Substituted imidazole and benzimidazole lithium salts

Patent metadata

Field	Value
Publication number	US-10734677-B2
Application number	US-201715698527-A
Country	US
Kind code	B2
Filing date	Sep 7, 2017
Priority date	Jun 26, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A new class of electrolyte salts that contain substituted imidazole or benzimidazole groups is described. The salts can be used in non-aqueous electrolytes in lithium or other alkali battery cells. When used with a lithium metal anode, the salts are electrochemically stable up to 5V vs. Li/Li + .

First claim

We claim:

1. A composition comprising:

wherein each Z is selected independently from the group consisting of cyano, perfluoropolyether, and C x F 2x+1 groups, wherein x is an integer that ranges from 0 to 10 and wherein at least one Z is a perfluoropolyether; and
M is an alkali metal.

2. The composition of claim 1 further comprising:
a material selected from the group consisting of one or more of polyethers, polyesters, polyalkoxysiloxanes, polyamines, polyimides, polyamides, poly alkyl carbonates, polynitriles, perfluoro polyethers, fluorocarbon polymers substituted with nitriles, fluorocarbon polymers substituted with carbonates, fluorocarbon polymers substituted with sulfones, polysiloxanes, polyphosphazines, polyolefins, polydienes, and alkyl carbonates;
wherein the composition is an electrolyte.

3. A positive electrode, comprising:
positive electrode active material particles;
electronically-conductive particles; and
a matrix of a solid electrolyte material embedding the positive electrode active material particles and the electronically-conductive particles;
wherein the solid electrolyte material has a composition:

wherein each Z is selected independently from the group consisting of cyano, perfluoropolyether, and C x F 2x+1 groups, wherein x is an integer that ranges from 0 to 10 and wherein at least one Z is a perfluoropolyether; and
wherein M is an alkali metal.

4. The positive electrode of claim 3 wherein the solid electrolyte material comprises lithium.

5. The positive electrode of claim 3 wherein the positive electrode further comprises a binder.

6. The positive electrode of claim 3 wherein the positive electrode comprises either lithium nickel cobalt aluminum oxide or lithium nickel cobalt manganese oxide, and the solid electrolyte material comprises lithium.

7. A battery cell, comprising:
a positive electrode comprising positive electrode active material particles, electronically-conductive particles, and a matrix of a first solid electrolyte embedding the positive electrode active material particles and the electronically-conductive particles;
a negative electrode comprising lithium metal or lithium alloy; and
a separator region between the positive electrode and the negative electrode, the separator region comprising a second electrolyte, the second electrolyte providing ionic communication between the positive electrode and the negative electrode;
wherein at least one of the first solid electrolyte and the second electrolyte has a composition:

wherein each Z is selected independently from the group consisting of cyano, perfluoropolyether, and C x F 2x+1 groups, wherein x is an integer that ranges from 0 to 10 and wherein at least one Z is a perfluoropolyether; and
wherein M is an alkali metal.

8. The battery cell of claim 7 wherein the positive electrode comprises either lithium nickel cobalt aluminum oxide or lithium nickel cobalt manganese oxide, and the alkali metal is lithium.

9. The battery cell of claim 7 wherein the first solid electrolyte and the second electrolyte are the same.

10. The battery cell of claim 7 wherein the positive electrode further comprises a binder.

Assignees

• Bosch Gmbh Robert

Inventors

• Yang Jin
• Eitouni Hany Basam
• Azagarsamy Malar
• Kozinsky Boris
• Samsonidze Georgy
• Molinari Nicola

Classifications

• H01M50/40

  Separators; Membranes; Diaphragms; Spacing elements inside cells · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C07D233/90

  Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals · CPC title

• C07D235/10

  Radicals substituted by halogen atoms or nitro radicals · CPC title