Protected lithium electrodes having tape cast ceramic and glass-ceramic membranes
Alkali (or other active) metal battery and other electrochemical cells incorporating active metal anodes together with aqueous cathode/electrolyte systems. The battery cells have a highly ionically conductive protective membrane adjacent to the alkali metal anode that effectively isolates (de-couples) the alkali metal electrode from solvent, electrolyte processing and/or cathode environments, and at the same time allows ion transport in and out of these environments. Isolation of the anode from other components of a battery cell or other electrochemical cell in this way allows the use of virtually any solvent, electrolyte and/or cathode material in conjunction with the anode. Also, optimization of electrolytes or cathode-side solvent systems may be done without impacting anode stability or performance. In particular, Li/water, Li/air and Li/metal hydride cells, components, configurations and fabrication techniques are provided.
1. A method of making an electrochemical cell structure, the method comprising:
tape-casting an inherently ionically conductive substantially impervious alkali metal ion ionically conducting membrane selected from the group consisting of a glass-ceramic and a glass, the membrane having a first surface and a second surface; and
assembling the tape-cast inherently ionically conductive protective membrane with an alkali metal anode adjacent to the first surface
wherein the membrane effectively isolates the alkali metal anode from environments deleterious to the alkali metal while allowing transport of ions of the alkali metal from the first surface to the second surface, the membrane having conductivity for ions of the anode alkali metal of at least 10 −6 S/cm.
2. The method of claim 1 , wherein the tape-cast ionically conductive membrane is a glass-ceramic.
3. The method of claim 1 , wherein the tape-cast ionically conductive membrane is a glass.
4. The method of claim 1 , wherein following tape-casting, the ionically conductive membrane is fired to full density.
5. The method of claim 1 , wherein the electrochemical cell structure further comprises a support structure.
6. The method of claim 5 , wherein the tape-cast ionically conductive membrane is disposed on the support structure.
7. The method of claim 6 , wherein the support structure is porous.
8. The method of claim 7 , wherein the support structure is selected from the group consisting of a polymeric support, a metal support, a glass support, a glass-ceramic support, and a ceramic support.
9. The method of claim 1 , wherein the alkali metal is lithium.