Anode materials for lithium ion batteries and methods of making and using same
An electrochemically active material includes, prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material. The electrochemically active material has a lithium consumption rate between 0.05% and 0.2%.
1. An electrochemically active material, the material comprising:
prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material; and
prior to incorporation of active lithium, an irreversible capacity of less than 15%;
wherein the electrochemically active material has a lithium consumption rate between 0.02% and 0.2%; and
wherein the electrochemically active material comprises Si.
2. The electrochemically active material of claim 1 , wherein the electrochemically active material comprises Mg, Ca, Sr, Ag, Zn, B, C, Al, Sn, Pb, Sb, or Bi, or combinations thereof.
3. The electrochemically active material according to claim 1 , wherein the electrochemically active material comprises an electrochemically active phase comprising Mg, Ca, Sr, Ag, Zn, B, C, Al, Si, Sn, Pb, Sb, or Bi, or combinations thereof.
4. The electrochemically active material according to claim 3 , wherein the active phase is between 30 vol. % and 70 vol. % of the electrochemically active material, based on the total volume of the active material.
5. The electrochemically active material according to claim 3 , wherein the active phase is between 40 vol. % and 60 vol. % of the electrochemically active material, based on the total volume of the active material.
6. The electrochemically active material according to claim 3 , wherein the active phase is between 40 vol. % and 55 vol. % of the electrochemically active material, based on the total volume of the active material.
7. The electrochemically active material according to claim 3 , wherein the active phase is between 48 vol. % and 52 vol. % of the electrochemically active material, based on the total volume of the active material.
8. The electrochemically active material according to claim 3 , wherein the active phase comprises one or more grains, and wherein the grain size of the grains of the active phase is no greater than 15 nanometers.
9. The electrochemically active material according to claim 1 , wherein the electrochemically active material comprises reversible lithium corresponding to at least 10% of the reversible capacity of the electrochemically active material.
10. The electrochemically active material according to claim 1 , wherein the electrochemically active material comprises reversible lithium corresponding to less than 40% of the reversible capacity of the electrochemically active material.
11. The electrochemically active material according to claim 1 , wherein the electrochemically active material has a lithium consumption rate of greater than 0.05%.
12. The electrochemically active material according to claim 1 , wherein the electrochemically active material has a lithium consumption rate of greater than 0.10%.
13. The electrochemically active material according to claim 1 , wherein the electrochemically active material comprises an alloy having the formula: Si x M y C z , where x, y, and z represent atomic % values and a) x>2y+z; (b) x, y and z are greater than 0; and (c) M is at least iron and optionally one or more metals selected from manganese, molybdenum, niobium, tungsten, tantalum, copper, titanium, vanadium, chromium, nickel, cobalt, zirconium, yttrium, or combinations thereof.
14. An electrode composition comprising:
the electrochemically active material according to claim 1 ; and
a binder.
15. An electrode composition according to claim 14 , further comprising carbon nanotubes.
16. An electrode composition according to claim 15 , wherein the carbon nanotubes are present in the electrode composition in an amount of between 0.2 wt. % and 20 wt. %, based on the total weight of the electrode composition.
17. An electrode composition according to claim 14 , further comprising graphite.
18. A negative electrode comprising:
the electrode composition according to claim 14 ; and
a current collector.
19. An electrochemical cell comprising:
the negative electrode of claim 18 ;
a positive electrode comprising a positive electrode composition comprising lithium; and
an electrolyte comprising lithium;
wherein the electrochemical cell has not undergone an initial charge/discharge cycle.
20. An electronic device comprising the electrochemical cell according to claim 19 .