Designing Structural Batteries with High Energy Density and Enhanced Safety
Abstract
In this project, we mainly focused on tasks 1 and 3. For task 1, we developed a scalable tree-root-like lamination at the electrode/separator interface with porous fluoropolymers, which enhances load transfer from one component to another. Such interfacial adhesion dramatically enhances the flexural modulus of pouch cells by 10 times, from 0.28 GPa to 3.1 GPa. On the other side, such modification does not compromise the electrochemical performance of corresponding cells. AnNMC/graphite full cell with such interfacial lamination delivers a steady discharge capacity of 151.4 mAh g-1 at C/2 and 141.9 mAh g-1 after 500 cycles. Moreover, the specific energy only decreases by 3-4%, which is the smallest reduction reported so far in structural batteries. A prototype of "electric wings" was also demonstrated, which allows an aircraft model to fly steadily. Besides such interfacial adhesion, we also explored multiple polymer electrolytes for enhancing load transfer when electrolyte presented, including epoxy, poly(vinyl carbonate) and polyacrylate. 10-20 X enhancement of mechanical properties are observed while electrochemical cells can be cycled. After evaluation, we decide to focus on the polyacrylate electrolyte, which will be carried in the next round of this project (2022-2024), The results are described in section 4 in the progress details.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 2022
- Accession Number
- AD1190045
Entities
People
- Yang Yuan
Organizations
- Columbia University