Electrode materials with mixed particle sizes
First Claim
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1. A solid state electrode of an electrochemical device comprising:
- a first plurality of particles of electrochemically active material, the first plurality of particles having a first particle size distribution characterized by a first dispersity of 0.25 or less and a first median diameter; and
a second plurality of particles of ion conductive material, the second plurality of particles having a second particle size distribution characterized by a second dispersity of 0.25 or less and a second median diameter, the second median diameter being at least three times smaller than the first median diameter;
wherein the electrode is characterized by a porosity of less than 10% by volume.
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Abstract
The present invention is directed to electrochemical devices and materials thereof. More specifically, embodiments set forth herein provide a low-porosity electrode that includes large particles and small particles. The large particles include electrochemically active material. The small particles include ion conductive electrolyte materials. In some examples, the large particles and small particles are characterized by a dispersity of no higher than 0.5. There are other embodiments as well.
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Citations
22 Claims
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1. A solid state electrode of an electrochemical device comprising:
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a first plurality of particles of electrochemically active material, the first plurality of particles having a first particle size distribution characterized by a first dispersity of 0.25 or less and a first median diameter; and a second plurality of particles of ion conductive material, the second plurality of particles having a second particle size distribution characterized by a second dispersity of 0.25 or less and a second median diameter, the second median diameter being at least three times smaller than the first median diameter; wherein the electrode is characterized by a porosity of less than 10% by volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A solid state electrochemical electrode comprising:
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active materials characterized by a first particle size distribution having a first median particle size; catholyte materials characterized by a second particle size distribution having a second median particle size; wherein the volumetric ratio of active materials to catholyte materials is from 99;
1 to 1;
1; andwherein the particle size ratio of the first median particle size to the second median particle size is at least 3;
1 or greater; andwherein the electrochemical electrode has a porosity of less than 10% by volume. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An electrochemical cell comprising
an anode current collector; -
an anode in direct contact with the anode current collector; an electrolyte in direct contact with the anode, the anode being positioned between the anode current collector and the electrolyte, and the electrolyte being characterized by an ionic conductivity of at least 1 e-4 S/cm; and a solid state positive electrode in direct contact with the electrolyte and comprising; active materials characterized by a first particle size distribution having a first median particle size; catholyte materials characterized by a second particle size distribution having a second median particle size; wherein the volumetric ratio of active materials to catholyte materials is from 99;
1 to 1;
1; andwherein the particle size ratio of the first median particle size to the second median particle size is at least 3;
1 or greater; andwherein the positive electrode has a porosity of less than 10% by volume. - View Dependent Claims (19, 20, 21, 22)
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Specification