Development of gel-type polymer electrolyte lithium secondary batteries

摘要

The rapid progress and widespread use of portable electronic devices have increased the demand for lithium-ion batteries, because they are light and offer high voltage and high energy density. Also, as electronic devices continue to becomesmaller, thinner and more flexible, thin-type batteries are urgently needed.In order to develop thin-type batteries with a soft, laminated case, a number of gel-type polymer materials and electrolyte compositions were investigated. We developed a cross-linked PEO as a gel-type polymer electrolyte. It features better reliabilityagainst electrolyte leakage and greater electrolyte retainability than PVdF, PMMA, etc. Cross-linked PEO made it possible to develop a polymer battery only 3.5 mm thick with excellent cycle performance.