CONFIGURING ANISOTROPIC EXPANSION OF SILICON-DOMINANT ANODES USING PARTICLE SIZE
Systems and methods for configuring anisotropic expansion of silicon-dominant anodes using particle size may include a cathode, an electrolyte, and an anode, where the anode may include a current collector and an active material on the current collector. An expansion of the anode during operation may be configured by utilizing a predetermined particle size distribution of silicon particles in the active material. The expansion of the anode may be greater for smaller particle size distributions, which may range from 1 to 10 μm. The expansion of the anode may be smaller for a rougher surface active material, which may be configured by utilizing larger particle size distributions that may range from 5 to 25 μm. The expansion may be configured to be more anisotropic using more rigid materials for the current collector, where a more rigid current collector may comprise nickel and a less rigid current collector may comprise copper.
1 . A battery, the battery comprising:
a cathode, an electrolyte, and an anode, the anode comprising:
a current collector; and
an active material on the current collector, wherein an expansion of the anode during operation is configured by utilizing a predetermined particle size distribution of silicon particles in the active material.
2 . The battery according to claim 1 , wherein the expansion of the anode is greater for silicon particles with smaller particle size distributions than for silicon with larger particle size distributions.
3 . The battery according to claim 2 , wherein smaller particle size distributions range from 1 to 10 μm.
4 . The battery according to claim 1 , wherein the expansion of the anode is smaller for a rougher surface active material.
5 . The battery according to claim 4 , wherein the rougher surface active material is configured by utilizing larger particle size distributions.
6 . The battery according to claim 5 , wherein the larger particle size distributions range from 5 to 25 μm.
7 . The battery according to claim 1 , wherein the expansion of the anode is less anisotropic if the active material is flat press laminated to the current collector.
8 . A method of forming a battery, the method comprising:
forming a battery comprising a cathode, an electrolyte, and an anode, the anode comprising a current collector and an active material on the current collector; and
configuring an expansion of the anode utilizing a predetermined particle size distribution of silicon particles in the active material.
9 . The method according to claim 8 , wherein the expansion of the anode is greater for smaller particle size distributions.
10 . The method according to claim 9 , wherein smaller particle size distributions range from 1 to 10 μm.
11 . The method according to claim 8 , wherein the expansion of the anode is smaller for a rougher surface active material.
12 . The method according to claim 11 , wherein the rougher surface of the active material is configured by utilizing larger particle size distributions.
13 . The method according to claim 12 , wherein the larger particle size distributions range from 5 to 25 μm.
14 . The method according to claim 8 , wherein the expansion of the anode is more anisotropic if the active material is roll press laminated to the current collector and is less anisotropic if the active material is flat press laminated to the current collector.
15 . A battery, the battery comprising:
a cathode, an electrolyte, and an anode, the anode comprising:
a current collector; and
an active material on the current collector, wherein a particle size distribution of silicon particles in the active material is in the range of 5 to 25 μm.