MICROPOROUS SOLID ELECTROLYTES AND METHODS FOR PREPARING THEM

摘要

The present invention is directed to an electrolyte film and/or a solid electrolyte, having a microporous structure, for a rechargeable cell. According to the present invention, when preparing the electrolyte film and/or the solid electrolyte, an inorganic absorbent is added in the amount of more than 70 % by weight in a polymer matrix to prevent the porous structure from being destructed at the cell-assembling process such as lamination or pressing, whereby the absorbing power of a liquid electrolyte to the solid electrolyte film and the ionic conductivity can be maintained. The inorganic absorbent contained over the specific amount, together with the microporous structure, improves the capacity of absorbing the liquid electrolyte and, in particular, works as a structure element of increasing the mechanical strength of electrolyte film and/or solid electrolyte. Therefore, the good ionic conductivity can be maintained even after the assembly of cell.