| CPC H01M 50/449 (2021.01) [H01G 9/0029 (2013.01); H01G 11/52 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/136 (2013.01); H01M 4/38 (2013.01); H01M 4/382 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 8/02 (2013.01); H01M 8/0245 (2013.01); H01M 8/1016 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 10/0585 (2013.01); H01M 12/08 (2013.01); H01M 50/403 (2021.01); H01M 50/411 (2021.01); H01M 50/414 (2021.01); H01M 50/431 (2021.01); H01M 50/434 (2021.01); H01M 50/437 (2021.01); H01M 50/446 (2021.01); H01M 50/457 (2021.01); H01M 50/463 (2021.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 10/052 (2013.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/494 (2021.01); H01M 2300/0037 (2013.01); H01M 2300/004 (2013.01); H01M 2300/0071 (2013.01); Y10T 29/49108 (2015.01)] | 22 Claims |

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1. An electrochemical cell comprising:
a solid positive electrode comprising a positive current collector;
a solid negative electrode comprising a negative current collector;
a solid membrane between the negative electrode and the positive electrode;
wherein the solid membrane comprises a solid electrolyte layer; and
at least one electronically and ionically conductive layer between the negative electrode and the solid electrolyte layer;
wherein the at least one electronically and ionically conductive layer is in direct physical contact with the solid electrolyte layer; and
wherein the at least one electronically and ionically conductive layer comprises both a carbon material and at least one metal or metal alloy;
wherein the at least one metal or metal alloy comprises a lithium alloy; and
wherein said at least one electronically and ionically conductive layer comprises at least one coating on the solid electrolyte layer or on the negative electrode.
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