Commercialized lithium-ion rechargeable batteries have several advantages, such as a high operating voltage, a high energy density and relatively good cycle durability. However, the use of a flammable and easily leaking liquid electrolyte is unavoidable in the present lithium ion cells. Nowadays, in order to solve the low stability of lithium ion cell at relatively high temperature region, it is thought that the improvement of the thermal stability of the separator is necessary.In this study, we have attempted a development of new, highly thermostable polymer monolithic separator with high ionic conductivity made by phase separation with the cross-linking reaction using epoxy and amine compounds in the presence of polyethylenglycole as a porogen. We successfully controlled the monolithic pore size of the membrane in the range from sub-micron to micron with a relatively sharp pore-size distribution. Thus obtained monolithic separator has a good electrolyte absorbent property and demonstrated to show a high ionic conductivity, good mechanical strength, high flexibility, excellent heat resistance at 150 oC or more and have the ability to inhibit lithium metal dendrite generation. We will demonstrat the preparation method, physicochemical properties of monolithic separator and lithium cell performances using this separator in this poster session.Figure 1. SEM images of monolithic polymer separator (cross-section).

Development of a thermostable polymer monolith separator for high performance lithium ion battery

248th National Meeting (2014)

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