Developing a model for the impact of non-conformal lithium contact on electro-chemo-mechanics and dendrite growth

被引:4
|
作者
Meyer, Julia M. [1 ,2 ]
Harrison, Katharine L. [3 ]
Mukherjee, Partha P. [1 ]
Roberts, Scott A. [2 ]
机构
[1] Purdue Univ, Sch Mech Engn, W Lafayette, IN USA
[2] Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87123 USA
[3] Sandia Natl Labs, Mat Phys & Chem Sci, Phys, Chem Sci, Albuquerque, NM USA
来源
CELL REPORTS PHYSICAL SCIENCE | 2023年 / 4卷 / 04期
关键词
FINITE-ELEMENT-METHOD; ION BATTERIES; DEFORMATION; SEPARATORS; INTERFACES; TRANSPORT; CHEMISTRY; LIFSI;
D O I
10.1016/j.xcrp.2023.101364
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Lithium dendrite growth hinders the use of lithium metal anodes in commercial batteries. We present a 3D model to study the mechan-ical and electrochemical mechanisms that drive microscale plating. With this model, we investigate electrochemical response across a lithium protrusion characteristic of rough anode surfaces, represent-ing the separator as a porous polymer in non-conformal contact with a lithium anode. The impact of pressure on separator morphology and electrochemical response is of particular interest, as external pressure can improve cell performance. We explore the relationships between plating propensity, stack pressure, and material properties. External pressure suppresses lithium plating due to interfacial stress and separator pore closure, leading to inhomogeneous plating rates. For moderate pressures, dendrite growth is completely suppressed, as plating will occur in the electrolyte-filled gaps between anode and separator. In fast-charging conditions and systems with low electro-lyte diffusivities, the benefits of pressure are overridden by ion trans-port limitations.
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页数:20
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