Member for electrochemical devices, and electrochemical device
Disclosed is a member for electrochemical devices comprising a current collector, an electrode mixture layer provided on the current collector, and an electrolyte layer provided on the electrode mixture layer in this order, wherein the electrode mixture layer comprises an electrode active material, a polymer having a structural unit represented by the following formula (1), at least one electrolyte salt selected from the group consisting of lithium salts, sodium salts, calcium salts, and magnesium salts, and a molten salt having a melting point of 250° C. or less, and the electrolyte layer comprises an inorganic solid electrolyte: wherein X − represents a counter anion.
1. A member for electrochemical devices comprising a current collector, an electrode mixture layer provided on the current collector, and an electrolyte layer provided on the electrode mixture layer in this order,
wherein the electrode mixture layer comprises an electrode active material, a polymer having a structural unit represented by the following formula (1), at least one electrolyte salt selected from the group consisting of lithium salts, sodium salts, calcium salts, and magnesium salts, and a molten salt having a melting point of 250° C. or less, and
the electrolyte layer comprises an oxide-based inorganic solid electrolyte, and
wherein the electrode mixture layer contacts the electrolyte layer:
wherein X − represents a counter anion.
2. The member for electrochemical devices according to claim 1 , wherein the oxide-based inorganic solid electrolyte is an oxide represented by the following formula (2):
Li 7−b La 3−a A 1 a Zr 2−b M 1 b O 12 (2)
wherein A 1 represents at least one metal element selected from the group consisting of Y, Nd, Sm, and Gd, and
wherein M 1 represents at least one metal element selected from the group consisting of Nb and Ta, 0≤a<3, and 0≤b<2.
3. The member for electrochemical devices according to claim 1 , wherein the oxide-based inorganic solid electrolyte is an oxide represented by the following formula (3):
Li 1+c+d Al c (Ti,Ge) 2−c Si d P 3−d O 12 (3)
wherein 0≤c<2 and 0≤d<3.
4. The member for electrochemical devices according to claim 1 , wherein a content of the polymer in the electrode mixture layer is 10 to 30% by mass based on a total amount of the polymer, the electrolyte salt, and the molten salt.
5. The member for electrochemical devices according to claim 1 , wherein an anion of the electrolyte salt is a bis(fluorosulfonyl)imide anion or bis(trifluoromethanesulfonyl)imide anion.
6. The member for electrochemical devices according to claim 1 , wherein a cation of the electrolyte salt is a 1-ethyl-3-methylimidazolium cation, a N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cation, or a N-methyl-N-propylpyrrolidinium cation.
7. The member for electrochemical devices according to claim 1 ,
wherein the electrode mixture layer is a negative electrode mixture layer, the electrode active material is a negative electrode active material, and the negative electrode active material is at least one selected from the group consisting of graphite, amorphous carbon, carbon black, metal oxides, metal lithium, metal sodium, metal calcium, and metal magnesium.
8. An electrochemical device comprising:
a pair of electrodes each having an electrode mixture layer; and
an electrolyte layer provided between the pair of electrodes;
wherein the electrode mixture layer comprises an electrode active material, a polymer having a structural unit represented by the following formula (1), at least one electrolyte salt selected from the group consisting of lithium salts, sodium salts, calcium salts, and magnesium salts, and a molten salt having a melting point of 250° C. or less, and
the electrolyte layer comprises an oxide-based inorganic solid electrolyte, and
wherein the electrode mixture layer contacts the electrolyte layer:
wherein X − represents a counter anion.
9. The electrochemical device according to claim 8 , wherein the oxide-based inorganic solid electrolyte is an oxide represented by the following formula (2):
Li 7−b La 3−a A 1 a Zr 2−b M 1 b O 12 (2)
wherein A 1 represents at least one metal element selected from the group consisting of Y, Nd, Sm, and Gd, and
wherein M 1 represents at least one metal element selected from the group consisting of Nb and Ta, 0≤a<3, and 0≤b<2.
10. The electrochemical device according to claim 8 , wherein the oxide-based inorganic solid electrolyte is an oxide represented by the following formula (3):
Li 1+c+d Al c (Ti,Ge) 2−c Si d P 3−d O 12 (3)
wherein 0≤c<2 and 0≤d<3.
11. The electrochemical device according to claim 8 , wherein a content of the polymer in the electrode mixture layer is 10 to 30% by mass based on a total amount of the polymer, the electrolyte salt, and the molten salt.
12. The electrochemical device according to claim 8 , wherein an anion of the electrolyte salt is a bis(fluorosulfonyl)imide anion or a bis(trifluoromethanesulfonyl)imide anion.
13. The electrochemical device according to claim 8 , wherein a cation of the electrolyte salt is a 1-ethyl-3-methylimidazolium cation, a N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cation, or a N-methyl-N-propylpyrrolidinium cation.
14. The electrochemical device according to claim 8 , wherein the pair of electrodes is a positive electrode having a positive electrode mixture layer comprising a positive electrode active material and a negative electrode having a negative electrode mixture layer comprising a negative electrode active material, and
wherein the negative electrode active material is at least one selected from the group consisting of graphite, amorphous carbon, carbon black, metal oxides, metal lithium, metal sodium, metal calcium, and metal magnesium.