Electroactive materials for metal-ion batteries
AssigneeNexeon Limited
InventorsCharles Mason, Richard Taylor, James Farrell, William Macklin
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Abstract
This invention relates to particulate electroactive materials comprising a plurality of composite particles, wherein the composite particles comprise: (a) a porous carbon framework including micropores and optional mesopores having a total volume of at least 0.7 cm3/g and up to 2 cm3/g, wherein at least half of the total micropore and mesopore volume is in the form of pores having a diameter of no more than 1.5 nm; and (b) silicon located within the micropores and optional mesopores of the porous carbon framework in a defined amount relative to the total volume of the micropores and optional mesopores.
Claims23
A particulate material comprising a plurality of composite particles, wherein the composite particles comprise:
- (a) a porous carbon framework comprising micropores and mesopores,
- wherein the micropores and mesopores have a total pore volume as measured by gas adsorption of P1 cm3/g, wherein P1 has a value of at least 0.75 and up to 1.5, and
- wherein the PD50 pore diameter as measured by gas adsorption is no more than 1.5 nm;
- and
- (b) a plurality of elemental nanoscale silicon domains located at least within the micropores of the porous carbon framework;
- wherein the volume of silicon in the composite particles is equal to 20-55% of the micropore and mesopore volume, and
- wherein at least 90 wt % of the silicon mass in the composite particles is located within the internal pore volume of the porous carbon framework.
A rechargeable metal-ion battery comprising:
- (i) an anode, wherein the anode comprises an electrode as described in 22;
- (ii) a cathode comprising a cathode active material capable of releasing and reabsorbing metal ions;
- and
- (iii) an electrolyte between the anode and the cathode.
Dependencies are inferred from the claim text.