초록 ▼

Disclosed are positive electrodes containing active-sulfur-based composite electrodes. The cells include active-sulfur, an electronic conductor, and an ionic conductor. These materials are provided in a manner allowing at least about 10% of the active-sulfur to be available for electrochemical react

Disclosed are positive electrodes containing active-sulfur-based composite electrodes. The cells include active-sulfur, an electronic conductor, and an ionic conductor. These materials are provided in a manner allowing at least about 10% of the active-sulfur to be available for electrochemical reaction. Also disclosed are methods for fabricating active-sulfur-based composite electrodes. The method begins with a step of combining the electrode components in a slurry. Next, the slurry is homogenized such that the electrode components are well mixed and free of agglomerates. Thereafter, before the electrode components have settled or separated to any significant degree, the slurry is coated on a substrate to form a thin film. Finally, the coated film is dried to form the electrode in such a manner that the electrode components do not significantly redistribute.

대표청구항 ▼

A method of preventing damage from overcharge, the method comprising the following steps: (a) providing a metal-sulfur cell having a first cell voltage which it attains when fully charged but not overcharged, the cell including a metal negative electrode and a sulfur positive electrode which positiv

A method of preventing damage from overcharge, the method comprising the following steps: (a) providing a metal-sulfur cell having a first cell voltage which it attains when fully charged but not overcharged, the cell including a metal negative electrode and a sulfur positive electrode which positive electrode includes i) active-sulfur; ii) an electronic conductor mixed with the active-sulfur so that electrons can move between the active-sulfur and the electronic conductor; and iii) an ionic conductor mixed with the active-sulfur so that ions can move between the ionic conductor and the active-sulfur; and (b) charging said metal-sulfur cell to a level beyond the normal charge capacity while the cell maintains an overcharge cell voltage that is not substantially higher than the first cell voltage, wherein the sulfur positive electrode has between about 10% and about 100% of the active-sulfur is available for electrochemical reaction.