Systems and Methods to Control Lithium Plating

Patent metadata

Field	Value
Publication number	US-2020220141-A1
Application number	US-201916243032-A
Country	US
Kind code	A1
Filing date	Jan 8, 2019
Priority date	Jan 8, 2019
Publication date	Jul 9, 2020
Grant date	—

Abstract

Various battery cell arrangements are presented herein. The battery cell can include an anode current collector. The battery cell can include a carbon-based anode coating layer that coats the anode current collector. A first bond between the anode current collector and the anode coating layer may have a first adhesion strength. The battery cell also includes a cathode, a separator layer that contacts the cathode, and a separator coating layer. The separator coating layer can be positioned between the anode coating layer and the separator layer. A second bond between the separator coating material and the anode coating material has a second adhesion strength. The second adhesion strength of the second bond may be greater than the first adhesion strength of the first bond.

First claim

1 . A battery cell, comprising:
an anode current collector; a carbon-based anode coating layer that coats the anode current collector, wherein a first bond between the anode current collector and the anode coating layer has a first adhesion strength; a cathode; a separator layer that contacts the cathode; a separator coating layer wherein the separator coating layer is positioned between the anode coating layer and the separator layer, wherein: a second bond between the separator coating layer and the anode coating layer has a second adhesion strength; and the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.

2 . The battery cell of claim 1 , wherein a peel test is used to determine that the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.

3 . The battery cell of claim 2 , wherein the peel test is a 180 degree peel test.

4 . The battery cell of claim 1 , wherein the separator coating layer comprises polyvinylidene fluoride (PVDF).

5 . The battery cell of claim 1 , wherein heat and pressure is applied to the battery cell to increase adhesion between the separator coating layer and the anode coating layer.

6 . The battery cell of claim 1 , further comprising an electrolyte solution that permeates the cathode, the separator layer, and the separator coating layer.

7 . The battery cell of claim 5 , further comprising lithium plating located between the anode current collector and the anode coating layer.

8 . The battery cell of claim 7 , wherein no lithium plating is present between the anode coating layer and the separator coating layer.

9 . A method of creating a battery cell, the method comprising:
coating an anode current collector with an anode coating layer; coating a separator with a separator coating layer; pressing the anode current collector toward the separator such that the anode coating layer is pressed against the separator coating layer; and applying heat while the anode current collector is being pressed against the separator such that the anode coating layer is pressed against the separator coating layer, wherein a first bond between the anode current collector and the anode coating layer has a first adhesion strength; a second bond between the separator coating layer and the anode coating layer having a second adhesion strength is present; and the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.

10 . The method of creating the battery cell of claim 9 , further comprising:
performing a peel test to determine that the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.

11 . The method of creating the battery cell of claim 10 , wherein the peel test is a 180 degree peel test.

12 . The method of creating the battery cell of claim 10 , wherein the separator comprises polyvinylidene fluoride (PVDF).

13 . The method of creating the battery cell of claim 10 , the method further comprising: adding an electrolyte solution that permeates a cathode of the battery cell, the separator, and the separator coating layer.

14 . The method of creating the battery cell of claim 10 , wherein lithium plating is located between the anode current collector and the anode coating layer.

15 . The method of creating the battery cell of claim 14 , wherein no lithium plating is present between the anode coating layer and the separator coating layer.

16 . The method of creating the battery cell of claim 9 , wherein coating the anode current collector comprises coating the anode current collector with a slurry of carbon black, SBR (styrene-butadiene rubber), CMC (carboxymethyl cellulose) and water.

17 . The method of creating the battery cell of claim 9 , wherein coating the separator with the separator coating layer comprises coating the separator with a PVdF slurry that comprises NMP (N-methylpyrrolidone).

18 . The method of creating the battery cell of claim 9 , wherein pressing the anode current collector toward the separator comprises applying a pressure between 50 and 200 N/cm 2 .

19 . The battery cell of claim 1 , further comprising: a liquid electrolyte that is soaked into the cathode, anode coating layer, separator layer, and separator coating layer of the battery cell.

20 . The battery cell of claim 5 , wherein the temperature of the applied heat is between 75 and 100 Celsius and the pressure applied is between 50-200 N/cm 2 .

Assignees

• Chongqing Jinkang New Energy Automobile Co Ltd
• Sf Motors Inc

Inventors

• Imoto Hiroshi
• Ogata Ken
• Arai Juichi
• Yang Yang

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title