IP Library › Granted Patent US 12665192
Granted Patent B2
US 12665192 · App. 17/955,382 · Granted Jun 23, 2026

Intermetallic anode materials for lithium-ion batteries

Inventors: Soo Kim (Fremont, CA); Rubayyat Mahbub (Fremont, CA); Byoungchul You (Saratoga, CA); Cary Michael Hayner (Naperville, IL); Sookyung Jeong (San Jose, CA); Tae Kyoung Kim (Albany, CA); Ki Tae Park (Santa Clara, CA); Victor Prajapati (San Francisco, CA)
Assignee: Rivian IP Holdings, LLC
H01M4/405H01M4/131H01M4/133H01M4/134H01M4/362H01M4/366H01M4/381H01M4/386H01M4/463H01M4/466H01M4/583C01B33/00C01G5/006C01G15/006C01P2002/76C01P2002/77C01P2006/40H01M2004/027H01M4/46
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Quick Facts
Patent No.
US 12665192
App. No.
17/955,382
Granted
Jun 23, 2026
Kind
B2
Abstract

Particular embodiments may provide an anode material, comprising a compound of formula Li 2 —X—Y, wherein: X and Y are each independently a metal atom or a metalloid atom; the anode material has a discharge potential of less than about 0.4 V vs. Li/Li + ; and the molar ratio of Li:X:Y is 2:1:1.

Claims (24)

1 . A negative electrode comprising:

an anode material comprising a compound of formula Li 2 —X—Y; and

one or more additional materials selected from the group consisting of C, Si, SiC, and SiO x1 wherein x1 is less than or equal to 2;

wherein: X and Y are each independently a metal atom or a metalloid atom, and the anode material has a discharge potential of between 0 to about 0.4 V vs. Li/Li + , and the molar ratio of Li:X:Y is 2:1:1; and

wherein the anode material is coated with a layer of carbon.

2 . The negative electrode of claim 1 , wherein X is Ca, Mg, or Al.

3 . The negative electrode of claim 1 , wherein Y is Si, Ga, or Ag.

4 . The negative electrode of claim 1 , wherein X is Ca, Mg, or Al;

and Y is Si, Ga, or Ag.

5 . The negative electrode of claim 1 , wherein the compound is Li 2 CaSi, Li 2 MgGa, or Li 2 AlAg.

6 . The negative electrode of claim 1 , wherein X is Mg or Al.

7 . The negative electrode of claim 1 , wherein Y is Si or Ga.

8 . The negative electrode of claim 1 , wherein the compound is Li 2 MgSi, or Li 2 AlGa.

9 . The negative electrode of claim 1 , wherein the anode material has a discharge potential of between 0 to about 0.1 V vs. Li/Li + .

10 . The negative electrode of claim 1 , wherein the compound has a cubic unit cell.

11 . The negative electrode of claim 10 , wherein the cubic unit cell has an Fm3m or F43m space group.

12 . The negative electrode of claim 1 , wherein the energy above the convex hull (Ehull) of the compound is less than about 25 meV/atom.

13 . The negative electrode of claim 1 , wherein the compound has a bandgap (Eg) of less than about 1.2 eV.

14 . The negative electrode of claim 1 , wherein the anode material has a theoretical capacity of greater than about 372 mA h/g.

15 . The negative electrode of claim 1 , wherein the anode material does not comprise an over-lithiated form of the compound.

16 . The negative electrode of claim 1 , wherein the compound is susceptible to side decomposition reactions upon discharging.

17 . The negative electrode of claim 1 , wherein the one or more additional materials is Si.

18 . The negative electrode of claim 1 , wherein the one or more additional materials is SiC.

19 . The negative electrode of claim 1 , wherein the one or more additional materials is SiO x1 .