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US 2021/0083294 A1Published application
Electrode additives and coatings for minimizing cathode transition metal dissolution
AssigneeGM Global Technology Operations LLC
InventorsXingcheng XIAO, Jin LIU, Jiagang XU, Mei CAI, Sherman H. ZENG
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Abstract
An electrode including an electrode active material and a ceramic hydrofluoric acid (HF) scavenger is provided. The ceramic hydrofluoric acid (HF) scavenger includes M2SiO3, MAlO2, M2O—Al2O3—SiO2, or combinations thereof, where M is lithium (Li), sodium (Na), or combinations thereof. Methods of making the electrode are also provided.
Claims20
An electrode comprising:
- an electrode active material;
- and
- a ceramic hydrofluoric acid (HF) scavenger, wherein the ceramic HF scavenger comprises M2SiO3, MAlO2, M2O—Al2O3—SiO2, or combinations thereof, where M is lithium (Li), sodium (Na), or combinations thereof.
A method of fabricating an electrode that scavenges hydrofluoric acid (HF), the method comprising:
- mixing a ceramic hydrofluoric acid (HF) scavenger powder into a solution comprising a binder dissolved in a solvent to form a slurry having a viscosity of greater than or equal to about 5000 cps to less than or equal to about 6000 cps, the ceramic hydrofluoric acid (HF) scavenger comprising M2SiO3, MAlO2, M2O—Al2O3—SiO2, or combinations thereof, where M is lithium (Li), sodium (Na), or combinations thereof;
- casting a continuous layer of the slurry onto a surface of an electrode;
- removing the solvent from the slurry to form a coating on the electrode, wherein the coating has a first porosity and scavenges hydrofluoric acid (HF).
A method of fabricating an electrode that scavenges hydrofluoric acid (HF), the method comprising:
- mixing a powder of a ceramic hydrofluoric acid (HF) scavenger into a solution comprising a binder dissolved in a solvent to form a slurry having a viscosity of greater than or equal to about 200 cps and less than or equal to about 1000 cps, the ceramic hydrofluoric acid (HF) scavenger comprising M2SiO3, MAlO2, M2O—Al2O3—SiO2, or combinations thereof, where M is lithium (Li), sodium (Na), or combinations thereof;
- mixing a cathode active material into the slurry until the slurry has a viscosity of greater than or equal to about 4000 cps to less than or equal to about 6000 cps;
- casting a continuous layer of the slurry onto a current collector;
- and
- removing the solvent from the slurry to generate the electrode that scavenges hydrofluoric acid (HF), the electrode having a first porosity,
- wherein the electrode that scavenges hydrofluoric acid (HF) comprises the ceramic hydrofluoric acid (HF) scavenger embedded within the cathode active material.
3 more elements
Dependencies are inferred from the claim text.