Electrolytes and electrochemical devices
AssigneeBoard of Regents, The University of Texas System
InventorsArumugam Manthiram, Wangda Li
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Abstract
Disclosed herein are electrolytes and electrochemical devices. The electrochemical devices comprise cathodes that include nickel-rich layered lithium transition metal oxides, lithium-rich layered transition-metal oxides, lithium manganese-based spinel oxides, lithium polyanion-based compounds, and combinations thereof. The electrolytes include a lithium imide salt, an aprotic acyclic carbonate solvent, and an additive, wherein the additive comprises a metal salt, an aprotic solvent, or a combination thereof. The electrolyte can be stable at a voltage of 4.3 V or above vs. Li/Li+.
Claims27
A lithium metal oxide cathode comprising:
- LiS1Ni1−S2−S3CoS2MS3Os4
- wherein
- 1≤S1≤1.1;
- 0≤S2≤0.04;
- 0.01<S3<0.3;
- 2≤S4≤2.2;
- 0.7<1−S2−S3<1;
- and
- M is selected from the group consisting of Mn, Al, Mg, Fe, Cr, B, Ti, Zr, Ga, Zn, V, Cu, Li, Na, K, F, Ca, Y, Nb, Mo, Ru, Rh, Ta, W, Ir, In, Tl, Sn, S, P, Cl, Sb, Te, Ce, and combinations thereof and M comprises at least Mn and Al,
- wherein the lithium metal oxide cathode is configured to exhibit a specific discharge capacity in an electrochemical cell of from 180 mA h g−1 to 350 mA h g−1 at a current density of 180 mA g−1.
An electrochemical cell comprising:
- an anode;
- a non-aqueous liquid electrolyte in electrochemical contact with the anode;
- and
- a lithium metal oxide cathode in electrochemical contact with the non-aqueous liquid electrolyte, wherein the lithium metal oxide cathode comprises LiS1Ni1−S2−S3CoS2MS3Os4, wherein
- 1≤S1≤1.1;
- 0≤S2≤0.04;
- 0.01<S3<0.3;
- 2≤S4≤2.2;
- 0.7<1−S2−S3<1;
- and
- M is selected from the group consisting of Mn, Al, Mg, Fe, Cr, B, Ti, Zr, Ga, Zn, V, Cu, Li, Na, K, F, Ca, Y, Nb, Mo, Ru, Rh, Ta, W, Ir, In, Tl, Sn, S, P, Cl, Sb, Te, Ce, and combinations thereof and M comprises at least Mn and Al, and
- wherein the lithium metal oxide cathode exhibits a specific discharge capacity of from 180 mA h g−1 to 350 mA h g−1 at a current density of 180 mA g−1.
Dependencies are inferred from the claim text.