Battery electrode composition comprising carbon and silicon with specific properties for superior performance

Patent metadata

Field	Value
Publication number	US-11791455-B2
Application number	US-202318153800-A
Country	US
Kind code	B2
Filing date	Jan 12, 2023
Priority date	Sep 7, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

In an aspect, a lithium-ion battery anode composition comprises a porous composite particle comprising carbon (C) and an active material comprising silicon (Si), wherein the carbon is characterized by a domain size (r), as estimated from an atomic pair distribution function G(r) obtained from a synchrotron x-ray diffraction measurement of the porous composite particle, ranging from around 10 Å (1 nm) to around 60 Å (6 nm). In a further aspect, a carbon material for use in making an anode composition for use in a Li-ion battery is characterized by a domain size (r), as estimated from an atomic pair distribution function G(r) obtained from a synchrotron x-ray diffraction measurement of the carbon material, ranging from around 10 Å (1 nm) to around 60 Å (6 nm).

First claim

The invention claimed is:

1. A lithium-ion battery anode composition, comprising:
a porous composite particle comprising carbon (C) and an active material comprising silicon (Si),
wherein the carbon is characterized by a domain size (r), as estimated from an atomic pair distribution function G(r) obtained from a synchrotron x-ray diffraction measurement of the porous composite particle, ranging from around 10 Å (1 nm) to around 60 Å (6 nm).

2. The lithium-ion battery anode composition of claim 1 ,
wherein the carbon is characterized by one or more of the following: (1) a domain size ranging between around 15 Å and around 19 Å, (2) a domain size ranging between around 19 Å and around 22 Å, (3) a domain size ranging between around 24 Å and around 28 Å, and (4) a domain size ranging between around 28 Å and 55 Å, and
wherein the domain sizes are as estimated from the atomic pair distribution function G(r).

3. The lithium-ion battery anode composition of claim 1 , wherein the carbon comprises porous carbon.

4. The lithium-ion battery anode composition of claim 1 ,
wherein G(r=r 1 ) is a value of the atomic pair distribution function at a real space position of a first coordination sphere of the carbon,
wherein G(r=r 2 ) is a value of the atomic pair distribution function at a real space position of a second coordination sphere of the carbon, and
wherein a ratio G(r=r 1 )/G(r=r 2 ) is in a range of around 0.700 to around 0.590.

5. The lithium-ion battery anode composition of claim 1 ,
wherein W(r=r 1 ) is a value of a full width at half maximum of the atomic pair distribution function at a real space position of a first coordination sphere of the carbon,
wherein W(r=r 2 ) is a value of a full width at half maximum of the atomic pair distribution function at a real space position of a second coordination sphere of the carbon; and
wherein a ratio W(r=r 1 )/W(r=r 2 ) is in a range of around 0.700 to around 0.850.

6. The lithium-ion battery anode composition of claim 1 ,
wherein G(r=r 1 ) is a value of the atomic pair distribution function at a real space position of a first coordination sphere of the carbon,
wherein G(r=r 3 ) is a value of the atomic pair distribution function at a real space position of a third coordination sphere of the carbon, and
wherein a ratio G(r=r 1 )/G(r=r 3 ) is in a range of around 1.100 to around 1.300.

7. The lithium-ion battery anode composition of claim 1 ,
wherein W(r=r 1 ) is a value of a full width at half maximum of the atomic pair distribution function at a real space position of a first coordination sphere of the carbon,
wherein W(r=r 3 ) is a value of a full width at half maximum of the atomic pair distribution function at a real space position of a third coordination sphere of the carbon, and
wherein a ratio W(r=r 1 )/W(r=r 3 ) is in a range of around 0.600 to around 0.850.

8. The lithium-ion battery anode composition of claim 1 , wherein an anode comprising the anode composition exhibits an areal capacity loading that ranges from around 2 mAh/cm 2 to around 16 mAh/cm 2 .

9. The lithium-ion battery anode composition of claim 8 , wherein from around 10% to around 100% of the areal capacity loading of the anode is provided by composite particles that are each configured as the porous composite particle.

10. The lithium-ion battery anode composition of claim 8 , wherein the composite particles on average exhibit a silicon (Si) to carbon (C) weight ratio in the range from around 5:1 to 1:5.

11. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle is characterized by an average scattering domain size (r), as estimated from the atomic pair distribution function G(r), ranging from around 1 nm to around 40 nm.

12. The lithium-ion battery anode composition of claim 11 , wherein the porous composite particle is characterized by the average scattering domain size (r) ranging from around 1 nm to around 10 nm.

13. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle on average comprises less than about 1 wt. % hydrogen (H), less than about 5 wt. % nitrogen (N) and less than about 2 wt. % oxygen (O).

14. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle on average exhibits uptake from around 1.5 wt. % to around 25 wt. % nitrogen (N), derived from nitrogen gas (N 2 ), when heated in the nitrogen gas (n 2 ) at 1050° C. for a period of 2 hours, as measured on a powder that comprises the porous composite particle.

15. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle exhibits average uptake from around 0.5 wt. % to around 10 wt. % nitrogen (N), derived from nitrogen gas (N 2 ), when heated in the nitrogen gas (N 2 ) at 850° C. for a period of 2 hours, as measured on a powder that comprises the porous composite particle.

16. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle forms from around 1 wt. % to around 100 wt. % silicon carbide (SiC) when heated in a nitrogen gas (N 2 ) or in an argon gas (Ar) in a temperature range from around 750° C. to around 950° C. for a period of 2 hours or more, as detected by X-ray diffraction (XRD) or Fourier Transform Infrared Spectroscopy (FTIR).

17. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle exhibits an average Brunauer-Emmett-Teller (BET) specific surface area in the range from around 1 to around 40 m 2 /g, as measured using nitrogen sorption isotherm on a powder that comprises the porous composite particle.

18. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle exhibits average density in the range from around 0.9 g/cm 3 to around 2.2 g/cm 3 , as measured using nitrogen or argon pycnometry on a powder that comprises the porous composite particle.

19. The lithium-ion battery anode composition of claim 1 , wherein the porous composite particle exhibits volume-average particle size in the range from around 0.2 micron to around 20 microns, as measured using scanning electron microscope (SEM) image analysis or particle scattering techniques on a powder that comprises the porous composite particle.

20. The lithium-ion battery anode composition of claim 1 , wherein Raman spectra of the porous composite particle exhibits carbon D and G peaks, wherein a ratio of average intensities of the D to G peaks (I D /I G ) ranges from around 0.7 to around 2.7.

21. A Li-ion battery comprising:
an anode comprising the lithium-ion battery anode composition of claim 1 ;
a cathode that is electrically separated from the anode; and
an electrolyte ionically coupling the anode and the cathode.

22. The Li-ion battery of claim 21 ,
wherein R(r=r Si—C ) is a value of a radial distribution function R(r) at a real space position of a first coordination sphere of a Si—C pair in the porous composite particle,
wherein R(r=r C—C ) is a value of the radial distribution function R(r) at a real space position of a first coordination sphere of a C—C pair in the porous composite particle,
wherein the radial distribution function R(r) and the atomic pair distribution function are related by
R(r)=G(r)r+4πr 2 ρ 0 , ρ 0 being a constant relating to a number density of scatterers, and
wherein a ratio R(r=r Si—C )/R(r=r C—C ) is in a range of 0.050 to around 1.000.

23. A carbon material for use in making an anode composition f

Assignees

• Sila Nanotechnologies Inc

Inventors

• Yushin Gleb
• Clark Matthew
• Kajdos Adam
• Milakovich Timothy
• Sivaram Saujan
• Lulevich Valentin

Classifications

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2004/021

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

• H01M2004/027

  Negative electrodes · CPC title