Session: 

Paper Number: 160001

Silicon-Based Anode in All-Solid-State Batteries 

Nowadays, all-solid-state batteries (ASSBs) are very popular energy storage devices for many sectors, especially the electric vehicle (EV) field, owing to their extremely high energy density and super safe properties. However, there are many factors that hindering the wide commercial application of the ASSBs, such as the poor interfacial properties of the solid electrolyte (SE) and the electrode layers. Researchers have proposed many strategies to solve this issue, including the surface engineering, composite technique, etc. The composite technique is about manufacturing the anode/cathode layers using the SE powders and active particles, leading to a complete anode-SE-cathode layer, rather than stacking three layers together. This will eliminate the interface issue between electrode layer and SE layer, however, bring in new interfaces between electrode particles and SE particles. Especially when we consider Silicon (Si) as the anode active material, the huge volume change of Si will lead to the challenges of the interfacial stability between Si particle and SE. Although, this one-volume manufacturing strategy has been demonstrated beneficial for Si anode in ASSBs. So, this paper plans to study the electro-chemo-mechanical coupling behaviors of the Si anode within the ASSB systems. First, a finite element (FE) model considering the Si particle geometries inside of the anode layer will be established. The one cycle charge-discharge voltage profile will be used to validate the model by comparing the results with the testing data in the configuration of pressure-cell. Then, a full-cell model using the validated parameters and model settings will be conducted using Si as anode and NCM as cathode. Two major configurations of the anode layer will be compared first: one is the separate layer configuration where the anode layer and SE layer are fabricated separately, the other one is the one-volume configuration where the anode-SE-cathode are manufactured into one complete volume by mixing the active particles with the SE particles for both anode and cathode. Then, parametric studies will be performed to investigate the key factor effects, including the carbon coating properties, etc. Due to the high electrical conductivity, carbon materials are usually used as additive materials in the Si-based anode, we will use the validated model to study the effects of the carbon coating in terms of both mechanical constraint effect and electrochemical activity effects. Finally, the coupling effects will be analyzed and concluded as the design guidance. Both the model and fundamental knowledges will provide better understanding of the Multiphysics behaviors and the underlying governing mechanisms, as well as the powerful computation tools for next-generation ASSB design and application.

Presenting Author: Xiang Gao Shanghai Jiao Tong University

Presenting Author Biography: Dr. Xiang Gao now working as the associate professor at Shanghai Jiao Tong University. He has been studying the Si-based high-energy-density Lithium-ion batteries (LIBs) for many years. His research interests mainly focus on the Multiphysics behaviors of the Si-based anode from atomic scale to single cell level, considering the coupling effects from both electrochemical and mechanical fields. He has published 26 journal papers in top journals of the battery fields, such as Advanced Energy Materials, Carbon Energy, Small Science, etc., with the citation number of 1300 and H-index of 16. He has been working as the ASME technical committee members for 5 years and organized 4 sessions in the last 4 years. He also won the prize of 'Best Reviewer' for the conference journal JEECS for the year 2023.

Authors:

Xiang Gao Shanghai Jiao Tong University
Xi Zhang Shanghai Jiao Tong University