Lithium-ion battery with anode comprising blend of intercalation-type anode material and conversion-type anode material

Patent metadata

Field	Value
Publication number	US-2021313617-A1
Application number	US-202117222017-A
Country	US
Kind code	A1
Filing date	Apr 5, 2021
Priority date	Apr 3, 2020
Publication date	Oct 7, 2021
Grant date	—

Abstract

An aspect is directed to a Li-ion battery, comprising anode and cathode electrode, an electrolyte ionically coupling the anode and the cathode electrodes, and a separator electrically separating the anode and the cathode electrodes, wherein the anode electrode comprises a mixture of conversion-type anode material and intercalation-type anode material, wherein the conversion-type anode material exhibits median specific reversible capacity in the range from about 1400 mAh/g to about 2200 mAh/g, and wherein the conversion-type anode material exhibits first cycle coulombic efficiency in the range from about 88% to about 96%.

First claim

1 . A Li-ion battery, comprising:
anode and cathode electrodes; an electrolyte ionically coupling the anode and the cathode electrodes; and a separator electrically separating the anode and the cathode electrodes; wherein the anode electrode comprises a mixture of conversion-type anode material and intercalation-type anode material, wherein the conversion-type anode material exhibits median specific reversible capacity in the range from about 1400 mAh/g to about 2200 mAh/g, and wherein the conversion-type anode material exhibits first cycle coulombic efficiency in the range from about 88% to about 96%.

2 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises from about 40 wt. % to about 60 wt. % Si.

3 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises a core-shell nanocomposite particle.

4 . The Li-ion battery of claim 3 , wherein an average thickness of an outer shell in the core-shell nanocomposite particle ranges from about 1 nm to about 20 nm.

5 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises one or more internal pores inaccessible to the electrolyte.

6 . The Li-ion battery of claim 5 , wherein a volume of the one or more internal pores ranges from about 0.1 to about 1 cm 3 /g.

7 . The Li-ion battery of claim 5 , wherein an average size of the one or more internal pores ranges from about 1 nm to about 50 nm.

8 . The Li-ion battery of claim 1 , wherein the conversion-type anode material exhibits density in the range from about 1 to about 2 g/cm 3 .

9 . The Li-ion battery of claim 1 , wherein the conversion-type anode material exhibits specific surface area in the range from about 1 to about 25 m 2 /g.

10 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises Si-comprising nanoparticles having volume-averaged size in the range from about 2 nm to about 40 nm.

11 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises less than about 2 wt. % oxygen (O).

12 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises less than about 0.5 wt. % hydrogen (H).

13 . The Li-ion battery of claim 1 , wherein the conversion-type anode material comprises from about 6 wt. % to about 60 wt. % carbon (C).

14 . The Li-ion battery of claim 13 ,
wherein the conversion-type anode material exhibits a core-shell structure, wherein a shell of the core-shell structure comprises sp 2 -bonded carbon.

15 . The Li-ion battery of claim 13 , wherein a ratio of intensities of Raman D-band to Raman G-band (I D /I G ) is in the range from about 0.7 to about 2 when recorded on the conversion-type anode material while arranged as a powder using a Raman spectrometer equipped with a laser operating at a wavelength of around 532 nm.

16 . The Li-ion battery of claim 1 , wherein the anode electrode, excluding any current collector foil component, exhibits a gravimetric capacity in the range from about 400 mAh/g to about 1200 mAh/g.

17 . The Li-ion battery of claim 1 , wherein the anode electrode, the cathode electrode, or both, exhibits reversible areal capacity in the range from about 3 to about 4.5 mAh/cm 2 or from about 4.5 to about 8 mAh/cm 2 .

18 . The Li-ion battery of claim 1 , wherein the anode electrode comprises soft carbon, hard carbon, synthetic graphite, natural graphite.

19 . The Li-ion battery of claim 1 , wherein the anode electrode, excluding any current collector foil component, exhibit a density in the range from about 1.2 g/cm 3 to about 1.8 g/cm 3 .

20 . The Li-ion battery of claim 1 , wherein the anode electrode comprises a polymer or co-polymer binder.

21 . The Li-ion battery of claim 20 , wherein the anode electrode, excluding any current collector foil component, comprises from about 2 wt. % to about 7 wt. % of the polymer or co-polymer binder.

22 . The Li-ion battery of claim 20 , wherein the polymer or co-polymer binder comprises alginic acid and their various salts, polyacrylic acid (PAA) or its salts, carboxymethyl cellulose (CMC), alginic acid of its salts, styrene-butadiene rubber (SBR), or a combination thereof.

23 . The Li-ion battery of claim 1 , wherein the cathode electrode comprises intercalation-type cathode material that includes Ni, Co, Mn, Fe, or a combination thereof.

24 . The Li-ion battery of claim 1 , wherein the electrolyte comprises both one or more esters and one or more cyclic carbonates.

25 . The Li-ion battery of claim 24 , wherein a volume fraction of the one or more esters ranges from about 20 vol. % to about 90 vol. % as a fraction of all solvents in the electrolyte.

26 . The Li-ion battery of claim 24 , wherein the one or more esters comprise one or more branched esters, and wherein the one or more branched esters comprise ester molecules that have on average between around 5 and around 7 carbon (C) atoms per molecule.

Assignees

• Sila Nanotechnologies Inc

Inventors

• Yushin Gleb
• Kajdos Adam
• Lulevich Valentin
• Ingle Nicholas
• Turcheniuk Kostiantyn

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/366

  as layered products · CPC title