Protection of battery electrodes against side reactions

Patent metadata

Field	Value
Publication number	US-2017098823-A1
Application number	US-201615286480-A
Country	US
Kind code	A1
Filing date	Oct 5, 2016
Priority date	Oct 5, 2015
Publication date	Apr 6, 2017
Grant date	—

Abstract

A battery electrode composition is provided that comprises composite particles. Each of the composite particles in the composition (which may represent all or a portion of a larger composition) may comprise a porous electrode particle and a filler material. The porous electrode particle may comprise active material provided to store and release ions during battery operation. The filler material may occupy at least a portion of the pores of the electrode particle. The filler material may be liquid and not substantially conductive with respect to electron transport.

First claim

1 . A battery electrode composition comprising composite particles, each composite particle comprising:
a porous electrode particle that comprises active material provided to store and release ions during battery operation; and a filler material occupying at least a portion of the pores of the electrode particle, wherein the filler material is liquid and is not substantially conductive with respect to electron transport.

2 . The battery electrode composition of claim 1 , wherein the filler material has an electrical conductivity less than 10 −6 S/cm.

3 . The battery electrode composition of claim 1 , wherein the active material is an alloying-type anode material.

4 . The battery electrode composition of claim 3 , wherein the alloying-type anode material comprises silicon, tin, antimony, phosphorous, or aluminum.

5 . The battery electrode composition of claim 1 , wherein the active material is a conversion-type cathode material.

6 . The battery electrode composition of claim 5 , wherein the conversion-type cathode material comprises a metal-fluoride-based material or a metal-sulfide-based material.

7 . The battery electrode composition of claim 1 , wherein, for at least a portion of the porous electrode particles, the active material is porous.

8 . The battery electrode composition of claim 1 , wherein, for at least a portion of the porous electrode particles, the active material is non-porous and the porous electrode particle is a composite particle further comprising a porous substrate.

9 . The battery electrode composition of claim 1 , wherein the filler comprises one or more oils.

10 . The battery electrode composition of claim 9 , wherein the one or more oils comprise one or more chemically-modified oils.

11 . The battery electrode composition of claim 1 , wherein the filler comprises one or more monomers or one or more reactive oligomers.

12 . The battery electrode composition of claim 1 , wherein each composite particle further comprises a second filler material that is solid.

13 . The battery electrode composition of claim 1 , wherein the filler comprises a first filler material having a first average molecular weight and a second filler material having a second average molecular weight different from the first average molecular weight.

14 . The battery electrode composition of claim 1 , wherein each composite particle has an outer region and an inner region, the outer region having pores with a first average pore size and the inner region having pores with a second average pore size larger than the first average pore size.

15 . The battery electrode composition of claim 14 , wherein the first average pore size is less than about 1 nm and the second average pore size is greater than about 3 nm.

16 . The battery electrode composition of claim 1 , wherein each composite particle has an outer region and an inner region, the inner region comprises the filler material and the outer region does not comprise the filler material.

17 . The battery electrode composition of claim 1 , wherein a volume fraction of the filler material in each composite particle changes from the center to the perimeter of the particle.

18 . A battery, comprising:
anode and cathode electrodes, wherein at least one of the electrodes comprises the battery electrode composition of claim 1 ; an electrolyte ionically coupling the anode and the cathode electrodes; and a separator electrically separating the anode and the cathode electrodes.

19 . A method of fabricating a battery electrode composition comprising composite particles, the method comprising:
forming porous electrode particles that each comprise active material provided to store and release ions during battery operation; and infiltrating, into the porous electrode particles, a filler material occupying at least a portion of the pores of each electrode particle, wherein the filler material is liquid and is not substantially conductive with respect to electron transport.

Assignees

• Sila Nanotechnologies Inc

Inventors

• Yushin Gleb
• Zdyrko Bogdan
• Berdichevsky Eugene
• Jacobs Alexander
• Nese Alper
• Kajdos Adam
• Yen Justin
• Doane Justin

Classifications

• H01M4/387

  Tin or alloys based on tin · CPC title

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/5815

  Sulfides · CPC title

• H01M4/463

  Aluminium based · CPC title

• H01M4/364 Primary

  as mixtures · CPC title