.