Electrodes for metal-ion batteries
First Claim
1. An electrode for a metal-ion battery, the electrode comprising an active layer in electrical contact with a current collector, wherein the active layer comprises:
- (i) a plurality of porous particles comprising at least 60 wt % of an electroactive material selected from the group consisting of silicon, germanium, tin, aluminium and mixtures thereof, wherein the plurality of porous particles has a D50 particle diameter in a range of from 0.5 to 18 μ
m, and an intra-particle porosity in a range of from 30 to 90%; and
(ii) a plurality of carbon particles selected from the group consisting of graphite, soft carbon, hard carbon and mixtures thereof, wherein the plurality of carbon particles has a D50 particle diameter in a range of from 1 to 50 μ
m,wherein the plurality of carbon particles (ii) makes up at least 50% by weight of the active layer, and wherein a ratio of the D50 particle diameter of the plurality of carbon particles (ii) to the D50 particle diameter of the plurality of porous particles (i) is in a range of from 1.5 to 30.
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Accused Products
Abstract
An electrode for a metal-ion battery is provided wherein the active layer of the electrode comprises a plurality of porous particles comprising an electroactive material selected from silicon, germanium, tin, aluminium and mixtures thereof and a plurality of carbon particles selected from one or more of graphite, soft carbon and hard carbon. The ratio of the D50 particles size of the carbon particles to the D50 particle diameter of the porous particles is in the range of from 1.5 to 30. Also provided are rechargeable metal-ion batteries comprising said electrode and compositions of porous particles and carbon particles which may be used to prepare the active layer of said electrode.
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Citations
28 Claims
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1. An electrode for a metal-ion battery, the electrode comprising an active layer in electrical contact with a current collector, wherein the active layer comprises:
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(i) a plurality of porous particles comprising at least 60 wt % of an electroactive material selected from the group consisting of silicon, germanium, tin, aluminium and mixtures thereof, wherein the plurality of porous particles has a D50 particle diameter in a range of from 0.5 to 18 μ
m, and an intra-particle porosity in a range of from 30 to 90%; and(ii) a plurality of carbon particles selected from the group consisting of graphite, soft carbon, hard carbon and mixtures thereof, wherein the plurality of carbon particles has a D50 particle diameter in a range of from 1 to 50 μ
m,wherein the plurality of carbon particles (ii) makes up at least 50% by weight of the active layer, and wherein a ratio of the D50 particle diameter of the plurality of carbon particles (ii) to the D50 particle diameter of the plurality of porous particles (i) is in a range of from 1.5 to 30. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 27)
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22. An electrode composition comprising:
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(i) a plurality of porous particles comprising at least 60 wt % of an electroactive material selected from the group consisting of silicon, germanium, tin, aluminium and mixtures thereof, wherein the plurality of porous particles has a D50 particle diameter in a range of 0.5 to 18 μ
m, and an intra-particle porosity in a range of from 30 to 90%; and(ii) a plurality of carbon particles selected from the group consisting of graphite, soft carbon, hard carbon and mixtures thereof, wherein the plurality of carbon particles has a D50 particle diameter in a range of from 1 to 50 μ
m,wherein the plurality of carbon particles makes up at least 50% by weight of the electrode composition, based on solids content of the electrode composition, and wherein a ratio of the D50 particle diameter of the plurality of carbon particles (ii) to the D50 particle diameter of the plurality of porous particles (i) is in a range of from 1.5 to 30. - View Dependent Claims (23, 24, 25, 28)
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26. A rechargeable metal-ion battery comprising:
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(i) an anode, wherein the anode comprises an electrode, wherein the electrode comprises an active layer in electrical contact with a current collector, wherein the active layer comprises; (a) a plurality of porous particles comprising at least 60 wt % of an electroactive material selected from the group consisting of silicon, germanium, tin, aluminium and mixtures thereof, wherein the plurality of porous particles has a D50 particle diameter in a range of from 0.5 to 18 μ
m, and an intra-particle porosity in a range of from 30 to 90%; and(b) a plurality of carbon particles selected from the group consisting of graphite, soft carbon, hard carbon and mixtures thereof, wherein the plurality of carbon particles has a D50 particle diameter in a range of from 1 to 50 μ
m,wherein the plurality of carbon particles (ii) makes up at least 50% by weigh of the active layer, and wherein a ratio of the D50 particle diameter of the plurality of carbon particles (ii) to the D50 particle diameter of the plurality of porous particles (i) is in a range of from 1.5 to 30; (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.
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Specification