Session: DAC-11-01-Design of Engineering Materials and Structures

Paper Number: 89652

89652 - Design of Three-Dimensional Bi-Continuous Silicon Based Electrode Materials for High Energy Density Batteries 

Silicon-based anode is a promising candidate for the next generation high performance lithium-ion batteries (LIBs) with improved energy and power density. However, the practical application of Si anode is hindered by a major reliability issue that Si experiences significant volume change during its lithiation/de-lithiation cycles, leading to high stress, degradation, and pulverization of the anode. With the development of advanced electrode fabrication technologies, 3D structured Si anodes with delicately designed architectures have been investigated to alleviate this reliability challenge. This study focuses on five triply periodic minimal surface (TPMS) based 3D bi-continuous porous Si anodes, which consist of the nano structured metal scaffolds and conformally coated Si layers and explores their lithiation-induced stresses via numerical methods. The multi-physics based finite element (FE) models are firstly built to simulate the deformation and stress of Si anodes during lithiation processes. Afterwards, the Gaussian Processes (GP) based surrogate model is developed to assist the design optimization of the Si anodes within the design space. It is found that, the inverse FCC and diamond surface-based Si anodes show better performances with the lowest stress concentration. In addition, with the decrease of Si phase volume fraction and increase of scaffold fraction, the stresses can be further reduced.

Presenting Author: Zheng Liu University of Illinois at Urbana-Champaign

Presenting Author Biography: Mr. Zheng Liu is currently a PhD candidate in the Industrial and Enterprise Systems Engineering at University of Illinois at Urbana-Champaign.

Authors:

Zhuoyuan Zheng University of Illinois at Urbana-Champaign
Zheng Liu University of Illinois at Urbana-Champaign
Pingfeng Wang University of Illinois At Urbana-Champaign
Yumeng Li University of Illinois at Urbana-Champaign