AGM --- membrane sandwich

AGM — membrane sandwich. The combination of a membrane with an AGM separator has been investigated with a view towards controlling the oxygen transport as well as improving the compressive properties of the separator. With reference to the latter aspect, a AGM-membrane sandwich has been evaluated [19]. The AGM consisted of 100% fine fibres, and the incompressible polymer membrane was a mixture of polyvinyl chloride and 5-10 wt.% silica, which was partly extracted to increase the pore size and porosity. The properties of the two separator components are summarized in Table 7.9 [22]. 

The cell configuration, illustrated in Fig. 7.2, placed a layer of the AGM in contact with each electrode and the membrane was located between the two layers of AGM. The compressive force in the cells, applied on the dry separator, was 50 kPa, and cycling was performed to 75% DoD (3 h at O.25C5). Under these conditions, the cells 

El High surface-area layer Low surface-area layer 

Property Micro-glass fibre Organic membrane 

The above results indicate that hybrid separators are more of an advantage for the battery production process than for improving battery performanee. 

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