Related Experiment Video
Updated: Aug 2, 2026
Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
An environment-friendly crosslinked binder endowing LiFePO4 electrode with structural integrity and long cycle life
Lingzhu Zhao1, Zhipeng Sun1, Hongbing Zhang1
1State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, College of Materials Science and Engineering, Hainan University Renmin Road No. 58 Haikou 570228 PR China yuf@hainu.edu.cn ychen2002@163.com.
A new gelatin-based binder offers a stable and eco-friendly alternative to polyvinylidene fluoride (PVDF) for lithium iron phosphate (LiFePO4) batteries. This advanced binder enhances electrode performance and longevity in energy storage systems.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Lithium iron phosphate (LiFePO4) is a key cathode material for lithium-ion batteries.
- Polyvinylidene fluoride (PVDF) is the standard binder but has drawbacks like cost, environmental impact, and poor long-term stability due to weak adhesion.
- Weak interactions between PVDF and electrode materials lead to electrode structural degradation during cycling.
Purpose of the Study:
- To develop a novel, aqueous binder for LiFePO4 cathodes.
- To replace the conventional PVDF binder with a more sustainable and effective alternative.
- To improve the cycling stability and capacity retention of LiFePO4 batteries.
Main Methods:
- Methacrylate-modified gelatin was synthesized and crosslinked using UV photo-crosslinking to create an aqueous binder.
- The performance of LiFePO4 electrodes using the gelatin binder was evaluated and compared to those using PVDF.
- Electrode structural stability, capacity retention, and cycling performance were assessed over 300 cycles at 0.5C.
Main Results:
- The gelatin binder effectively stabilized the LiFePO4 electrode structure, preventing crack formation and material detachment.
- LiFePO4 electrodes with the gelatin binder achieved a high capacity of 140.3 mA h g⁻¹ with 90.1% retention after 300 cycles.
- These results significantly outperformed the PVDF binder, which yielded only 114.4 mA h g⁻¹ capacity and 74.8% retention.
Conclusions:
- Methacrylate-modified gelatin serves as a superior binder for LiFePO4 cathodes compared to PVDF.
- The developed aqueous binder enhances electrode stability and electrochemical performance in lithium-ion batteries.
- This gelatin-based binder presents a promising, environmentally friendly alternative for practical energy storage applications.
