Abstracts Book - IMRC 2018

• SD1-O009
SPATIALLY RESOLVED MULTIPHYSICAL MODELING AND
SIMULATION OF LITHIUM DENDRITE GROWTH
Aniruddha Jana 1 , Edwin Garcia 1
1 Purdue University, Materials Engineering, United States.
It is well documented in the scientific literature that lithium electrodeposits grow
into elongated dendritic structures the top (tip-controlled) at high current
densities and into mossy structures the base (base-controlled) under low
current densities. In order to physically understand base-controlled growth, first
an analytical model has been developed to incorporate the thermodynamic and
kinetic driving forces of lithium to describe the multiphysical electrodeposition
kinetics of lithium. Given the charging current density, the following regimes of
lithium growth behavior are readily predicted the analytical framework: (i)
thermodynamic suppression regime, (ii) incubation regime, (iii) tip-controlled
regime, (iv) base-controlled regime, and (v) mixed growth regime. These regimes
explain the experimental observations and provide the kinetic boundaries
between tip- and base-controlled growth. Further, numerical calculations
demonstrate that high von Mises stresses in localized regions of the lithium
whisker extrude lithium and lead to base-controlled growth. In addition, the
complex multiphysical dendrite-dendrite electro-chemo-mechanical
interactions to rationalize local electric fields, electrodeposition rates,
mechanical stresses, and plastic velocities that are otherwise difficult to visualize
in-situ in experiments. Overall, the combined analytical and the numerical
frameworks provide multiphysical insight and serve as a design guideline for
dendrite-free rechargeable batteries.
Keywords: lithium dendrites, battery modeling, lithium electrodeposition
Presenting authors email: redwing@purdue.edu