Electrolyte and lithium ion batteries made therewith

Patent metadata

Field	Value
Publication number	US-2025343263-A1
Application number	US-202519186766-A
Country	US
Kind code	A1
Filing date	Apr 23, 2025
Priority date	May 3, 2024
Publication date	Nov 6, 2025
Grant date	—

Abstract

Electrolytes comprising a solvating solvent, lithium salt comprised of lithium bis(fluorosulfonyl)imide, and an additive comprised of at least one of a bis(trifluoromethane)sulfonimide salt and a difluorophosphate salt in an amount of 0.05% to 5% by weight of the electrolyte.improve the cycling performance of lithium ion batteries and in particular lithium ion batteries having lithium metal anodes or anode-less anodes with an Li intercalating cathode (e.g., cathodes comprised of layered nickel, manganese cobalt oxides).

First claim

What is claimed is:

1 . An electrolyte comprising a solution comprised of a solvating solvent, lithium salt comprised of lithium bis(fluorosulfonyl)imide, and an additive comprised of at least one of a bis(trifluoromethane) sulfonimide salt and a difluorophosphate salt in an amount of 0.05% to 5% by weight of the electrolyte.

2 . The electrolyte of claim 1 , wherein the amount is 0.5% to 2%.

3 . The electrolyte of claim 1 , wherein the additive is comprised of the bis(trifluoromethane) sulfonimide salt.

4 . The electrolyte of claim 3 , wherein the bis(trifluoromethane) sulfonimide salt has a cation comprised of one or more of an organic cation, alkaline earth, Li, Cs and K.

5 . The electrolyte of claim 4 , wherein the cation is comprised of the alkaline earth.

6 . The electrolyte of claim 5 , wherein the alkaline earth is comprised of Ca.

7 . The electrolyte of claim 4 , wherein the cation is comprised of the organic cation.

8 . The electrolyte of claim 7 , wherein the organic cation is comprised of one or more of an ammonium, imidazolium and pyrrolidinium cation.

9 . The electrolyte of claim 1 , the lithium salt/the additive has a weight ratio of at least 5.

10 . The electrolyte of claim 9 , wherein the weight ratio is at least 8.

11 . The electrolyte of claim 1 , wherein the solvating solvent is comprised of one or more of dimethoxyethane (DM E), 1,2-diethoxyethane (DEE), and 1,2-dimethoxypropane (DM P).

12 . The electrolyte of claim 1 , wherein the electrolyte is a localized high salt concentration electrolyte (LHCE) further comprised of a diluent solvent.

13 . The electrolyte of claim 12 , wherein the diluent solvent is comprised of one or more of 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE); 1,2-tetrafluoroethyl ether (OFPTFEE); and 1,3-(1,1,2,2-Tetrafluoroethoxy) propane (TFEP).

14 . The electrolyte of claim 12 , wherein the LHCE is comprised of a lithium bis(fluorosulfonyl)imide (LiFSI), dimethoxyethane (DM E), 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) combination; LiFSI, DME, 1,2-(1,1,2,2-Tetrafluoroethoxy) ethane (TFEE) combination; LiFSI, DME, 1H,1H,5H-octafluoropentyl 1,1,2,2,-tetrafluoroethyl ether (OFPTFEE) combination; LiFSI, DME, 1,3-(1,1,2,2-Tetrafluoroethoxy) propane (TFEP) combination; LiFSI, DEE, TTE combination; LiFSI, DEE, TFEE combination; LiFSI, DEE, OFPTFEE combination; or LiFSI, DEE, TFEP combination.

15 . A battery comprised of the electrolyte of claim 1 , a cathode, anode and separator.

16 . The battery of claim 15 , wherein the anode is comprised of a lithium metal anode.

17 . The battery of claim 15 , wherein the anode is an anode-less anode.

18 . The battery of claim 15 , wherein the cathode is a layered oxide.

19 . The battery of claim 18 , wherein the layered oxide is comprised of Ni, Mn, Co.

20 . The battery of claim 19 , wherein the Ni is at least 50% by mole of the Ni, Mn and Co in the layered oxide.

Assignees

• Wildcat discovery technologies inc

Inventors

• Huang Jinhua
• Li Bin
• Bennington Peter
• Bravo Spencer

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title