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Controlling Binder Adhesion to Impact Electrode Mesostructures and Transport
Ishan Srivastava1, Dan S Bolintineanu1, Jeremy B Lechman1
1Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.
ACS Applied Materials & Interfaces
|July 3, 2020
Summary
Controlling adhesion between active material and carbon binder domains in lithium-ion battery electrodes enhances performance. This mesostructural engineering strategy improves ionic and electronic conductivity for better batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Modeling
Background:
- Lithium-ion battery electrode performance is limited by complex multi-phase structures.
- Mesostructural engineering offers potential for enhancing electrochemical transport properties.
- Controlling interfacial interactions within electrodes is key to optimizing performance.
Purpose of the Study:
- To investigate the impact of active material (AM) and carbon binder domain (CBD) adhesion on lithium-ion battery electrode mesostructures.
- To explore a novel strategy for mesostructural engineering by tuning AM-CBD adhesion strength.
- To predict the effects of this strategy on key electrochemical transport properties.
Main Methods:
- Utilized high-fidelity, physics-based colloidal and granular dynamics simulations.
- Modeled the three-phase composition of battery electrodes (ion-conducting pores, AM, CBD).
- Analyzed the influence of varying AM-CBD adhesion strengths on electrode architecture.
Main Results:
- Demonstrated significant control over electrode mesostructures by manipulating AM-CBD adhesion.
- Predicted substantial improvements in ionic conductivity, electronic conductivity, and AM-electrolyte interface area.
- Showcased the potential for enhanced electrochemical performance through targeted mesostructural design.
Conclusions:
- Controlling AM-CBD adhesion is a viable strategy for engineering advanced lithium-ion battery electrode mesostructures.
- The proposed method offers a pathway to optimize critical electrochemical transport properties.
- This approach is experimentally feasible via surface functionalization and compatible with existing manufacturing processes.
