Lithium/sulfur battery with increased capacity and associated processes

Patent metadata

Field	Value
Publication number	US-2021119210-A1
Application number	US-201917047595-A
Country	US
Kind code	A1
Filing date	Apr 19, 2019
Priority date	Apr 20, 2018
Publication date	Apr 22, 2021
Grant date	—

Abstract

A new class of alkoxyamines is described that exhibits improved stability on storage, especially in the presence of monomers and/or of a solvent, and particularly where the alkoxylamines are a new class of oligomeric alkoxyamines, which are obtained by addition of one or more monomeric entities to an alkoxyamine.

First claim

1 . A battery comprising an anode, a separator, a cathode comprising a composite material based on sulfur and carbon-based material, and a catholyte, wherein the catholyte includes at least one organosulfur species participating in the capacity of the cathode.

2 . The battery as claimed in claim 1 , wherein the anode comprises an anode active material comprising sodium or lithium.

3 . The battery as claimed in claim 1 , wherein the composite material has been formed in a melt, via a step of melting the sulfur and of blending the sulfur and the carbon-based material.

4 . The battery as claimed in claim 1 , wherein the carbon-based material is selected from: carbon black, carbon nanotubes, carbon fibers, graphene, acetylene black, graphite, carbon nanofibers and a mixture thereof in all proportions.

5 . The battery as claimed in claim 1 , wherein the composite material comprises sulfur in elemental form.

6 . The battery as claimed in claim 1 , wherein the composite material also includes selenium.

7 . The battery as claimed in claim 1 , wherein the at least one organosulfur species is selected from: an organic disulfide, an organic polysulfide, a thiol, a polythiol, a thiolate or a polythiolate.

8 . The battery as claimed in claim 1 , wherein the at least one organosulfur species is selected from the compounds having the following formulae: RS x R, R(SH) n , R(SM) x , R(COSH) n , R(COSM) n , RCOS x R and a polymer including one or more functions from among —S x —, —COS x —, —SH, —SM, —COSH and —COSM,
with:
M selected from Li and Na;
R selected from substituted or unsubstituted alkyl or aryl groups,
x an integer greater than or equal to 2,
n an integer greater than or equal to 1.

9 . The battery as claimed claim 1 , wherein the catholyte also comprises:
one or more alkali metal salts, mineral and organic polysulfide salts of A z S x and RS x A, or mixtures thereof, with: R selected from substituted or unsubstituted alkyl or aryl groups, A selected from Li, Na, K, Rb and Cs, x an integer greater than or equal to 2, and z an integer greater than or equal to 2.

10 . The battery as claimed in claim 1 , wherein the catholyte also comprises one or more lithium salts and Li polysulfides:
with: y an integer greater than or equal to 2, and R selected from substituted or unsubstituted alkyl or aryl groups.

11 . The battery as claimed in claim 1 , wherein the catholyte may also comprise a polymeric binder.

12 . The battery as claimed in claim 1 , wherein the at least one organosulfur species is a polymer and is capable of behaving like a polymeric binder.

13 . The battery as claimed in claim 12 , wherein the at least one organosulfur species acting as a polymeric binder is selected from a polymer containing the following functions: disulfide —S—S—, polysulfides —S n — with n an integer greater than or equal to 2, and/or —SH.

14 . The battery as claimed in claim 1 , wherein the organosulfur species participating in the capacity of the cathode are present in the catholyte in a concentration of greater than or equal to 0.05 mol/L.

15 . The battery as claimed in claim 1 , including mineral sulfur and organic sulfur, where the mole ratio between the mineral sulfur and the organic sulfur is between 0.05 and 10.

16 . The battery as claimed in claim 1 , wherein the cathode has a theoretical specific capacity of greater than 1700 mAh/g.

17 . The battery as claimed in claim 1 , wherein the cathode has a specific capacity of greater than 1300 mAh/g measured at a discharging regime equal to C/10.

18 . The battery as claimed in claim 1 , wherein the cathode has a specific capacity of greater than 500 mAh/g measured at a discharging regime equal to C/1.

19 . The battery as claimed in claim 1 , wherein the cathode is capable of having a specific capacity of greater than 1000 mAh/g measured at a discharging regime equal to C/1 after 400 cycles.

20 . The battery as claimed in claim 1 , where the battery does not require a forming step.

21 . A process for manufacturing a battery as claimed in claim 1 , the process comprising:
a step of preparing a catholyte including at least one organosulfur species participating in the capacity of the cathode and a step of assembling an anode, a cathode, a separator and catholyte.

22 . The manufacturing process as claimed in claim 21 , wherein the process does not include a step of forming the battery after the assembly step.

Assignees

• Arkema France

Inventors

• Korzhenko Alexander
• Skowron Pierre-Thomas
• Schmitt Paul-Guillaume
• Anouti Meriem

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M4/583 Primary

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/60

  of organic compounds · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title