Assessing the critical current density of all-solid-state Li metal symmetric and full cells

Jang

et al. 2023

Adv Funct Materials

Self Cite

The dry process is a promising fabrication method for all‐solid‐state batteries (ASSBs) to eliminate energy‐intense drying and solvent recovery steps and to prevent degradation of solid‐state electrolytes (SSEs) in the wet process. While previous studies have utilized the dry process to enable thin SSE films, systematic studies on their fabrication, physical and electrochemical properties, and electrochemical performance are unprecedented. Here, different fabrication parameters are studied to understand polytetrafluoroethylene (PTFE) binder fibrillation and its impact on the physio‐electrochemical properties of SSE films, as well as the cycling stability of ASSBs resulting from such SSEs. A counter‐balancing relation between the physio‐electrochemical properties and cycling stability is observed, which is due to the propagating behavior of PTFE reduction (both chemically and electrochemically) through the fibrillation network, resulting in cell failure from current leakage and ion blockage. By controlling PTFE fibrillation, a bilayer configuration of SSE film to enable physio‐electrochemically durable SSE film for both good cycling stability and charge storage capability of ASSBs is demonstrated.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physio‐Electrochemically Durable Dry‐Processed Solid‐State Electrolyte Films for All‐Solid‐State Batteries

Jang

et al. 2023

Adv Funct Materials

Self Cite

“…As in a symmetric cell, the cathode side of the full cell cannot compensate for the expansion and contraction of electrodes caused by lithium metal plating and stripping during cell cycling. The volume change in full lithium metal cells is unavoidable . To that end, we studied the impact of the Ag–C interlayer in full cells using NMC single crystal cathodes.…”

Section: Uniform Current Distribution Between the LI Anode And Solid ...mentioning

confidence: 99%

Understanding the Chemomechanical Function of the Silver–Carbon Interlayer in Sheet-type All-Solid-State Lithium–Metal Batteries

Emley

Zhao

et al. 2023

Nano Lett.

All-solid-state batteries with lithium metal anodes hold great potential for high-energy battery applications. However, forming and maintaining stable solid–solid contact between the lithium anode and solid electrolyte remains a major challenge. One promising solution is the use of a silver–carbon (Ag–C) interlayer, but its chemomechanical properties and impact on interface stabilities need to be comprehensively explored. Here, we examine the function of Ag–C interlayers in addressing interfacial challenges using various cell configurations. Experiments show that the interlayer improves interfacial mechanical contact, leading to a uniform current distribution and suppressing lithium dendrite growth. Furthermore, the interlayer regulates lithium deposition in the presence of Ag particles via improved Li diffusivity. The sheet-type cells with the interlayer achieve a high energy density of 514.3 Wh L–1 and an average Coulombic efficiency of 99.97% over 500 cycles. This work provides insights into the benefits of using Ag–C interlayers for enhancing the performance of all-solid-state batteries.

Advanced Energy Materials

“…[38,138] Alignment of the cell components, including electrodes and SSE films, is crucial, considering that the subsequent step is pressurization with pressures of hundreds of megapascals, which may cause mechanical failure and subsequent ISC in ASSBs. [54,183] In this regard, SSE films with robustness and flexibility (if folding is involved) are needed.…”

Section: For Cell Assembly Processmentioning

confidence: 99%

“…Enabling Li metal anodes is crucial for the success of ASSBs with high energy densities. [45,150,152,153,183] However, the poor intrinsic reduction stabilities of SSEs and the correlated electrochemomechanical issues at the interfaces remain highly challenging to overcome. [54,57,58] Comprehensive reviews on the interfacial evolution and engineering in ASSBs employing Li metal anodes can be found in the cited references.…”

Section: Sse Films For LI Metal Anodementioning

confidence: 99%

Dimensional Strategies for Bridging the Research Gap between Lab‐Scale and Potentially Practical All‐Solid‐State Batteries: The Role of Sulfide Solid Electrolyte Films

Song,

Baeck,

Kwak

et al. 2023

The absence of liquid components in all‐solid‐state batteries (ASSBs) based on sulfide solid electrolytes (SSEs) significantly impacts manufacturing processes and performance, particularly concerning mechanical properties and evolution. SSE films play vital roles in this context. This review provides a comprehensive analysis of SSE film design strategies, emphasizing their significance in the cell assembly and operation of practical ASSBs. Essential SSE film components are examined, including SSEs, binders, and scaffold or substrate materials, and key characteristics related to ASSB assembly and operation are addressed, such as conduction properties, electrochemical stability, and mechanical properties. Various SSE films fabricated using different binders and scaffold or substrate materials are explored through slurry‐casting or solvent‐free methods, and ASSBs employing SSE films with diverse form factors and components are presented, emphasizing their ability to operate under low‐pressure conditions. Additionally, the importance of establishing test protocols for assessing SSE film performance metrics is highlighted and strategies for enabling Li metal anodes are introduced. By deepening the understanding of the electrochemo‐mechanical phenomena and engineering processes in ASSBs, it is anticipated that the gap between lab‐scale research and practical goals can be bridged through design strategies that leverage the hybridization of various compositions and the immiscible nature of solid‐state materials.