Electrochemical relation with expansion behavior in in-situ load cell system for anode materials

摘要

Si-based electrode system has been suggested for new anode material in next generation of Li-ion rechargeable battery. However, it has poor mechanical properties (～250% of lattice volume expansion) and that will be challenged in applications for Si-based anode materials. In order to overcome the mechanical problems of metal anode system, we have tried to find the optimum condition of electrode structure for accommodating the anode lattice expansion effectively. Consequently, the load cell system was newly found and employed for evaluating the swelling of metal anode by in-situ mode. Mechanical and electrochemical characterization of specified Si-based electrode system was carried out by load cell system. The several physico-chemical parameters in real cell (cylindrical 18650 type cell) system has been derived from examining the effects of loading pressure and other electrochemical factors on electrochemical and physical properties of porous electrode. Eventually, we could successively design the electrode with optimized porosity, which has been simulated by load cell evaluation.