| 摘要 |
<p>The present invention relates to a thermoplastic fluororesin porous body which is light in weight and has outstanding characteristics such as mechanical properties, without employing special equipment or a special method, and also a battery cell employing this porous body. The thermoplastic fluororesin porous body is obtained by melt extrusion of a thermoplastic fluororesin in a sheet form or hollow form, after which its degree of crystallization is optionally raised to at least 40 % by heat treatment, following which it is cold drawn, and numerous flattened fine pores produced, by means of which the apparent specific gravity is made no more than 1.7. In the battery cell, the above thermoplastic fluororesin porous body can be carried out for the construction of the separator and/or at least one of the electrodes.</p> |
