Electrodes, electrochemical cells, and methods of forming electrodes and electrochemical cells
Electrodes and methods of forming electrodes are described herein. The electrode can be an electrode of an electrochemical cell or battery. The electrode includes a current collector and a film in electrical communication with the current collector. The film may include a carbon phase that holds the film together. The electrode further includes an electrode attachment substance that adheres the film to the current collector.
1. A method of forming an electrode comprising:
providing a current collector;
providing a layer of electrode attachment substance on a first side of the current collector, wherein the layer of electrode attachment substance is in a substantially solid state;
subsequently placing a solid layer comprising electrochemically active material on the layer of electrode attachment substance such that the layer of electrode attachment substance is sandwiched between the current collector and the solid layer comprising electrochemically active material; and
adhering the electrochemically active material to the current collector, wherein portions of the solid layer comprising electrochemically active material penetrate the layer of electrode attachment substance and come in direct contact with the current collector.
2. The method of claim 1 , further comprising:
providing a second electrode attachment substance on a second side of the current collector, wherein the second electrode attachment substance is in a substantially solid state.
3. The method of claim 2 , further comprising:
placing a second solid layer comprising electrochemically active material on the second electrode attachment substance such that the second electrode attachment substance is sandwiched between the current collector and the second solid layer comprising electrochemically active material.
4. The method of claim 3 , further comprising:
adhering the electrochemically active material of the second solid layer to the current collector.
5. The method of claim 4 , wherein adhering the electrochemically active materials of both solid layers occur simultaneously.
6. The method of claim 1 , wherein the electrode attachment substance comprises a non-soluble polymer.
7. The method of claim 1 , wherein the electrode attachment substance comprises a thermoplastic polymer.
8. The method of claim 1 , wherein the electrode attachment substance comprises a polymer that is not soluble in a nonaqueous electrolyte solution.
9. The method of claim 8 , wherein the nonaqueous electrolyte solution comprises a carbonate solvent.
10. The method of claim 8 , wherein the polymer comprises polyamideimide, polyvinylidene fluoride, polyethylene, or polypropylene.
11. The method of claim 1 , wherein adhering comprises heat laminating.
12. The method of claim 1 , wherein adhering comprises roll pressing or flat pressing.
13. The method of claim 1 , wherein the solid layer comprises a self-supporting film.
14. The method of claim 1 , wherein the solid layer comprising electrochemically active material comprises a silicon-carbon composite material.
15. The method of claim 14 , wherein the silicon-carbon composite material comprises a silicon-carbon composite film.