Electrode containing both anion-absorbing and cation-absorbing active materials
AssigneeSamsung Electronics Co., Ltd.
InventorsKaren E. Thomas-Alyea, Masoud Aryanpour, Jeong-Ju Cho
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Abstract
An electrode is provided having a front region adjacent to a separator and a back region adjacent to a current collector. The electrode includes an anion-absorbing material and a cation-absorbing material. The electrode exhibits a compositional profile such that the anion-absorbing material is present at a higher volume percent at the back region than at the front region. Also provided are electrochemical cells that employ such an electrode as a positive electrode. Optionally, the cells include an electrolyte comprised of a solution of a solvent and a salt dissolved therein at a concentration of at least about 2M when the cell is in a fully discharged state.
Claims26
A positive electrode having a front region adjacent to a separator and a back region adjacent to a current collector, the positive electrode comprising:
- an anion-absorbing material comprising an organic radical polymer, a conjugated polymer, or a combination thereof;
- and
- a cation-absorbing material, wherein the positive electrode exhibits a compositional profile such that the anion-absorbing material is present at a higher volume percent at the back region than at the front region.
An electrochemical cell comprising:
- a negative electrode containing a negative electrode material;
- a positive electrode containing a positive electrode material;
- a separator having pores therein interposed between the negative and positive electrodes;
- and
- an electrolyte filling the separator and electrode pores,
- wherein the positive electrode
- has a front region adjacent to the separator and a back region adjacent to a current collector,
- comprises an anion-absorbing material and a cation-absorbing material, and
- exhibits a compositional profile such that the anion-absorbing material is present at a higher volume percent at the back region than at the front region, and
- wherein the anion-absorbing material comprises an organic radical polymer, a conjugated polymer, or a combination thereof.
A positive electrode having a front region adjacent to a separator and a back region adjacent to a current collector, the electrode comprising:
- an anion-absorbing material;
- and
- a cation-absorbing material,
- wherein the electrode exhibits a compositional profile such that the anion-absorbing material is present at a higher volume percent at the front region than at the back region.
Dependencies are inferred from the claim text.