Composition of SI/C electro active material
AssigneeNexeon Limited
InventorsMamdouh Elsayed Abdelsalam, Fazil Coowar
Life of this patent
Estimating the term…
Abstract
A composition comprising a first particulate electroactive material, a particulate graphite material and a binder, wherein at least 50% of the total volume of each said particulate materials is made up of particles having a particle size D50 and wherein a ratio of electroactive material D50 particle size:graphite D50 particle size is up to 4.5:1.
Claims36
A composition comprising a first particulate electroactive material, 0.5-6 wt % of a particulate graphite material and a binder, wherein 50% of the total volume of each of the first particulate electroactive material and the particulate graphite material is made up of particles having a measured spherical equivalent volume diameter equal to or less than a particle size D50 and wherein a ratio of D50 particle size of the first particulate electroactive material:D50 particle size of the particulate graphite material is at least 2:1 and no more than 4.5:1,
- wherein the first particulate electroactive material comprises silicon-comprising particles, and wherein the particulate graphite material comprises graphite flakes wherein (i) both a length and a width of the graphite flakes are each independently on average at least 5 times a thickness of the flakes, and/or (ii) the thickness of the flakes is less than 1 micron.
A metal-ion battery comprising an anode, a cathode, and an electrolyte between the anode and the cathode wherein the anode comprises a composition comprising:
- a first particulate electroactive material;
- 0.5-6 wt % of a particulate graphite material;
- and
- a binder,
- wherein 50% of the total volume of each of the first particulate electroactive material and the particulate graphite material is made up of particles having a measured spherical equivalent volume diameter equal to or less than a particle size D50 and wherein a ratio of D50 particle size of the first particulate electroactive material:D50 particle size of the particulate graphite material is at least 2:1 and no more than 4.5:1,
- wherein the first particulate electroactive material comprises silicon-comprising particles, and wherein the particulate graphite material comprises graphite flakes wherein (i) both a length and a width of the graphite flakes are each independently on average at least 5 times a thickness of the flakes, and/or (ii) the thickness of the flakes is less than 1 micron.
A method of forming a metal-ion battery, the metal ion battery comprising an anode, a cathode, and an electrolyte between the anode and the cathode, the method comprising steps of:
- forming an anode by depositing a slurry onto a conductive material, the slurry comprising a composition comprising:
- a first particulate electroactive material,
- 0.5-6 wt % of a particulate graphite material, and
- a binder,
- wherein 50% of the total volume of each of the first particulate electroactive material and the particulate graphite material is made up of particles having a measured spherical equivalent volume diameter equal to or less than a particle size D50 and wherein a ratio of D50 particle size of the first particulate electroactive material:D50 particle size of the particulate graphite material is at least 2:1 and no more than 4.5:1,
- wherein the first particulate electroactive material comprises silicon-comprising particles, and wherein the particulate graphite material comprises graphite flakes wherein (i) both a length and a width of the graphite flakes are each independently on average at least 5 times a thickness of the flakes, and/or (ii) the thickness of the flakes is less than 1 micron;
- and
- evaporating the at least one solvent.
Dependencies are inferred from the claim text.