Cathode material for lithium sulphur cells

Patent metadata

Field	Value
Publication number	US-2017207448-A1
Application number	US-201515315764-A
Country	US
Kind code	A1
Filing date	Jun 5, 2015
Priority date	Jun 6, 2014
Publication date	Jul 20, 2017
Grant date	—

Abstract

A cathode material for an electrochemical cell, in particular a lithium-sulfur cell, including at least one cathode active material and at least one in particular lithium ion-conducting or lithium ion-conductive polymer electrolyte and/or at least one inorganic ion conductor, in particular a lithium ion conductor. The at least one cathode active material includes a polymer containing in particular covalently bound sulfur. Moreover, also described is a cell and a battery equipped with same.

First claim

1 - 20 . (canceled)

21 . A cathode material for an alkali metal-sulfur cell or a lithium-sulfur cell, comprising:
at least one cathode active material; and at least one lithium ion-conducting or lithium ion-conductive polymer electrolyte and/or at least one inorganic ion conductor, in particular a lithium ion conductor; wherein the at least one cathode active material includes a polymer containing covalently bound sulfur.

22 . The cathode material of claim 21 , wherein the polymer containing covalently bound sulfur is homogeneously blended and/or mixed at the molecular level with the at least one polymer electrolyte and/or the at least one inorganic ion conductor.

23 . The cathode material of claim 21 , wherein the cathode material includes particles which include the polymer containing covalently bound sulfur, and the at least one polymer electrolyte and/or the at least one inorganic ion conductor, wherein the polymer containing covalently bound sulfur, and the at least one polymer electrolyte and/or the at least one inorganic ion conductor are present in the particles uniformly distributed.

24 . The cathode material of claim 21 , wherein the polymer containing in particular covalently bound sulfur, and the at least one polymer electrolyte and/or the at least one inorganic ion conductor form ion-conductive or ion-conducting channels and/or planes.

25 . The cathode material of claim 24 , wherein the ion-conductive or ion-conducting channels and/or planes extend continuously through the particles and/or up to the outer surface of the particles.

26 . The cathode material of claim 24 , wherein the channels extend along the polymer backbone of the polymer containing in particular covalently bound sulfur and/or of the at least one polymer electrolyte.

27 . The cathode material of claim 21 , wherein the ion-conductive or ion-conducting channels and/or planes are formed by polar areas of the polymer containing in particular covalently bound sulfur, and polar areas of the at least one polymer electrolyte.

28 . The cathode material of claim 27 , wherein alkali metal ions, in particular lithium ions, are coordinated with and/or bound to a negatively charged group Q − and/or an uncharged group Q in the polar areas of the at least one polymer electrolyte, the negatively charged group Q − and/or the uncharged group Q being bound to a polymer backbone-forming unit, in particular -[A]-, of the at least one polymer electrolyte.

29 . The cathode material of claim 21 , wherein the polymer backbones of the polymer containing in particular covalently bound sulfur, and the polymer backbones of the at least one polymer electrolyte form a structural plane.

30 . The cathode material of claim 27 , wherein ion-conductive or ion-conducting lamellar domains are formed by the polar areas of the polymer containing in particular covalently bound sulfur, and the polar areas of the at least one polymer electrolyte, the polymer backbones of the polymer containing in particular covalently bound sulfur, and the polymer backbones, in particular the polymer backbone-forming unit -[A]-, of the at least one polymer electrolyte forming a structural lamellar domain.

31 . The cathode material of claim 30 , wherein the ion-conductive or ion-conducting lamellar domains are formed between structural lamellar domains, in particular the ion-conductive or ion-conducting lamellar domains and the structural lamellar domains being situated in alternation.

32 . The cathode material of claim 21 , wherein the polymer containing covalently bound sulfur is prepared by sulfidation of a polymer, in particular polyacrylonitrile.

33 . The cathode material of claim 21 , wherein the at least one polymer electrolyte includes at least one repeating unit of the general chemical formula:

where -[A]- stands for a polymer backbone-forming unit,

X stands for a spacer, x stands for the number of spacers X and is 1 or 0, and
Q stands for a negatively charged group Q − and a counterion Z + , in particular a lithium ion, or
Q stands for an uncharged group, or
Q stands for a positively charged group Q + and a counterion Z − .

34 . The cathode material of claim 33 , wherein Q − stands for a group based on a lithium conducting salt anion or a group based on an anion of an ionic liquid, or a sulfonate group or a sulfate group or a carboxylate group or a group based on a phosphoric acid-based anion or a group based on an anion of an imide or a group based on an anion of an amide or a group based on an anion of a carboxylic acid amide, in particular a sulfonylimide group or a sulfonate group, and Z + stands for an alkali ion, in particular a lithium ion, or
Q stands for an uncharged group Q, in particular for an alkylene oxide group or an acyclic carbonate group or a cyclic carbonate group or a lactone group or a cyclic carbamate group or an acyclic carboxylic acid ester group or an acyclic carbamate group or hydrogen or an alkyl group, or
Q + stands for a pyridinium group or an ammonium group or an imidazolium group or a piperidinium group or a pyrrolidinium group or a phosphonium group or a guanidinium group or a morpholinium group or a uronium group or a thiouronium group, and Z − stands for an anion, in particular a lithium conducting salt anion, and/or
the polymer backbone-forming unit -[A]- includes an alkylene oxide unit and/or a unit which includes a carbonate group, and/or a siloxane unit and/or a phosphazene unit and/or a methyl methacrylate unit and/or a methacrylate unit and/or a phenylene unit and/or a phenylene oxide unit and/or a benzylene unit and/or an alkylene unit, and/or
the spacer X includes
at least one alkylene oxide group, in particular oligoalkylene oxide group, and/or
at least one, optionally additional, negatively charged group Q − , in particular at least one sulfonylimide group and/or at least one sulfonate group, and a counterion Z + , in particular a lithium ion, and/or
at least one carbonyl group, in particular at least one cyclic carbonate group and/or at least one lactone group and/or at least one cyclic carbamate group and/or at least one acyclic carbonate group and/or at least one acyclic carboxylic acid ester group and/or at least one acyclic carbamate group, in particular at least one acyclic carbonate group, and/or
at least one, optionally additional, positively charged group Q + , in particular based on a cation of an ionic liquid, in particular at least one ammonium ion group and/or at least one pyridinium group and/or at least one imidazolium group and/or at least one piperidinium group and/or at least one pyrrolidinium group and/or at least one phosphonium group and/or at least one guanidinium group and/or at least one morpholinium group and/or at least one uronium group and/or at least one thiouronium group and a counterion Z − , in particular a lithium conducting salt anion.

35 . The cathode material of claim 33 , wherein Q stands for a negatively charged group Q − and a counterion Z + , in particular a lithium ion.

36 . The cathode material of claim 21 , wherein the at least one inorganic ion conductor includes or is a sulfidic ion conductor, in particular a lithium argyrodite and/or a sulfidic glass, and/or an ion conductor having a garnet-like structure, in particular a lithium titanate, and/or an ion conductor of the LISICON type and/or the NASICON type and/or lithium phosphorus oxynitride.

37 . The cathode material of claim 21 , wherei

Assignees

• Bosch Gmbh Robert

Inventors

• Fanous Jean
• Schumann Bernd
• Thielen Joerg

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/362

  Composites · CPC title

• H01M4/622

  being polymers · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/137

  Electrodes based on electro-active polymers · CPC title