High-discharge-rate lithium ion battery
View Patent ↗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.
1. A lithium ion battery comprising:
a) A first mixture comprising a carbon conductor, a binder, NMP, and a lithium oxide active material, a second mixture comprising the carbon conductor, the binder, NMP, and a graphite active material, wherein the weight ratio of carbon conductor to binder of the first mixture and the second mixture are less than 0.6 to 1;
b) a cathode conductive material coated by the first mixture;
c) an anode conductive material coated by the second 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.
2. The lithium ion battery of claim 1 , wherein the carbon conductor is selected from the group consisting of one or more of the following: acetylene black, carbon fibers, single wall carbon nanotubes, and multiwall carbon nanotubes.
3. The lithium ion battery of claim 1 , wherein the binder is selected from the group consisting of one or more of the following: PVDF, PTFE, and latex.
4. The lithium ion battery of claim 1 wherein the cathode conductive material comprises aluminum.
5. The lithium ion battery of claim 1 , wherein the anode conductive material comprises copper.
6. The lithium ion battery of claim 1 , wherein the cathode and anode conductive material are in the form of a foil or sheet.