EVALUATION METHOD FOR BATTERY CONSTITUTING MATERIAL, AND BATTERY MATERIAL SELECTED IN THE METHOD

摘要

PROBLEM TO BE SOLVED: To improve the performance of a lithium ion battery in short term by improving evaluation relying on experience in prior arts, when selecting and evaluating electrode material of the lithium ion battery and establishing a theoretically selecting method, in order to improve charging/discharging characteristic. SOLUTION: Surface free energy of a material constituting a lithium ion battery is measured, wettability value between both materials of active material and binder and an electrolyte is calculated from the values of the surface free energy, a contact angle between the electrolyte and the binder, and a contact angle between the electrolyte and the active material, and thereby optimization of combination of electrode materials affecting charging/discharging characteristic of lithium ion battery can be estimated.