Abstract
All-solid-state batteries (ASSBs) are a promising response to the need for safety and high energy density of large-scale energy storage systems in challenging applications such as electric vehicles and grid integration. ASSBs based on sulfide solid electrolytes (SEs) have attracted much attention because of their high ionic conductivity and wide electrochemical windows of the sulfide SEs. Here, we study the electrochemical performance of ASSBs using composite electrodes prepared via two processes (simple mixture and solution processes) and varying the ionic conductor additive (80Li2S∙20P2S5 and argyrodite-type Li6PS5Cl). The composite electrodes consist of lithium-silicate-coated LiNi1/3Mn1/3Co1/3O2 (NMC), a sulfide SE, and carbon additives. The charge-transfer resistance at the interface of the solid electrolyte and NMC is the main parameter related to the ASSB’s status. This value decreases when the composite electrodes are prepared via a solution process. The lithium silicate coating and the use of a high-Li-ion additive conductor are also important to reduce the interfacial resistance and achieve high initial capacities (140 mAh g−1).
Highlights
The results suggest that intimate contact, obtained during the solution process, was the key to enhancing the electrochemical performance of the batteries
1b), lithium silicate (LS)-coated is dispersed in a solution of the solid electrolyte, the composite electrode is obtained after solvent removal
Composite electrodes containing LS-coated NMC, a sulfide solid electrolyte, and carbon additives were prepared via two procedures: simple mixture, and solution process
Summary
Lithium-ion batteries offer the highest volumetric and gravimetric energy density among currently used electrochemical storage systems. Such batteries have widely been used as power sources for portable devices such as computers, mobile phones, and digital cameras; recently, these batteries have been extensively used as energy storage devices for electric vehicles and substations. All-solid-state batteries (ASSBs) offer high energy density, accompanied by solutions for critical safety concerns. These devices still have many unsolved problems that keep them from commercialization, such as interfacial instability, lithium dendrite formation, and lack of mechanical integrity during cycling [3,4]
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