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:
a first electrode;
a second electrode;
a separator interposed between the first electrode and the second electrode;
a first current collector coupled with the first electrode, the first current collector configured to transfer electrons to and/or from the first electrode; and
an interrupt layer configured to interrupt a current flow within the battery upon exposure to a voltage in excess of a threshold, the interrupt layer interposed between the first electrode and the first current collector, the interrupt layer being laminated to the first current collector when the interrupt layer is unactivated, the interrupt layer being delaminated from the first current collector when activated by being exposed to the voltage in excess of the threshold, the delamination of the interrupt layer from the first current collector interrupting the current flow in the battery, the interrupt layer including a decomposable component configured to decompose in response to being exposed to the voltage in excess of the threshold, the decomposition of the decomposable component evolving a gas for delaminating the interrupt layer from the first current collector.
2. The battery of claim 1 , wherein the interrupt layer is porous and has a composition comprising:
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 interrupt layer 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 interrupt layer comprises greater than 30% ceramic powder by weight.
5. The battery of claim 2 , wherein the interrupt layer comprises greater than 50% ceramic powder by weight.
6. The battery of claim 2 , wherein the interrupt layer comprises greater than 70% ceramic powder by weight.
7. The battery of claim 2 , wherein the interrupt layer comprises greater than 75% ceramic powder by weight.
8. The battery of claim 2 , wherein the interrupt layer comprises greater than 80% ceramic powder by weight.
9. The battery of claim 2 , wherein the interrupt layer is permeable for transporting ionic charge carriers.
10. The battery of claim 1 , wherein the interrupt layer is non-porous and has a composition comprising:
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 interrupt layer is impermeable to a transport of ionic charge carriers.
12. The battery of claim 1 , wherein the interrupt layer is sacrificial at voltages above the threshold.
13. The battery of claim 12 , wherein the decomposable component comprises a ceramic powder that chemically decomposes to evolve the gas upon being exposed to the voltage in excess of the threshold.
14. The battery of claim 1 , wherein the gas is fire retardant.
15. A method comprising:
overcharging a battery to cause a voltage of the battery to increase above a threshold; and
in response to the voltage of the battery having increased above the threshold, interrupting, by a interrupt layer comprising the battery, the overcharging of the battery by at least interrupt a current flow within battery, the interrupt layer interposed between an electrode and a current collector comprising the battery, the interrupt layer including a decomposable component configured to decompose in response to the voltage of the battery having increased above the threshold, the decomposition of the decomposable component evolving a gas for delaminating the interrupt layer from the current collector.