Abstract: A method for making an electrode for a battery includes: providing a current collector having a current collector surface; forming an electrode precursor by arranging a plurality of extruded electrode elements on the current collector surface, each electrode element defining an element height above the current collector surface, and neighbouring electrode elements being separated by a spacing; and forming an electrode from the electrode precursor by compressing the electrode elements, thereby reducing the element height of each electrode element and closing the spacing until neighbouring electrode elements meet to form an electrode layer.

Abstract: Apparatus for making an electrode-electrolyte structure includes: a die head defining a substrate pathway for passage of an electrode substrate through the die head from a substrate inlet to a substrate outlet, and an electrolyte pathway for passage of an electrolyte gel through the die head; an electrode feeder for feeding an electrode substrate along the substrate pathway; and an electrolyte feeder for feeding a polymer gel electrolyte along the electrolyte pathway. The electrolyte pathway is arranged to meet the substrate pathway at a junction arranged between the substrate inlet and the substrate outlet, to extrude the electrolyte onto the electrode substrate as it is fed along the substrate pathway.