Passivating agents for electrochemical cells
AssigneeSion Power Corporation
InventorsZhaohui Liao, Chariclea Scordilis-Kelley, Tracy Earl Kelley, Yuriy V. Mikhaylik, Holger Schneider
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Abstract
Articles and methods involving electrochemical cells and/or electrochemical cell preproducts comprising passivating agents are generally provided. In certain embodiments, an electrochemical cell includes first and second passivating agents. In some embodiments, an electrochemical cell may include a first electrode comprising a first surface, a second electrode (e.g., a counter electrode with respect to the first electrode) comprising a second surface, a first passivating agent configured and arranged to passivate the first surface, and a second passivating agent configured and arranged to passivate the second surface.
Claims20
An electrochemical cell, comprising:
- a first electrode comprising lithium, the first electrode comprising a first surface;
- a second electrode, the second electrode comprising a second surface;
- an electrolyte;
- a first passivating agent, wherein the first passivating agent comprises a carbamate group, wherein the first passivating agent comprises polycarbamate, lithium carbamate, lithium dithiocarbamate, lithium diethyldithiocarbamate, lithium N,N-dimethyldithiocarbamate, potassium carbamate, potassium dithiocarbamate, and/or potassium diethyldithiocarbamate;
- and
- a second passivating agent, wherein the second passivating agent comprises an (oxalato)borate group, and wherein the second passivating agent is present in the electrolyte at greater than or equal to 0.2 wt %.
An electrochemical cell, comprising:
- a first electrode comprising lithium, the first electrode comprising a first surface;
- a second electrode, the second electrode comprising a second surface;
- an electrolyte;
- a first passivating agent, wherein the first passivating agent comprises a carbamate group, wherein the first passivating agent comprises polycarbamate, lithium carbamate, lithium dithiocarbamate, lithium diethyldithiocarbamate, lithium N,N-dimethyldithiocarbamate, potassium carbamate, potassium dithiocarbamate, and/or potassium diethyldithiocarbamate;
- and
- a second passivating agent, wherein the second passivating agent comprises one or more of lithium difluoro(oxalato)borate, a species that is capable of undergoing polymerization to form a layer on the cathode during cell cycling, and a species absent a vinyl group but is capable of developing a vinyl group upon electrochemical cell cycling.
An electrochemical cell, comprising:
- a first electrode comprising lithium, the first electrode comprising a first surface;
- a second electrode, the second electrode comprising a second surface;
- an electrolyte;
- a first passivating agent, wherein the first passivating agent comprises polycarbamate, lithium carbamate, lithium dithiocarbamate, lithium diethyldithiocarbamate, lithium N,N-dimethyldithiocarbamate, potassium carbamate, potassium dithiocarbamate, and/or potassium diethyldithiocarbamate;
- and
- a second passivating agent, wherein the second passivating agent comprises one or more of a species comprising an (oxalato)borate group, a species that is capable of undergoing polymerization to form a layer on the cathode during cell cycling, a species which comprises a vinyl group, and a species absent a vinyl group but is capable of developing a vinyl group upon electrochemical cell cycling.
Dependencies are inferred from the claim text.