Mixed binders

Patent metadata

Field	Value
Publication number	US-2018294482-A1
Application number	US-201715484501-A
Country	US
Kind code	A1
Filing date	Apr 11, 2017
Priority date	Apr 11, 2017
Publication date	Oct 11, 2018
Grant date	—

Abstract

A mixed binder which includes a polyacrylic acid and a polyimide. The mixed binder is configured to bind an anode and a current collector in an electrode. The mixed binder is also configured to come into contact with an electrolyte solution in the electrode.

First claim

What is claimed is:

1 . A mixed binder, comprising:
a polyacrylic acid; and a polyimide, wherein:
the mixed binder includes a pore structure with a pore size adjustable by calendering, the mixed binder is configured to bind a silicon monoxide anode and a current collector in an electrode of a cell that further includes a lithium cobalt oxide cathode, a level of adhesiveness binding the anode and the current collector being is based at least in part on the calendering, and the adhesiveness is inversely related to the pore size;
the mixed binder is configured to come into contact with an electrolyte solution in the electrode; the electrolyte solution includes a lithium-based electrolyte solution and includes one or more of the following: ethylene carbonate (EC), ethyl-methyl carbonates (EMC), dimethyl carbonate (DMC), or lithium hexafluorophosphate (LiPF 6 ); the mixed binder further includes carboxymethyl cellulose (CMC) and lithium hydroxide; and the mixed binder includes 10% polyimide and 5% polyacrylic acid by weight.

2 . (canceled)

3 . (canceled)

4 . The mixed binder recited in claim 1 , wherein the mixed binder is configured to be used in one or more of the following: a coin cell, a pouch cell, a cylindrical cell, or a prismatic cell with a wound configuration or a stacked configuration.

5 . A method, comprising:
applying heat at a first temperature to an electrode, wherein:
the electrode includes a mixed binder which in turn includes a polyacrylic acid (PAA) and a polyimide (PI);
the mixed binder binds a silicon monoxide anode and a current collector in the electrode;
the mixed binder comes into contact with an electrolyte solution in the electrode;
the electrolyte solution includes a lithium-based electrolyte solution and includes one or more of the following: ethylene carbonate (EC), ethyl-methyl carbonates (EMC), dimethyl carbonate (DMC), or lithium hexafluorophosphate (LiPF6);
the mixed binder further includes carboxymethyl cellulose (CMC) and lithium hydroxide; and
the mixed binder includes 10% polyimide and 5% polyacrylic acid by weight and
after applying heat at the first temperature, applying heat at a second temperature to the electrode, wherein the second temperature is hotter than the first temperature; and calendering the electrode by compressing the electrode to reduce a size of pores in the electrode and increase adhesion between the anode and the current collector.

6 . The method recited in claim 5 further comprising: after applying heat at the second temperature, applying heat at a third temperature to the electrode, wherein the third temperature is hotter than the second temperature.

7 . (canceled)

8 . A computer program product, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:
applying heat at a first temperature to an electrode, wherein:
the electrode includes a mixed binder which in turn includes a polyacrylic acid (PAA) and a polyimide (PI);
the mixed binder binds a silicon monoxide anode and a current collector in the electrode;
the mixed binder comes into contact with an electrolyte solution in the electrode;
the electrolyte solution includes a lithium-based electrolyte solution and includes one or more of the following: ethylene carbonate (EC), ethyl-methyl carbonates (EMC), dimethyl carbonate (DMC), or lithium hexafluorophosphate (LiPF6);
the mixed binder further includes carboxymethyl cellulose (CMC) and lithium hydroxide; and
the mixed binder includes 10% polyimide and 5% polyacrylic acid by weight and
after applying heat at the first temperature, applying heat at a second temperature to the electrode, wherein the second temperature is hotter than the first temperature; and calendering the electrode by compressing the electrode to reduce a size of pores in the electrode and increase adhesion between the anode and the current collector.

9 . The computer program product recited in claim 8 further comprising computer instructions for: after applying heat at the second temperature, applying heat at a third temperature to the electrode, wherein the third temperature is hotter than the second temperature.

10 . (canceled)

11 . (canceled)

12 . (canceled)

13 . (canceled)

14 . (canceled)

15 . (canceled)

16 . (canceled)

Assignees

• Kitty Hawk Corp

Inventors

• Li Chen
• Herring Patrick K

Classifications

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M2004/027

  Negative electrodes · CPC title