The voltage of a Li/S cell depends on the chemical entities in which electrical energy is stored, which change with the state of charge (Image: Lawrence Berkeley Lab)
A scanning electron micrograph of the nanostructure of the cathode of a Berkeley Li/S cell and a schematic of the layers in the structure (Image: Lawrence Berkeley Lab)
Performance curves of a Berkeley Li/S cell. Charge/discharge voltage history at extreme power levels (upper left); energy availability vs number of cycles at extreme power levels (upper right); and energy availability vs number of cycles at smaller power levels (Image: Lawrence Berkeley Lab)
Batteries. We buy them at the store, use them up, and throw them away without much thought. In reality, however, batteries are remarkably complex electrochemical devices that are continually evolving. The latest example of this comes from the Lawrence Berkeley National Laboratory, where researchers have invented an advanced lithium/sulfur (Li/S) cell that offers a unique combination of energy storage, power, recharge speed, and survivability.
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