Three dimensional co-extruded battery electrodes
View Patent ↗A three dimensional electrode structure having a first layer of interdigitated stripes of material oriented in a first direction, and a second layer of interdigitated stripes of material oriented in a second direction residing on the first layer of interdigitated stripes of material. A method of manufacturing a three dimensional electrode structure includes depositing a first layer of interdigitated stripes of an active material and an intermediate material on a substrate in a first direction, and depositing a second layer of interdigitated stripes of the active material and the intermediate material on the first layer in a second direction orthogonal to the first direction.
1. A three-dimensional electrode structure, comprising:
a first layer of contiguous, separated, interdigitated stripes of an active, extrudate, electrode paste material and an intermediate material, the interdigitated stripes oriented in a first direction; and
a second layer of contiguous, separated, interdigitated stripes of an active, lithium oxide, extrudate paste material and the intermediate material oriented in a second direction residing on the first layer of interdigitated stripes of material, wherein the second layer is arranged to shorten a transport distance for lithium ions in the lithium extrudate paste material, and the intermediate material consists of one of either a liquid or gel electrolyte, or a porous material filled with electrolyte.
2. The three-dimensional electrode structure of claim 1 , wherein the stripes of active material are wider than the stripes of the intermediate material.
3. The three-dimensional electrode structure of claim 1 , wherein the stripes of active material and the stripes of intermediate material have the same width.
4. The three-dimensional electrode structure of claim 1 , wherein the second layer of interdigitated stripes has a symmetric distribution of stripes with the first layer.
5. The three-dimensional electrode structure of claim 1 , wherein the second layer of interdigitated stripes has an asymmetric distribution of stripes with the second layer.
6. The three-dimensional electrode structure of claim 1 , wherein the first and second layers have different dimensions.
7. The three-dimensional electrode structure of claim 1 , further comprising a third layer of interdigitated stripes of material oriented in the first direction.
8. The three-dimensional electrode structure of claim 1 , wherein the three-dimensional electrode structure has a thickness of more than 100 micrometers.