Lithium electrochemical accumulator having a specific bipolar architecture
The invention relates to an electrochemical lithium accumulator comprising at least one first electrochemical cell and at least one second electrochemical cell separated from each other by a current-collecting substrate, which substrate supports on a first face, an electrode of said first electrochemical cell, and on its second face opposite to said first face, an electrode of opposite sign of said second electrochemical cell, each cell comprising a positive electrode and a negative electrode separated by an electrolyte, characterized inter alia in that said current-collecting substrate is in copper or in copper alloy.
1. A lithium electrochemical accumulator comprising bipolar architecture comprising at least one first electrochemical cell and at least one second electrochemical cell separated from each other by a current-collecting substrate, which current-collecting substrate supports on a first face an electrode of said first electrochemical cell and on a second face opposite to said first face, an electrode of opposite sign of said second electrochemical cell, each electrochemical cell comprising a positive electrode and a negative electrode separated by an electrolyte, wherein:
said current-collecting substrate is an integral copper or copper alloy substrate wherein the copper or copper alloy is in contact with each of the electrode supported on the first face and the electrode supported on the second face;
the negative electrode comprises a material selected from:
metal oxide compounds of formula M x O y with M representing an element selected from Ti, Cr, Mn, Fe, Co, Ni, Cu, Mo, W and mixtures thereof, x and y being positive integers selected so that the total charge of the cations compensates for the total charge of the anions so that the compound is electrically neutral;
lithium metal or an alloy comprising lithium metal;
tin metal; and
mixtures thereof; and
the positive electrode comprises a material selected from:
elemental sulfur;
sulfide compounds;
and mixtures thereof.
2. The accumulator according to claim 1 , wherein:
the positive electrode comprises elemental sulfur; and
the negative electrode comprises lithium metal or an alloy comprising lithium metal.
3. The accumulator according to claim 1 , wherein the electrolyte is a liquid electrolyte comprising a lithium salt.
4. The accumulator according to claim 3 , wherein the lithium salt is selected from LiPF 6 , LiClO 4 , LiBF 4 , LiAsF 6 , LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 3 , LiN(C 2 F 5 SO 2 ), lithium bistrifluoromethylsulfonylimide LiN[SO 2 CF 3 ] 2 and mixtures thereof.
5. The accumulator according to claim 3 , wherein the electrolyte comprises one or more solvents from the family of carbonates and/or from the family of ethers.
6. The accumulator according to claim 2 , wherein the electrolyte is a liquid electrolyte comprising a lithium salt.
7. The accumulator according to claim 6 , wherein the electrolyte comprises one or more solvents from the family of carbonates and/or from the family of ethers.
8. The accumulator according to claim 2 , wherein the negative electrode comprises lithium metal.
9. The accumulator according to claim 2 , wherein the negative electrode comprises an alloy comprising lithium metal.
10. The accumulator according to claim 1 , wherein the current-collecting substrate consists of copper.
11. The accumulator according to claim 10 , wherein:
the positive electrode comprises elemental sulfur; and
the negative electrode comprises lithium metal or an alloy comprising lithium metal.
12. The accumulator according to claim 10 , wherein the electrolyte is a liquid electrolyte comprising a lithium salt.
13. The accumulator according to claim 11 , wherein the negative electrode comprises lithium metal.
14. The accumulator according to claim 11 , wherein the negative electrode comprises an alloy comprising lithium metal.
15. The accumulator according to claim 1 , wherein the current-collecting substrate consists of copper alloy.
16. The accumulator according to claim 15 , wherein:
the positive electrode comprises elemental sulfur; and
the negative electrode comprises lithium metal or an alloy comprising lithium metal.
17. The accumulator according to claim 15 , wherein the electrolyte is a liquid electrolyte comprising a lithium salt.
18. The accumulator according to claim 16 , wherein the negative electrode comprises lithium metal.
19. The accumulator according to claim 16 , wherein the negative electrode comprises an alloy comprising lithium metal.