High-discharge-rate lithium ion battery
AssigneeThe Regents of the University of California
InventorsGao Liu, Vincent S. Battaglia, Honghe Zheng
Life of this patent
Estimating the term…
Abstract
The present invention provides for a lithium ion battery and process for creating such, comprising higher binder to carbon conductor ratios than presently used in the industry. The battery is characterized by much lower interfacial resistances at the anode and cathode as a result of initially mixing a carbon conductor with a binder, then with the active material. Further improvements in cycleability can also be realized by first mixing the carbon conductor with the active material first and then adding the binder.
Claims27
A lithium ion battery comprising:
- a) a mixture comprising a carbon conductor, a binder, NMP, and an active material, wherein the weight ratio of carbon conductor to binder is between less than 1:1 to 0.15:1;
- b) a cathode conductive material coated by the mixture;
- c) an anode conductive material coated by the mixture;
- d) an electrolyte;
- and
- e) a cell housing;
- wherein the cathode, anode and electrolyte are assembled into the cell housing with a porous separator disposed between the cathode and anode.
An electrode useful for a lithium ion battery comprising:
- a) a mixture comprising a carbon conductor, a binder, NMP, and an active material, wherein the mixture has a weight ratio of carbon conductor to binder of less than 1 to 1;
- and,
- b) an electrode conductive material coated by the mixture.
A method of fabricating electrodes useful for lithium ion batteries, comprising:
- a) providing as four separate components, a carbon conductor, NMP, a binder, and an active material;
- b) combining the carbon conductor, NMP, and as a third component either the binder or the active material, to create a mixture;
- c) combining the remaining, fourth component with the mixture and thoroughly mixing all components to form a slurry;
- d) coating a conductive electrode material with the slurry to form a laminate;
- e) drying the slurry on the conductive electrode material;
- and
- f) compressing the thus formed laminate at a process temperature.
Dependencies are inferred from the claim text.