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AssigneeHoneycomb Battery Company
InventorBor Z. Jang
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Provided is a method of improving a cycle-life of a rechargeable alkali metal-sulfur cell, the method comprising implementing an electronically non-conducting anode-protecting layer between an anode active material layer and a cathode active material without using a porous separator in the cell, wherein the anode-protecting layer has a thickness from 1 nm to 100 μm and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000%, a lithium ion or sodium ion conductivity from 10−8 S/cm to 5×10−2 S/cm, and an electronic conductivity less than 10−4 S/cm when measured at room temperature. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, no known dendrite issue, no dead lithium or dead sodium issue, and a long cycle life.
A method of improving a cycle-life of a rechargeable alkali metal-sulfur cell, said method comprising implementing an electronically non-conducting anode-protecting layer between an anode active material layer and a cathode active material without using a porous separator in said cell, by depositing a layer of an elastomer onto one primary surface of the anode active material layer to form a protected anode, wherein said anode-protecting layer has a thickness from 1 nm to 100 μm and the elastomer having a fully recoverable tensile elastic strain from 2% to 1,000%, a lithium ion or sodium ion conductivity from 10−8 S/cm to 5×10−2 S/cm, and an electronic conductivity less than 10−4 S/cm when measured at room temperature;
Dependencies are inferred from the claim text.