Mechanical and electrical changes in electrochemically active polyimide binders for Li-ion batteries
- National Renewable Energy Laboratory (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Colorado School of Mines, Golden, CO (United States)
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Polyimide binders are often used in electrodes made with silicon for lithium-ion batteries for their mechanical strength and adhesion, which help mitigate mechanical issues associated with large volumetric expansion. These binders can be electrochemically active, but it is difficult to characterize what physical and chemical changes occur due to a composite electrode with multiple components and processes at play. Here, in this work, we study electrodes consisting only of polyimide binder and conductive carbon, using scanning probe-based techniques—contact resonance, force volume, and scanning spreading resistance microscopy—along with cryo-scanning transmission electron microscopy, electron energy loss spectroscopy, and energy dispersive X-ray spectroscopy. We show that lithium becomes trapped in the binder during cycling and results in large initial capacity losses, the formation of dendrite-like features, column-like domains of significantly increased mechanical modulus, and a slight increase in electronic resistivity.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 2500793
- Report Number(s):
- NREL/JA-5K00-89008; MainId:89787; UUID:6ad7d750-874c-44ec-b730-e22b83c5d1e5; MainAdminId:75606
- Journal Information:
- Journal of Materials Chemistry. A, Vol. 13, Issue 3; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries
Understanding Interfacial Electrochemical Reactions through in situ ec-STEM and IL-Cryo-STEM