Open‐Source CFD Elucidating Mechanism of 3D Pillar Electrode in Improving All‐Solid‐State Battery Performance

Abstract

All‐solid‐state batteries (ASSBs) have become an important technology because of their high performance and low‐risk operation. However, the high interface resistance and low ionic conductivity of ASSBs hinder their application. In this study, a self‐developed electrochemical model based on an open‐source computational fluid dynamics platform is presented. The effect of contact area reduction at the electrode/solid‐state electrolyte interface is investigated. Then, a new conceptual 3D structure is introduced to circumvent the existing barriers. The results demonstrate that the discharge time is shortened by over 20% when the area contact ratio reduces from 1.0 to 0.8 at 1 C‐rate, owing to the increased overpotential. By adopting the new 3D pillar design, the energy density of ASSBs can be improved. However, it is only when a 3D current collector is contained in the cathode that the battery energy/power density, capacity, and material utilization can be greatly enhanced without being limited by pillar height issues. Therefore, this work provides important insight into the enhanced performance of 3D structures.

Toward High Rate Performance Solid‐State Batteries

“…[168] Recently, Li et al investigated a new 3D pillar design for the ASSBs via the electrochemical model (Figure 13a). [169] The 3D pillar design could increase the contact area and enable the high utilization of active materials. However, the advantage of this structure is limited because of the increase of ohmic resistances as the height of the filler increases.…”

“…For example, Chen et al reported a 3D lightweight, flexible copper-clad carbon framework (CuCF) as a current collector for Li metal anodes (Figure 13b). [172] The CuCF was fabricated by electroplating a Cu layer onto the surface of the carbon fiber, and the obtained [169] Copyright 2022, Wiley-VCH. b) Cross-sectional SEM image of a single carbon framework (CF) fiber coated with Cu layer.…”

“…a) Schematic illustration of the 3D pillar design for the ASSBs with or without 3D current collector. Reproduced with permission [169]. Copyright 2022, Wiley-VCH.…”

Porous Carbon with Alumina Coating Nanolayer Derived from Biomass and the Enhanced Electrochemical Performance as Stable Anode Materials

“…The abundance and low cost of biomass-derived carbon make it an ideal candidate for use in supercapacitors [ 30 ], LIBs [ 31 ], and sodium ion batteries SIBs [ 15 ] to address the challenges mentioned above. Additionally, porous nanostructured carbon biomass can serve as an interface between the lithium electrode and the electrolyte, allowing charge to transfer [ 32 , 33 ]. A graphite electrode with a theoretical value of 372 mAh g −1 was determined, which is lower to fulfill the current demands.…”