Lmfp-lfp core-shell cathode material

Patent metadata

Field	Value
Publication number	US-2026038812-A1
Application number	US-202418791368-A
Country	US
Kind code	A1
Filing date	Jul 31, 2024
Priority date	Jul 31, 2024
Publication date	Feb 5, 2026
Grant date	—

Abstract

An electrode is provided. The electrode includes an electrode material comprising a plurality of electrode active material particles. Each of the plurality of electrode active material particles includes a core, a first coating layer formed on a first surface of the core, a shell formed on a second surface of the first coating layer, and a second coating layer formed on a third surface of the shell. The core is formed of a lithium manganese iron phosphate material having the formula LiMnyFe1-yPO4, where 0<y<1. The first coating layer includes first carbon nanofibers. The shell includes LiFePO4. The second coating layer includes second carbon nanofibers.

First claim

What is claimed is:

1 . An electrode comprising:
an electrode material comprising a plurality of electrode active material particles, each of the plurality of electrode active material particles comprising: a core formed of a lithium manganese iron phosphate material having the formula LiMn y Fe 1-y PO 4 , where 0<y<1; a first coating layer formed on a first surface of the core, the first coating layer comprising first carbon nanofibers; a shell formed on a second surface of the first coating layer, the shell comprising LiFePO 4 ; and a second coating layer formed on a third surface of the shell, the second coating layer comprising second carbon nanofibers.

2 . The electrode according to claim 1 , wherein
the shell further comprises third carbon nanofibers.

3 . The electrode according to claim 1 , wherein
the core has a size of 5 μm to 10 μm.

4 . The electrode according to claim 1 , wherein
the electrode has a thickness of 150 μm to 500 μm.

5 . The electrode according to claim 1 , wherein
the electrode material further includes a binder in an amount of less than 2% by weight relative to a total weight of the electrode material.

6 . The electrode according to claim 1 , wherein
each of the plurality of electrode active material particles has a semi-circular shape in which curved branches extend from a central cylindrical portion.

7 . The electrode according to claim 1 , wherein
each of the first coating layer and the second coating layer has a thickness of 50 nm to 100 nm.

8 . The electrode according to claim 1 , wherein
the shell has a thickness of 0.5 μm to 1 μm.

9 . A battery comprising:
an anode comprising an anode material: a cathode comprising a cathode material; and a separator disposed between the anode and the cathode, the cathode material comprising a plurality of cathode active material particles, and each of the plurality of cathode active material particles comprising: a core formed of a lithium manganese iron phosphate material having the formula LiMn y Fe 1-y PO 4 , where 0<y<1; a first coating layer formed on a first surface of the core, the first coating layer comprising first carbon nanofibers; a shell formed on a second surface of the first coating layer, the shell comprising LiFePO 4 ; and a second coating layer formed on a third surface of the shell, the second coating layer comprising second carbon nanofibers.

10 . The battery according to claim 9 , wherein
the core has a size of 5 μm to 10 μm.

11 . The battery according to claim 9 , wherein
the cathode has a thickness of 150 μm to 500 μm.

12 . The battery according to claim 9 , wherein
the cathode material further includes a binder in an amount of less than 2% by weight relative to a total weight of the cathode material.

13 . The battery according to claim 9 , wherein
each of the plurality of cathode active material particles has a semi-circular shape in which curved branches extend from a central cylindrical portion.

14 . The battery according to claim 9 , wherein
each of the first coating layer and the second coating layer has a thickness of 50 nm to 100 nm.

15 . The battery according to claim 9 , wherein
the shell has a thickness of 0.5 μm to 1 μm.

16 . The battery according to claim 9 , wherein
the anode comprises an anode active material selected from the group consisting of: graphite, silicon, a silicon-graphite composite, lithium metal, lithium titanium oxide, graphene, a composite of silicon and graphene oxide, and a lithium metal alloy.

17 . The battery according to claim 9 , wherein
the anode has a thickness of 70 μm to 250 μm.

18 . The battery according to claim 9 , further comprising
a liquid electrolyte provided in the separator.

19 . The battery according to claim 9 , wherein
the separator is formed of at least one selected from the group consisting of: polyethylene and polypropylene.

20 . An electrode material comprising:
a plurality of electrode active material particles, each of the plurality of electrode active material particles comprising: a core formed of a lithium manganese iron phosphate material having the formula LiMn y Fe 1-y PO 4 , where 0<y<1; a first coating layer formed on a first surface of the core, the first coating layer comprising first carbon nanofibers; a shell formed on a second surface of the first coating layer, the shell comprising LiFePO 4 ; and a second coating layer formed on a third surface of the shell, the second coating layer comprising second carbon nanofibers.

Assignees

• Nissan North America Inc

Inventors

• Raman Santhanam
• Patil Sandeep
• Gumeci Cenk

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M10/052

  Li-accumulators · CPC title