Ternary salts electrolyte for a phospho-olivine positive electrode
AssigneeGM Global Technology Operations LLC
InventorsMeinan He, Mei Cai
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Abstract
An electrochemical cell according to various aspects of the present disclosure includes a positive electrode, a negative electrode, a separator, and an electrolyte. The positive electrode includes a positive electroactive material. The positive electroactive material includes a phospho-olivine compound. The negative electrode includes lithium metal. The separator is between the positive electrode and the negative electrode. The separator is electrically insulating and ionically conductive. The electrolyte includes a ternary salt and a solvent. The ternary salt includes LiPF6, LiFSI, and LiClO4.
Claims20
An electrochemical cell comprising:
- a positive electrode including a positive electroactive material comprising a phospho-olivine compound;
- a negative electrode comprising lithium metal;
- a separator between the positive electrode and the negative electrode, the separator being electrically insulating and ionically conductive;
- and
- an electrolyte, the electrolyte comprising,
- a ternary salt including LiPF6, LiFSI, and LiClO4, and
- a solvent, wherein
- a total molarity of the ternary salt in the solvent is greater than or equal to about 0.5M to less than or equal to about 2M,
- a first molarity of the LiClO4 in the solvent is greater than or equal to about 0.1 M to less than or equal to about 0.2M,
- a second molarity of the LiPF6 in the solvent is greater than or equal to about 0.1 M to less than or equal to about 1.4M, and
- a third molarity of the LiFSI is greater than or equal to about 0.1 M to less than or equal to about 1.4M.
An electrolyte system comprising:
- a solvent comprising,
- a fluorinated cyclic carbonate, and
- a linear carbonate;
- and
- a ternary salt in the solvent at a total molarity of greater than or equal to about 0.5M to less than or equal to about 2M, the ternary salt comprising,
- LiClO4 at a first molarity of greater than or equal to about 0.1 M to less than or equal to about 0.2M,
- LiPF6 at a second molarity of greater than or equal to about 0.1 M to less than or equal to about 1.4M, and
- LiFSI at a third molarity of greater than or equal to about 0.1 M to less than or equal to about 1.4M.
Dependencies are inferred from the claim text.