Safety enhanced li-ion and lithium metal battery cells having protected lithium electrodes with enhanced separator safety against dendrite shorting
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. A safety enhanced lithium ion or lithium metal battery cell comprising:
a lithium ion cathode; and
a protected lithium anode comprising,
an anode comprising a material selected from the group consisting of a lithium metal, lithium metal-ion, lithium metal alloy, lithium metal alloying metal, and lithium metal intercalating material; and
a protective architecture, the protective architecture comprising a first lithium ion conducting separator layer and a second lithium ion conducting layer;
wherein the first lithium ion conducting separator layer further comprises a lithium ion conducting anolyte, and the second lithium ion conducting layer prevents the anode from direct contact with electrochemically active material on the cathode.
2. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anode comprises lithium metal.
3. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anode comprises lithium metal intercalating material.
4. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anode comprises lithium metal alloying metal.
5. The safety enhanced lithium ion or lithium metal battery cell of claim 4 wherein the lithium metal alloying metal is silicon or tin.
6. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anolyte is a liquid electrolyte.
7. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anolyte is a gel electrolyte.
8. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the anolyte is a polymer electrolyte.
9. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the first lithium ion conducting separator layer further comprises glass or ceramic particles.
10. The safety enhanced lithium ion or lithium metal battery cell of claim 9 wherein the glass or ceramic particles are reactive to lithium metal in contact to getter any shorting dendrites that grow as a result of cell cycling.
11. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the second lithium ion conducting layer directly contacts the lithium ion cathode.
12. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the lithium ion cathode is a metal oxide.
13. The safety enhanced lithium ion or lithium metal battery cell of claim 12 wherein the metal oxide comprises LiCoO 2 .
14. The safety enhanced lithium ion or lithium metal battery cell of claim 12 wherein the metal oxide comprises LiNiO 2 .
15. The safety enhanced lithium ion or lithium metal battery cell of claim 12 wherein the cell further comprises a liquid electrolyte in direct contact with the lithium ion cathode.
16. The safety enhanced lithium ion or lithium metal battery cell of claim 15 wherein the liquid electrolyte in direct contact with the lithium ion cathode does not contact the anode.
17. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the second lithium ion conducting layer is a tape cast layer.
18. The safety enhanced lithium ion or lithium metal battery cell of claim 17 wherein the tape cast layer comprises a garnet lithium ion conductor.
19. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the second lithium ion conducting layer comprises a garnet lithium ion conductor.
20. The safety enhanced lithium ion or lithium metal battery cell of claim 1 wherein the second lithium ion conducting layer comprises a ceramic lithium ion conductor comprising lithium titanium phosphate.