LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery which can keep an electric connection between active material layers and separators without using a strong case, which can be formed to any shape such as the one with a high energy density or a small thickness, and which has an excellent charging and discharging characteristic and has a large capacity for cell. Positive and negative active material particles are joined to a positive and a negative collectors respectively using binder resin to form a positive pole and a negative pole. Positive and negative active material layers and separators are so joined with binder resin that the junction strength between the separator and the positive active material layer, and between the separator and the negative active material layer, may be at least the same as that between the positive collector and the positive active material layer, and between the negative collector and the negative active material layer, to form a flat multilayer battery body with a plurality of electrode laminates. Electric connection between the electrodes can be obtained by keeping an electrolytic solution including lithium ions in spaces between the positive active material layers and the separators, and between the negative active material layers and the separators.