Electrochemical cells comprising fibril materials

Patent metadata

Field	Value
Publication number	US-2017047590-A1
Application number	US-201615237876-A
Country	US
Kind code	A1
Filing date	Aug 16, 2016
Priority date	Mar 5, 2013
Publication date	Feb 16, 2017
Grant date	—

Abstract

The use of fibril materials, such as fibril cellulose materials and other similar materials, in electrochemical cells and components thereof is generally described.

First claim

What is claimed is:

1 - 25 . (canceled)

26 . An electrochemical cell, comprising:
a negative electrode; a positive electrode; and an electrolyte in electrochemical communication with the negative electrode and the positive electrode, wherein the electrolyte comprises a plurality of fibrils comprising cellulose or a cellulose derivative having maximum cross-sectional diameters of less than about 1 micrometer and aspect ratios of at least about 10:1.

27 . (canceled)

28 . The electrochemical cell of claim 26 , wherein the electrolyte comprises a solid material, and the fibrils are at least partially surrounded by the solid material.

29 . The electrochemical cell of claim 26 , wherein the electrolyte is a gel electrolyte.

30 . The electrochemical cell of claim 26 wherein the electrolyte is a solid polymer electrolyte.

31 - 37 . (canceled)

38 . An electrode, comprising:
a layer comprising an electrochemically active material; a protective layer over the layer comprising the electrochemically active material; and a fibril-containing layer over the protective layer and the layer comprising the electrochemically active material, wherein: at least a portion of the fibrils within the fibril-containing layer are electronically non-conductive and/or polymeric, and at least a portion of the fibrils within the fibril-containing layer have maximum cross-sectional diameters of less than about 1 micrometer and aspect ratios of at least about 10:1.

39 . The electrode of claim 38 , wherein the electrode is a negative electrode.

40 . The electrode of claim 38 , wherein the electrochemically active material comprises lithium.

41 . The electrode of claim 40 , wherein the electrochemically active material comprises lithium metal and/or a lithium metal alloy.

42 . The electrode of claim 38 , wherein the protective layer is part of a multi-layer protective structure.

43 . The electrode of claim 38 , wherein the protective layer is an ion conducting layer.

44 . The electrode of claim 38 , wherein the fibril-containing layer comprises a matrix material having fibrils dispersed therein.

45 . The electrode of claim 44 , wherein the matrix material comprises a polymeric material.

46 . The electrode of claim 44 , wherein the matrix material comprises a ceramic material.

47 . The electrode of claim 38 , wherein the fibrils comprise a polymer.

48 . The electrode of claim 38 , wherein the fibrils comprise a polysaccharide.

49 . The electrode of claim 38 , wherein the fibrils comprise glucose.

50 . The electrode of claim 38 , wherein the fibrils comprise cellulose or a cellulose derivative.

51 . The electrode of claim 38 , wherein the fibrils have a bulk electronic resistivity of at least about 10 6 ohm-m at 20° C.

52 . The electrode of claim 38 , wherein the fibrils have an aspect ratio of at least about 100:1.

53 . A method, comprising:
positioning a fibril-containing layer adjacent a protective layer, wherein the protective layer is located over a layer comprising an electrochemically active material.

Assignees

• Sion Power Corp

Inventors

• Mikhaylik Yuriy V
• Coleman David L

Classifications

• H01M4/622

  being polymers · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/08

  Processes of manufacture · CPC title