Due to its unique advantages such as high theoretical capacity (4200mAh/g) and abundant resources, silicon (Si) anode material is expected to replace the currently widely used graphite anode and become the main anode material¹⁻² for next-generation lithium-ion batteries. At present, silicon-based anodes that are most likely to be commercialized on a large scale are silicon-carbon anodes and silicon-oxygen anodes. Although both have high specific capacities, due to the alloying and deintercalation mechanism of silicon, the structural expansion brought about by them is also very significant. Larger structural expansion will destroy the original solid electrolyte interface film (Solid Electrolyte Interface, SEI) on the surface of the silicon material, which will lead to the continuous destruction and regeneration of the SEI film during cycle charge and discharge, and consume a large amount of electrolyte, which will eventually lead to a decrease in battery capacity. fast decay². Therefore, to evaluate the performance of a silicon material, in addition to its gram capacity, first effect, and cycle efficiency, it is also very important to evaluate its expansion performance.

The existing expansion evaluation methods need to prepare silicon anode materials into soft packs or laminated cells, and then monitor the in-situ expansion through force-applying structures and high-precision sensors. However, the preparation from powder materials to finished cells requires not only Mature cell production lines, and the evaluation cycle is also very long, so how to quickly evaluate the expansion performance of a silicon material has become a thorny issue that plagues many material developers.In addition, this device is also compatible with the conventional expansion test of small-sized soft packs & laminated cells (100*100mm), which truly achieves a multi-purpose machine!

The four-channel silicon-based anode expansion in-situ fast screening system(as shown in Figure)draws on the assembly mode of the button battery and successfully realizes the direct measurement of the expansion performance of the silicon anode at the electrode end, and saves the need to prepare the finished battery. The manpower, material and time costs required for the core, accurately evaluate the most important performance indicators of silicon anode materials with the smallest consumption and the fastest efficiency, making your research and development one step faster!

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