Stabilization of li-ion battery anodes

Patent metadata

Field	Value
Publication number	US-10411290-B2
Application number	US-201715728458-A
Country	US
Kind code	B2
Filing date	Oct 9, 2017
Priority date	Feb 7, 2011
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Li-ion batteries are provided that include a cathode, an anode comprising active particles, an electrolyte ionically coupling the anode and the cathode, a separator electrically separating the anode and the cathode, and at least one hydrofluoric acid neutralizing agent incorporated into the anode or the separator. Li-ion batteries are also provided that include a cathode, an anode comprising active particles, an electrolyte ionically coupling the anode and the cathode, and a separator electrically separating the anode and the cathode, where the electrolyte may be formed from a mixture of an imide salt and at least one salt selected from the group consisting of LiPF6, LiBF4, and LiClO4. Li-ion battery anodes are also provided that include an active material core and a protective coating at least partially encasing the active material core, where the protective coating comprises a material that is resistant to hydrofluoric acid permeation.

First claim

The invention claimed is:

1. A Li-ion battery, comprising:
a cathode;
an anode comprising active particles that comprise at least one of silicon (Si), germanium (Ge), tin (Sn), titanium (Ti), aluminum (Al), or magnesium (Mg);
an electrolyte ionically coupling the anode and the cathode;
a separator electrically separating the anode and the cathode; and
at least one hydrofluoric acid neutralizing agent incorporated into the anode as part of a polymer coating on each of the active particles in the anode, and wherein the at least one hydrofluoric acid neutralizing agent comprises:
a hydrofluoric acid binding metal derivative salt comprising Ca, Mg, Ag, Cu, Fe, Ni, or Co,
a hydrofluoric acid binding metal derivative oxide comprising Ca or Cu, or
a Lewis base having a free pair of electrons.

2. The Li-ion battery of claim 1 , wherein the at least one hydrofluoric acid neutralizing agent comprises the hydrofluoric acid binding metal derivative salt.

3. The Li-ion battery of claim 1 , wherein the at least one hydrofluoric acid neutralizing agent comprises the hydrofluoric acid binding metal derivative oxide comprising Ca or Cu.

4. The Li-ion battery of claim 1 , wherein the at least one hydrofluoric acid neutralizing agent comprises the Lewis base having a free pair of electrons.

5. An anode composition, comprising:
active particles that comprise at least one of silicon (Si), germanium (Ge), tin (Sn), titanium (Ti), aluminum (Al), or magnesium (Mg), each of the active particles including a polymer coating that incorporates at least one hydrofluoric acid neutralizing agent, wherein the at least one hydrofluoric acid neutralizing agent comprises:
a hydrofluoric acid binding metal derivative salt comprising Ca, Mg, Ag, Cu, Fe, Ni, or Co,
a hydrofluoric acid binding metal derivative oxide comprising Ca or Cu, or
a Lewis base having a free pair of electrons.

6. The anode composition of claim 5 , wherein the at least one hydrofluoric acid neutralizing agent comprises the hydrofluoric acid binding metal derivative salt.

7. The anode composition of claim 5 , wherein the at least one hydrofluoric acid neutralizing agent comprises the hydrofluoric acid binding metal derivative oxide comprising Ca or Cu.

8. The anode composition of claim 5 , wherein the at least one hydrofluoric acid neutralizing agent comprises the Lewis base having a free pair of electrons.

Assignees

• Sila Nanotechnologies Inc
• Georgia Tech Res Inst

Inventors

• Yushin Gleb Nikolayevich
• Zdyrko Bogdan
• Evanoff Kara

Classifications

• H01M4/628

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

• H01M4/38

  of elements or alloys · CPC title

• H01M4/463

  Aluminium based · CPC title

• H01M4/387

  Tin or alloys based on tin · CPC title

• H01M10/0568

  characterised by the solutes · CPC title