Rechargeable battery with voltage activated current interrupter
A high energy density rechargeable metal-ion battery includes an anode energy layer, a cathode energy layer, a separator for separating the anode and the cathode energy layers, an anode current collector for transferring electrons to and from the anode energy layer, the battery characterized by a maximum safe voltage for avoiding overcharge, and an interrupt layer that interrupts current within the battery upon exposure to voltage in excess of the maximum safe voltage. The interrupt layer is between the anode energy layer and current collector. When unactivated, it is laminated to the cathode current collector, conducting current therethrough. When activated, the interrupt layer delaminates from the anode current collector, interrupting current therethrough. The interrupt layer includes a voltage sensitive decomposable component that upon exposure to voltage in excess of the maximum safe voltage decomposes, evolving a gas, delaminating the interrupt layer from the anode current collector, interrupting current therethrough.
1. A battery, comprising:
an anode energy layer;
a cathode energy layer;
a separator interposed between the anode energy layer and the cathode energy layer;
an anode current collector configured to transfer electrons to and/or from the anode energy layer; and
an interrupt layer interposed between the anode energy layer and the anode current collector, the interrupt layer comprising a voltage sensitive material configured to delaminate the interrupt layer from the anode current collector by at least decomposing upon exposure to a voltage in excess of a maximum safe voltage for the battery, the decomposition of the voltage sensitive material generating a gas that causes the delamination of the interrupt layer from the anode current collector, and the delamination of the interrupt layer from the anode current collector interrupting a current flow through the anode current collector.
2. The battery of claim 1 , wherein the voltage sensitive material is porous and comprises:
a ceramic powder defining an interstitial space;
a binder for partially filling the interstitial space for binding the ceramic powder; and
a conductive component dispersed within the binder for imparting conductivity to the interrupt layer, the interstitial space remaining partially unfilled for imparting porosity and permeability to the interrupt layer.
3. The battery of claim 2 , wherein the voltage sensitive material is compacted for reducing the unfilled interstitial space and increasing the binding of the ceramic powder by the binder.
4. The battery of claim 2 , wherein the voltage sensitive material comprises greater than 30% ceramic powder by weight.
5. The battery of claim 2 , wherein the voltage sensitive material comprises greater than 50% ceramic powder by weight.
6. The battery of claim 2 , wherein the voltage sensitive material comprises greater than 70% ceramic powder by weight.
7. The battery of claim 2 , wherein the voltage sensitive material comprises greater than 75% ceramic powder by weight.
8. The battery of claim 2 , wherein the voltage sensitive material comprises greater than 80% ceramic powder by weight.
9. The battery of claim 2 , wherein the voltage sensitive material is permeable for transporting ionic charge carriers.
10. The battery of claim 1 , wherein the voltage sensitive material is non-porous and comprises:
a non-conductive filler;
a binder for binding the non-conductive filler; and
a conductive component dispersed within the binder for imparting conductivity to the interrupt layer.
11. The battery of claim 10 , wherein the voltage sensitive material is impermeable to transport of ionic charge carriers.
12. The battery of claim 1 , wherein the voltage sensitive material is sacrificial at voltages above the maximum safe voltage.
13. The battery of claim 12 , wherein the voltage sensitive material includes a ceramic powder that chemically decomposes above the maximum safe voltage, and wherein the decomposition of the ceramic powder generates the gas.
14. The battery of claim 13 , wherein the gas is fire retardant.
15. The battery of claim 1 , wherein the decomposition of the voltage sensitive material transitions the interrupt layer from an unactivated state to an activated state, wherein the interrupt layer is laminated to the anode current collector when the interrupt layer is in the unactivated stated, and wherein the interrupt layer is delaminated from the anode current collector when the interrupt layer is in the activated state.
16. A method for interrupting a recharging process for a battery having a maximum safe voltage and comprising an anode energy layer, a cathode energy layer, a separator interposed between the anode energy layer and the cathode energy layer, and an anode current collector configured to transfer electrons to and/or from the anode energy layer, the method comprising:
delaminating, upon exposure to a voltage above the maximum safe voltage, an interrupt layer interposed between the anode energy layer and the anode current collector, the interrupt layer being delaminated from the anode current collector to at least interrupt a current flow through the anode current collector, the interrupt layer being delaminated by a decomposition of a voltage sensitive material comprising the interrupt layer, the decomposition of the voltage sensitive material generating a gas that causes the delamination of the interrupt layer from the anode current collector.
17. The method of claim 16 , wherein the decomposition of the voltage sensitive material transitions the interrupt layer from an unactivated state to an activated state, wherein the interrupt layer is laminated to the anode current collector when the interrupt layer is in the unactivated stated, and wherein the interrupt layer is delaminated from the anode current collector when the interrupt layer is in the activated state.