Low-cobalt and cobalt-free, high-energy cathode materials for lithium batteries
View Patent ↗Described herein are low or no-cobalt materials useful as electrode active materials in a cathode for lithium or lithium-ion batteries. For example, compositions of matter are described herein, such as electrode active materials that can be incorporated into an electrode, such as a cathode. The disclosed electrode active materials exhibit high specific energy and voltage, and can also exhibit high rate capability and/or long operational lifetime.
1. An electrode active material comprising:
Li a Ni 1-b-c Co b M c O d , wherein:
a is from 0.9 to 1.1,
b is from 0 to 0.03,
c is from 0 to 0.67,
d is from 1.9 to 2.1, and
M is Mn, Al, Mg, Fe, Cr, B, Ti, Zr, Ga, Zn, V, Cu, Yb, Li, Na, K, F, Ba, Ca, Lu, Y, Nb, Mo, Ru, Rh, Ta, Pr, W, Ir, In, Tl, Sn, Sr, S, P, Cl, Ge, Sb, Er, Te, La, Ce, Nd, Dy, Eu, Sc, Se, Si, Tc, Pd, Pm, Sm, Gd, Tb, Ho, Tm, or any combination of these, and wherein the electrode active material exhibits or is characterized by a dQ·dV −1 curve at the second charge-discharge formation cycle for a current rate of C/10 having a minimum during discharge at a voltage of from 4.19 V to 4.30 V vs. Li + /Li.
2. The electrode active material of claim 1 , wherein M comprises at least Al.
3. The electrode active material of claim 1 , wherein b is 0 or wherein b is less than 0.01.
4. The electrode active material of claim 1 , wherein a is from 0.9 to 1.
5. The electrode active material of claim 1 , wherein a is from 1 to 1.1.
6. The electrode active material of claim 1 , wherein b is from 0 to 0.01 and wherein c is from 0 to 0.01.
7. The electrode active material of claim 1 , wherein d is from 1.95 to 2.05.
8. The electrode active material of claim 1 , exhibiting or characterized by a tapped density of from 2.0 g·cm −3 to 3.5 g·cm −3 .
9. The electrode active material of claim 1 , exhibiting or characterized by a specific energy for a single discharge between 4.4 V and 3 V vs. Li + /Li of from 600 Wh·kg −1 to 1000 Wh·kg −1 .
10. The electrode active material of claim 1 , exhibiting or characterized by a specific energy for a single discharge between 4.4 V and 3 V vs. Li + /Li at a 1C discharge rate of from 600 Wh·kg −1 to 1000 Wh·kg −1 at 25° C.
11. The electrode active material of claim 1 , wherein the minimum is at a voltage of from 4.20 V to 4.30 V vs. Li + /Li.
12. The electrode active material of claim 1 , wherein the minimum has a magnitude of from −3000 mAh·g −1 V −1 to −300 mAh·g −1 V −1 .
13. The electrode active material of claim 1 , exhibiting or characterized by a specific energy after 500 charge-discharge cycles of more than 80% of an original specific energy of from 600 Wh·kg −1 to 1000 Wh·kg −1 .
14. The electrode active material of claim 1 , exhibiting or characterized by a specific energy after 1000 charge-discharge cycles of more than 80% of an original specific energy of from 600 Wh·kg −1 to 1000 Wh·kg −1 .
15. The electrode active material of claim 1 , wherein only a portion comprises or is characterized by a rhombohedral crystal structure or a rhombohedral R 3 m crystal structure.
16. The electrode active material of claim 1 , having or characterized by a surface region and a bulk region, wherein the surface region corresponds to a first portion of the active material or particles thereof within 20% of a cross-sectional dimension from a surface of the active material or particles thereof, and wherein the bulk region corresponds to a second portion of the active material or particles thereof deeper than the surface region.
17. The electrode active material of claim 16 , wherein the bulk region is free or substantially free of or does not exhibit a spinel, P4 3 32 or Fd 3 m crystal structure, a lithium-excess or C2/m crystal structure, a rock salt or Fm 3 m crystal structure, or LiFePO 4 (Pmnb/Pnma) or another polyanionic crystal structure.
18. The electrode active material of claim 16 , wherein at least a portion of the surface region comprises or is characterized by a spinel, P4 3 32 or Fd 3 m crystal structure, a lithium-excess or C2/m crystal structure, a rock salt or Fm 3 m crystal structure, or LiFePO 4 (Pmnb/Pnma) or another polyanionic crystal structure.
19. The electrode active material of claim 1 , comprising particles of Li a N 1-b-c Co b M c O d having cross-sectional dimensions of from 500 nm to 30 μm.
20. The electrode active material of claim 1 , comprising a plurality of particles, which are substantially monodisperse and substantially spherical in shape.
21. An electrode active material comprising:
Li a Ni 1-b-c Co b M c O d , wherein:
a is from 0.9 to 1.1,
b is from 0 to 0.03,
c is from 0 to 0.67,
d is from 1.9 to 2.1, and
M is Mn, Al, Mg, Fe, Cr, B, Ti, Zr, Ga, Zn, V, Cu, Yb, Li, Na, K, F, Ba, Ca, Lu, Y, Nb, Mo, Ru, Rh, Ta, Pr, W, Ir, In, Tl, Sn, Sr, S, P, Cl, Ge, Sb, Er, Te, La, Ce, Nd, Dy, Eu, Sc, Se, Si, Tc, Pd, Pm, Sm, Gd, Tb, Ho, Tm, or any combination of these; and
wherein the electrode active material exhibits or is characterized by a specific energy for a single discharge for a current rate of C/10 between 4.4 V and 3 V vs. Li + /Li of from 850 Wh·kg −1 to 1000 Wh·kg −1 at 25° C.
22. The electrode active material of claim 21 , wherein the electrode active material further exhibits or is further characterized by a specific energy for a 1C discharge rate between 4.4 V and 3 V vs. Li + /Li at 25° C. that is from 85% to 100% of the specific energy for a C/10 discharge rate between 4.4 V and 3 V vs. Li + /Li at 25° C.
23. The electrode active material of claim 21 , wherein the electrode active material further exhibits or is further characterized by a specific energy for a 1C discharge rate between 4.4 V and 3 V vs. Li + /Li at 25° C. that is from 90% to 100% of the specific energy for a C/10 discharge rate between 4.4 V and 3 V vs. Li + /Li at 25° C.
24. The electrode active material of claim 21 , exhibiting a dQ·dV −1 curve at the second charge-discharge formation cycle, for a current rate of C/10, which has a minimum with a magnitude of from −3000 mAh·g −1 V −1 to −300 mAh·g −1 V −1 during discharge at a voltage of from 4.15 V to 4.30 V vs. Li + /Li.
25. An electrode comprising the electrode active material of claim 1 .
26. An electrochemical cell, comprising:
a cathode, the cathode comprising the electrode of claim 25 ;
an anode; and
an electrolyte between the cathode and the anode.
27. The electrochemical cell of claim 26 , wherein the anode comprises graphite, carbon, silicon, lithium titanate (Li 4 Ti 5 O 12 ), tin, antimony, zinc, phosphorous, lithium, or a combination thereof.
28. The electrochemical cell of claim 26 , wherein the electrolyte is a liquid electrolyte, a semi-solid electrolyte, or a solid electrolyte.
29. The electrode active material of claim 21 , wherein M comprises at least Al.