Protected lithium electrodes having a polymer electrolyte interlayer and battery cells thereof
Active metal and active metal intercalation electrode structures and battery cells having ionically conductive protective architecture including an active metal (e.g., lithium) conductive impervious layer separated from the electrode (anode) by a porous separator impregnated with a non-aqueous electrolyte (anolyte). This protective architecture prevents the active metal from deleterious reaction with the environment on the other (cathode) side of the impervious layer, which may include aqueous or non-aqueous liquid electrolytes (catholytes) and/or a variety electrochemically active materials, including liquid, solid and gaseous oxidizers. Safety additives and designs that facilitate manufacture are also provided.
1. An electrochemical cell structure, comprising:
an anode comprising a material selected from the group consisting of an active metal, active metal-ion, active metal alloy, active metal alloying metal and active metal intercalating material; and
an ionically conductive protective architecture on a first surface of the anode, the architecture comprising,
an active metal ion conducting polymeric separator layer comprising a polymer electrolyte, the polymeric separator layer being chemically compatible with the active metal anode, and in contact with the anode, and
a substantially impervious ionically conductive layer chemically compatible with the polymeric separator layer, and in contact with the polymeric separator layer.
2. The structure of claim 1 , wherein the anode initially comprises an uncharged intercalation material.
3. The structure of claim 2 , wherein the uncharged intercalation material comprises carbon.
4. The structure of claim 1 , wherein the anode initially comprises an uncharged alloying metal.
5. The structure of claim 1 , wherein the substantially impervious ionically conductive layer comprises a glass-ceramic active metal ion conductor.
6. The structure of claim 5 , wherein substantially impervious ionically conductive layer is an ion conductive glass-ceramic having the following composition:
Composition
mol %
P 2 O 5
26-55%
SiO 2
0-15%
GeO 2 + TiO 2
25-50%
in which GeO 2
0-50%
TiO 2
0-50%
ZrO 2
0-10%
M 2 O 3
0-0%
Al 2 O 3
0-15%
Ga 2 O 3
0-15%
Li 2 O
3-25%
and containing a predominant crystalline phase composed of Li 1+x (M,Al,Ga) x (Ge 1−y Ti y ) 2−x (PO 4 ) 3 where X≦0.8 and 0≦Y≦1.0, and where M is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, and/or Li 1+x+y Q x Ti 2−x Si y P 3−y O 12 where 0<X≦0.4 and 0≦Y≦0.6, and where Q is Al or Ga.
7. The structure of claim 1 , wherein the active metal anode is selected from the group consisting of lithium metal, lithium metal alloy and lithium intercalation material.
8. The structure of claim 7 , wherein the active metal anode is lithium metal.
9. The structure of claim 1 , wherein the anode comprises lithium metal-ions.
10. The structure of claim 1 , wherein the anode comprises lithium metal alloying metal.
11. The structure of claim 10 , wherein the lithium metal alloying metal is selected from the group consisting of Ca, Mg, Sn, Ag, Zn, Bi, Al, Cd, Ga, In and Sb.
12. The structure of claim 1 , wherein the anode comprises lithium metal intercalating material.
13. The structure of claim 12 , wherein the lithium metal intercalating material comprises carbon.
14. The structure of claim 1 , wherein the protective architecture has an ionic conductivity of at least 10 −4 S/cm.
15. A battery cell, comprising:
an electrochemical cell structure in accordance with claim 1 ; and
a cathode structure.
16. The cell of claim 15 , wherein the cathode structure comprises a catholyte selected from the group consisting of aqueous and non-aqueous electrolytes.
17. The cell of claim 16 , wherein the cathode structure further comprises electrochemically active material selected from the group consisting of solid, liquid and gaseous oxidizers.
18. The cell of claim 15 , wherein the cathode structure comprises seawater.
19. The cell of clam 15 , wherein the cathode structure comprises an air electrode.
20. The cell of claim 15 , wherein the cathode structure comprises an ionic liquid.