Alkali-ion conductive separator assembly for rechargeable electrochemical cells

Patent metadata

Field	Value
Publication number	US-2016141580-A1
Application number	US-201414899899-A
Country	US
Kind code	A1
Filing date	May 27, 2014
Priority date	Jun 19, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

Disclosed is an alkali-ion conducting separator assembly comprising a porous membrane (A) and an alkali-ion conducting film (B) placed on one major surface of the porous membrane (A), wherein the alkali-ion conducting film (B) comprises an inorganic material of the general formula (I): (L 1+ [(12−u)2+wv)−xm−[(3−y)3+yn]−[(2−z)5+zp] I m+ x ](A 3+ 3−y a n+ y )(B 5+ 2−z b p+ z )(O 2− 12−u D v− w ) (I) Further disclosed is a process for producing such an alkali-ion conducting separator assembly and a rechargeable electrochemical cell comprising such an alkali-ion conducting separator assembly.

First claim

1 . An alkali-ion conducting separator assembly comprising:
a porous membrane comprising at least one inorganic, electrically insulating and non-alkali-ion conducting material, the porous membrane comprising through pores that extend from one major surface of the porous membrane to an opposing major surface, and an alkali-ion conducting film placed on one major surface of the porous membrane; wherein: the through pores of the porous membrane are sealed by the alkali-ion conducting film, and the alkali-ion conducting film comprises an inorganic material of the formula (I):
(L 1+ [(12−u)2+wv]−xm−[(3−y)3+yn]−[(2−z)5+zp] I m+ x )(A 3+ 3−y a n+ y )(B 5+ 2−z b p+ z )(O 2− 12−u D v− w )  (I)

in which:
L is an alkali metal,
I is Mg, Al or Ga,
A is a lanthanide,
a is an alkali metal, alkaline earth metal or a lanthanide,
B is Nb or Ta,
b is Nb, Ta, Zr, Hf, Ce, Y, W, Mo, Sb, Te, Bi, Sn, Ti or Pr,
D is F (fluorine), S (sulfur), N (nitrogen) or C (carbon),
m is 2 for Mg or 3 for Al or Ga,
n is 1 for alkali metal, 2 for alkaline earth metal or 2, 3 or 4 for lanthanide,
p is 2, 3, 4, 5 or 6 depending on the oxidation state of metal b,
is 1 for F (fluorine), 2 for S (sulfur), 3 for N (nitrogen) or 4 for C (carbon),
w is in the range from 0 to 12,
u is in the range from 0 to 12,
x is in the range from 0 to 0.75,
y is in the range from 0 to 3, and
z is in the range from 0 to 2.

2 . The alkali-ion conducting separator assembly according to claim 1 , wherein the inorganic, electrically insulating and non-alkali-ion conducting material of the porous membrane is selected from the group consisting of a ceramic, a sintered ceramic, a glass ceramic and a glass.

3 . The alkali-ion conducting separator assembly according to claim 1 , wherein the porous membrane has an average thickness of 5 μm to 500 μm.

4 . The alkali-ion conducting separator assembly according to claim 1 , wherein the alkali-ion conducting film has an average thickness of 0.01 μm to 40 μm.

5 . The alkali-ion conducting separator assembly according to claim 1 , wherein the alkali-ion conducting separator assembly is impermeable to organic solvents.

6 . A process for producing an alkali-ion conducting separator assembly according to claim 1 , comprising:
depositing a layer of a material, which is alkali-ion conducting or which becomes alkali-ion conducting after thermal or chemical treatment, on one major surface of the porous membrane; and optionally calcinating the porous membrane comprising the deposited layer at 100° C. to 1500° C.

7 . A rechargeable electrochemical cell comprising:
at least one cathode, at least one anode, at least one electrolyte composition comprising:
at least one aprotic organic solvent, and
at least one alkali metal salt, and
at least one alkali-ion conducting separator assembly according to claim 1 .

8 . The rechargeable electrochemical cell according to claim 7 , wherein the at least one cathode (a) comprises an electroactive chalcogen-containing material.

9 . The rechargeable electrochemical cell according to claim 7 , wherein the at least one anode comprises an alkali metal.

10 . The rechargeable electrochemical cell according to claim 7 , wherein the aprotic organic solvent is selected from the group consisting of a polymer, a cyclic ether, a noncyclic ether, a cyclic acetal, a noncyclic acetal, a cyclic organic carbonate and a noncyclic organic carbonate.

11 . The rechargeable electrochemical cell according to claim 7 , wherein the alkali metal salt is a lithium salt or sodium salt.

12 . The rechargeable electrochemical cell according to claim 7 , wherein the porous membrane is filled with the electrolyte composition.

13 . An alkali metal ion battery comprising at least one rechargeable electrochemical cell according to claim 7 .

14 . A device comprising at least one rechargeable electrochemical cell according to claim 7 .

Assignees

• Basf Se

Inventors

• Sommer Heino
• Reinacher Jochen
• Janek Juergen
• Berendts Stefan

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/434

  Ceramics · CPC title

• H01M50/437

  Glass · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M2/1646

  Electricity · mapped topic