Electrical conductive polymer binder for Si alloy materials
A Poly(1-pyrenemethyl methacrylate-co-dopamine methacrylamide) PPyDMA polymer binder has been designed and fabricated, and has demonstrated an excellent performance for silicon (Si), graphite and a metal alloy anode materials. The PPyDMA polymer binder demonstrates the great potential of a catechol moiety for use in a lithium-ion battery.
1. A polymeric composition with repeating units of the formula comprising:
wherein n+m=1, and n>than 0 and m>than 0.
2. A composition of matter comprising:
an active electrode material selected from the group comprising silicon (Si), or tin (Sn), or Sn in inactive matrix (aluminum Al and iron Fe); and
a polymer binder, wherein the polymer binder comprises a polymeric composition having repeating units of the formula:
wherein n+m=1, and n>than 0 and m>than 0.
3. The composition of matter of claim 2 wherein the composition is deposited onto a copper foil.
4. The composition of matter of claim 3 wherein the composition is deposited onto the copper foil to form a film laminate.
5. The composition of matter of claim 4 wherein an exposed side of said film laminate includes a carbonate stabilizer.
6. The composition of matter of claim 5 wherein the carbonate stabilizer is ethylene carbonate or fluoroethylene carbonate.
7. The composition of matter of claim 5 wherein said carbonate stabilizer is an alkylene carbonate or alkyl carbonate.
8. The composition of matter of claim 5 wherein said carbonate stabilizer is a vinylene carbonate.
9. An electrode for use in a lithium-ion battery including the composition of matter of claim 2 .
10. A lithium ion battery having a negative electrode, wherein said negative electrode comprises a laminate of the composition of matter of claim 2 in combination with a current collector.
11. The lithium ion battery of claim 10 wherein the laminate comprises a copper foil current collector in electrical contact with a covering layer of the composition of matter of claim 2 .
12. A method of forming the laminate of claim 11 wherein Si, or Sn, or Sn in inactive matrix (Al and Fe) is combined with the polymer binder, the two components mixed in an organic solvent to form a slurry, the slurry then deposited onto the copper foil current collector followed by drying.
13. The method of claim 12 wherein, after formation, the exposed surface of the laminate is brought into contact with an alkylene carbonate or alkyl carbonate or ethylene carbonate or fluoroethylene carbonate to further stabilize the exposed surface.
14. The method of claim 13 wherein the carbonate is added to the electrolyte of the lithium ion battery to bring it into contact with the exposed surface of the laminate.