IEST Instruments

For silicon-based anode materials, this paper proposes to characterize the influence of manufacturing process on the structure of silicon-based anode materials by the method of slurry gas production, and quantify the degree of destruction of surface coating and particles of silicon-based anode materials powder by different pressures with in-situ gas production volume monitor(GVM2200), which provides a new way of characterizing the coating strength of silicon-based anode materials, and at the same time, can also optimize the manufacturing process of electric cell through the quantitative indicators, so as to improve the performance of the cell. It can also be used to optimize the manufacturing process of battery cell through the quantitative indexes, thus improving the performance of battery cell.

In the sulfide/halide system of #solidstatebatteries, the cathode electrode layer, anode electrode layer, electrolyte layer are all prepared using solid powder, and pressurized molding under high pressure conditions, the contact between particles and particles belongs to hard contact. The expansion and contraction of the particles during the charging and discharging process leads to a more serious volume change behavior in the actual charging and discharging process of solid-state batteries than that of liquid batteries. However, less research has been done in this area. In this paper, IEST has tested the expansion behavior of sulfide solid-state battery during charging and discharging by using a Solid Electrolyte Test System(SEMS) and a In-Situ Silicon-Based Anode Swelling Rapid Screening System(RSS).

IEST provides a simple and fast method to determine the lithium plating window: A thickness expansion meter with a resolution of 0.1 µm was designed to accurately measure thickness changes during battery cycling. Under a given cycling condition, it plots the battery thickness-SOC curve when the battery is charged and discharged at constant pressure or constant gap. In the case of lithium plating, an abnormal increase in cell thickness can be clearly observed. The change in cell thickness can be used as an indicator for non-destructive lithium plating detection. The thickness indicator has higher sensitivity compared to methods based on capacity, impedance, voltage, etc., and can give rapid results.

The team of Assistant Professor Lin Jie and Professor Peng Dongliang from Xiamen University took silicon anodes as the research object. Inspired by the anti-rust principle of stainless steel, they introduced a “bulk passivation” to stabilize the interface of silicon anodes (as shown in Figure 1), and obtained ultra-high specific capacity and cycle performance. At the same time, through non-in-situ characterization (XPS, TEM, SEM), model coin cell in-situ expansion equipment (IEST), finite element simulation, capacity differential contour map, etc., the passivation mechanisms of “single silicon”, “layer and silicon” (LiF/Li₂CO₃ coated Si), and “composite silicon” (Si/LiF/Li₂CO₃ overall composite) were systematically compared. 

This paper is mainly based on four LiCoO2 powder materials with different particle size distributions, testing the resistivity and compaction density of the powder under different pressures, and combining scanning electron microscopy testing to analyze the changes in the mechanical-electrical properties of lithium cobalt oxide powders. At the same time, combined with the experimental results, a discrete element model corresponding to the four lithium cobalt oxide powders is established to give a theoretical explanation for the mechanical-electrical changes of LiCoO2 powders during the compaction process.

This article mainly combines the compaction density measurement under different pressurization methods to evaluate the impact of differences in measurement methods on test results.

This article mainly combines the NCM523 series lithium-ion battery powder materials, combines the binder PVDF and the conductive agent SP for powder layer premixing, and evaluates the conductivity properties of the mixed powder. At the same time, the slurry is prepared and coated on the powders with the same ratio, and the conductivity properties of the finished electrode is evaluated. The influence of the conductive agent on the conductive performance of each layer is clarified, and its correlation is preliminarily explored.

In this study, the electrochemical performance of lithium-rich manganese-based cathode materials (LMOs) was significantly improved by constructing an ionic-electronic dual-conductor (IEDC) interface combining a graphene framework with high electronic conductivity and a heterogeneous epitaxial structure of spinel Li4Mn5O12 with high ionic conductivity.

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In this paper, we experimentally and introduce empirical equations to quantitatively measure the elastic-plastic mechanical behavior of LCO powders during compaction.