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Related Experiment Video

Updated: May 11, 2026

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

Published on: July 18, 2018

Research on high rate capabilities B-substituted LiFePO4.

Fu Wang¹, Yun Zhang, Chao Chen

¹College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China.

Journal of Nanoscience and Nanotechnology

|May 8, 2013

Summary

Boron substitution in lithium iron phosphate (LiFePO4) cathode materials enhances battery performance. Even small amounts improve rate capability, crucial for advanced lithium-ion batteries.

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Area of Science:

Materials Science
Electrochemistry
Inorganic Chemistry

Background:

Lithium iron phosphate (LiFePO4) is a leading cathode material for lithium-ion batteries.
Its rate capability is limited by the intrinsic structure of the tetrahedral phosphate unit.
Enhancing LiFePO4 performance is key for large-scale battery applications.

Purpose of the Study:

To investigate the effect of substituting phosphate (PO4)3- with borate (BO3)3- in LiFePO4.
To improve the rate performance of LiFePO4 cathode materials.
To synthesize and characterize LiFeB(x)P(1-x)O(4-delta) materials.

Main Methods:

Solid-state synthesis of LiFeB(x)P(1-x)O(4-delta) with varying boron content (x = 0, 3, 6, 9 mol%).
Characterization using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).
Electrochemical performance evaluation, including discharge capacity and capacity retention at different C-rates.

Main Results:

6 mol% boron substitution did not alter the crystal structure of LiFePO4.
Boron substitution significantly improved the rate performance of the cathode material.
The LiFeB0.06P0.94O(4-delta) sample showed high initial discharge capacity (145.62 mAh/g at 0.1 C) and good capacity retention (81% at 2 C, 76% at 5 C).

Conclusions:

Partial substitution of borate for phosphate in LiFePO4 is an effective strategy to enhance rate capability.
Optimal boron substitution levels (below 6 mol%) significantly boost the electrochemical performance of LiFePO4 cathodes.
This approach offers a promising route for developing high-performance lithium-ion batteries.