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Esterification Modification for Interfacial Affinity Enhancement of Biogum Binders With Silicon/Carbon Anodes
Li Ma1, Tingting Su1, Qiushuai Xu1
1Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, Experimental Instrument Center, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, China.
Esterification modification of tara gum (TG) with propanoic acid (PPA) creates a novel TG-PPA binder. This binder enhances silicon/carbon anode performance by improving interfacial compatibility and stability for better lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Biogum binders effectively manage silicon anode expansion via hydrogen bonding.
- However, poor interfacial compatibility and adhesion limit biogum application in silicon/carbon (Si/C) anodes.
Purpose of the Study:
- To develop an esterification modification strategy for biogum binders.
- To enhance the interfacial affinity of biogum binders towards the carbon component in Si/C anodes.
Main Methods:
- Tara gum (TG) was modified with propanoic acid (PPA) via esterification under heating.
- The resulting TG-PPA binder was applied to Si/C anodes for lithium-ion battery testing.
Main Results:
- TG-PPA binder demonstrated improved dispersion and reduced internal stress in Si/C anodes.
- The binder formed a uniform coating, suppressed side reactions, and promoted a stable SEI layer.
- Si/C anodes with TG-PPA achieved 72% initial Coulomb efficiency and 550 mAh/g capacity after 100 cycles.
Conclusions:
- Esterification modification successfully addressed biogum limitations in Si/C anodes.
- The TG-PPA binder enables high-value utilization of renewable polymers for advanced battery binders.
