Strain and Conductivity in Lithium Ion Battery Binders

Technical Report · Mon Sep 16 00:00:00 EDT 2019

DOI:https://doi.org/10.2172/1561807· OSTI ID:1561807

Janvrin, Madison R. ^[1]; Grillet, Anne M. ^[1]

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1. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Lithium batteries provide high energy density storage with applications ranging from consumer electronics to electric vehicles. However, they have a limited lifespan and experience capacity loss with aging. Multiple mechanisms contribute to battery aging. The battery binder plays two important roles in the electrodes, and the damage it sustains during cycling may play a role in the degradation of the overall battery performance. Mechanical stress during battery operations occurs as a result of the swelling and shrinking of the electrodes because of the movement of lithium with cycling. The yield stress of the swollen polyvinylidene fluoride carbon black (PVDFCB) binder was measured at approximately 4MPa for PVDF with carbon black CB weight fractions between 10-30% swollen in propylene carbonate. This is far less stress than is typically experienced in an electrode during cycling. The effects of this permanent damage to the binder were explored by measuring the conductivity loss with strains in excess of the binder yield.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1561807
• Report Number(s): SAND-2016-7341R; 646248
• Country of Publication: United States
• Language: English