Rechargeable positive electrode
AssigneePolyPlus Battery Company
InventorMay-Ying Chu
Life of this patent
Estimating the term…
Abstract
Disclosed are battery cells comprising a sulfur-based positive composite electrode. Preferably, said cells are secondary cells, and more preferably thin film secondary cells. In one aspect, the cells can be in a solid-state or gel-state format wherein either a solid-state or gel-state electrolyte separator is used. In another aspect of the invention, the cells are in a liquid format wherein the negative electrode comprises carbon, carbon inserted with lithium or sodium, or a mixture of carbon with lithium or sodium. The novel battery systems of this invention have a preferred operating temperature range of from -40.degree. C. to 145.degree. C. with demonstrated energies and powers far in excess of state-of-the-art high-temperature battery systems.
Claims61
A battery cell which comprises:
- a) a positive electrode comprising a mixture of
- i) between about 20% to about 80% active-sulfur in percent by weight;
- ii) a gel-state or solid-state ionically conductive material in percent by weight between about 15% to 75%;
- and
- iii) an electronically conductive material in a percent by weight between about 5% and about 40%;
- the mixture having between about 10% and about 100% of the active-sulfur accessible to any charge carriers;
- b) a current collector electrically connected to the positive electrode;
- c) a negative electrode;
- and
- d) an electrolyte separator:
- wherein the active-sulfur is elemental sulfur or sulfur-containing discharge products of elemental sulfur.
A battery cell which comprises:
- (a) a positive composite electrode comprising active-sulfur in a percentage by weight from 20% to 80%, an ionically conductive material in a percentage by weight from 15% to 75%, and an electronically conductive material in a percentage by weight from 5% to 40%, the positive composite having between about 10% and about 100% of the active-sulfur accessible to any charge carriers;
- (b) a negative electrode;
- and
- (c) a solid-state electrolyte separator or a gel-state electrolyte separator:
- wherein the active-sulfur is elemental sulfur or sulfur-containing discharge products of elemental sulfur.
A battery cell which comprises:
- (a) a negative electrode which comprises carbon, carbon inserted with lithium or sodium, or a mixture of carbon with lithium or sodium;
- and
- (b) a positive composite electrode comprising active-sulfur in a percentage by weight of from 20% to 80%, an ionically conductive material in a percentage weight of from 15% to 75%, and an electronically conductive material in a percentage by weight from 5% to 40%, wherein the positive composite electrode has between about 10% mid about 100% of the active-sulfur accessible to any charge carriers, and wherein the active-sulfur is elemental sulfur or sulfur-containing discharge products of elemental sulfur.
A battery cell which comprises:
- a) a positive electrode consisting essentially of a mixture of
- i) between about 20% to about 80% active-sulfur in percent by weight;
- ii) a gel-state or solid-state ionically conductive material in percent by weight between about 15% to 75%;
- and
- iii) an electronically conductive material in a percent by weight between about 5% and about 40%;
- the mixture having between about 10% and about 100% of the active-sulfur accessible to any charge carriers;
- b) a current collector electrically connected to the positive electrode;
- c) a negative electrode;
- and
- d) an electrolyte separator;
- wherein the active-sulfur is elemental sulfur or sulfur-containing discharge products of elemental sulfur.
Dependencies are inferred from the claim text.