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US 2023/0155175 A1Published application
Electrolyte formulations for electrochemical cells containing a silicon electrode
AssigneeWildcat Discovery Technologies, Inc.
InventorsYe Zhu, Gang Cheng, Deidre Strand, Jen-Hsien Yang
Life of this patent
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Abstract
Additives to electrolytes that enable the formation of comparatively more robust SEI films on silicon-based anodes. The SEI films in these embodiments are seen to be more robust in part because the batteries containing these materials have higher coulombic efficiency and longer cycle life than comparable batteries without such additives. The additives preferably contain a dicarbonate group or are an organo-metallic hydride.
Claims20
An electrochemical cell comprising:
- a cathode comprising an active cathode material capable of reversible intercalation of lithium ions, the active cathode material comprising lithium, nickel, manganese, and cobalt;
- a silicon alloy anode that comprises silicon and graphite, the graphite present at 50% weight percent to 95 weight percent of a total weight of the silicon alloy anode;
- and
- a liquid electrolyte solution comprising an organic solvent, a lithium salt, and an additive, wherein the organic solvent comprises ethylene carbonate (EC) and the additive is one of diallyl dicarbonate, dimethyl dicarbonate, diethyl dicarbonate, or dibenzyl dicarbonate.
1 more element
An electrochemical cell comprising:
- a cathode comprising an active cathode material capable of reversible intercalation of lithium ions, wherein the active cathode material is represented by the chemical structural formula:
- LiNixMnyCozO2 (ii)
- where x+y+z=1;
- a silicon alloy anode that comprises silicon and graphite, the graphite present at 50 weight percent to 95 weight percent of a total weight of the silicon alloy anode;
- and
- a liquid electrolyte solution comprising an organic solvent, a lithium salt, and an additive, wherein the organic solvent comprises ethylene carbonate (EC) and ethyl methyl carbonate (EMC), and the additive is one of diallyl dicarbonate, dimethyl dicarbonate, diethyl dicarbonate, or dibenzyl dicarbonate.
3 more elements
An electrochemical cell comprising:
- a cathode comprising an active cathode material capable of reversible intercalation of lithium ions;
- a silicon alloy anode that comprises silicon and graphite, the graphite present at 50 weight percent to 95 weight percent of a total weight of the silicon alloy anode;
- and
- a liquid electrolyte solution comprising an organic solvent, a lithium salt, and an additive, wherein the additive is diallyl dicarbonate or dibenzyl dicarbonate.
1 more element
Dependencies are inferred from the claim text.