Electrolyte additives for capacitor-assisted battery

Patent metadata

Field	Value
Publication number	US-12548795-B2
Application number	US-202217877011-A
Country	US
Kind code	B2
Filing date	Jul 29, 2022
Priority date	May 27, 2022
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A capacitor-assisted battery includes an electrolyte having a lithium-ion conducting component and one or more additives. The one or more additives include a first additive that includes 3-trimethylsilylphenylboronic acid and a second additive that includes succinic anhydride. The capacitor-assisted battery includes an electrode having an electroactive material and a capacitor material. The electroactive material has a first coating defined thereon, and the capacitor material has a second coating defined thereon. The first and second coatings are defined by the first and second additives. The first coating is a substantially continuous coating that covers greater than or equal to about 80% of a total exposed surface area of the electroactive material. The second coating is a discontinuous coating covers greater than or equal to about 20% to less than or equal to about 80% of a total exposed surface area of capacitor material.

First claim

What is claimed is:

1 . An electrolyte for a capacitor-assisted battery, the electrolyte comprising:
a lithium-ion conducting component; greater than or equal to 2 wt. % to less than or equal to 5 wt. % of a first additive comprising 3-trimethylsilylphenylboronic acid; and greater than or equal to 1 wt. % to less than or equal to 5 wt. % of a second additive comprising succinic anhydride.

2 . The electrolyte of claim 1 , wherein the lithium-ion conducting component is a lithium salt selected from the group consisting of: lithium hexafluorophosphate, lithium perchlorate, lithium tetrachloroaluminate, lithium iodide, lithium bromide, lithium thiocyanate, lithium tetrafluoroborate, lithium tetraphenylborate, lithium bis(oxalato)borate, lithium difluorooxalatoborate, lithium hexafluoroarsenate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethane)sulfonylimide, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, and combinations thereof.

3 . The electrolyte of claim 2 , wherein the electrolyte has a lithium salt concentration greater than or equal to about 0.6 M to less than or equal to about 2.0 M.

4 . The electrolyte of claim 1 , wherein the electrolyte further comprises a solvent selected from the group consisting of: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, methyl acetate, methyl propionate, γ-butyrolactone, γ-valerolactone, and combinations thereof.

5 . A capacitor-assisted battery comprising:
a capacitor-assisted electrode, the capacitor-assisted electrode comprising a capacitor material and an electroactive material that cycles lithium ions; and an electrolyte comprising:
a lithium-ion conducting component;
greater than or equal to 2 wt. % to less than or equal to 5 wt. % of 3-trimethylsilylphenylboronic acid; and
greater than or equal to 1 wt. % to less than or equal to 5 wt. % succinic anhydride,
the 3-trimethylsilylphenylboronic acid and the succinic anhydride together defining a first coating on the electroactive material and a second coating on the capacitor material.

6 . The capacitor-assisted battery of claim 5 , wherein the first coating is a substantially continuous that covers greater than or equal to about 80% of a total exposed surface area of the electroactive material.

7 . The capacitor-assisted battery of claim 5 , wherein the first coating has an average thickness greater than or equal to about 1 nanometer to less than or equal to about 100 nanometers.

8 . The capacitor-assisted battery of claim 5 , wherein the second coating is a discontinuous coating having a plurality of pores.

9 . The capacitor-assisted battery of claim 8 , wherein the second coating covers greater than or equal to about 20% to less than or equal to about 80% of a total exposed surface area of capacitor material.

10 . The capacitor-assisted battery of claim 5 , wherein the second coating has an average thickness greater than or equal to about 1 nanometer to less than or equal to about 500 nanometers.

11 . The capacitor-assisted battery of claim 5 , wherein the lithium-ion conducting component is a lithium salt selected from the group consisting of: lithium hexafluorophosphate, lithium perchlorate, lithium tetrachloroaluminate, lithium iodide, lithium bromide, lithium thiocyanate, lithium tetrafluoroborate, lithium tetraphenylborate, lithium bis(oxalato)borate, lithium difluorooxalatoborate, lithium hexafluoroarsenate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethane)sulfonylimide, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, and combinations thereof.

12 . The capacitor-assisted battery of claim 11 , wherein the electrolyte has a lithium salt concentration greater than or equal to about 0.6 M to less than or equal to about 2.0 M.

13 . The capacitor-assisted battery of claim 5 , wherein the electrolyte further comprises a solvent selected from the group consisting of: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, methyl acetate, methyl propionate, γ-butyrolactone, γ-valerolactone, and combinations thereof.

14 . The capacitor-assisted battery of claim 5 , wherein the electroactive material is a positive electroactive material.

15 . The capacitor-assisted battery of claim 14 , wherein the positive electroactive material is selected from the group consisting of: LiNi x Mn y Co z Al (1-x-y-z) O 2 (where 0.33≤x≤0.96, 0.03≤y≤0.33, 0.005≤z≤0.33), LiNi x Mn y Co 1-x-y O 2 (where 0.33≤x≤0.96 and 0.04≤y≤0.33), LiNi x Mn 1-x O 2 (where 0≤x≤1), and combinations thereof.

16 . A capacitor-assisted battery comprising:
an electrolyte comprising:
a lithium-ion conducting component;
greater than or equal to 2 wt. % to less than or equal to 5 wt. % of a first additive comprising 3-trimethylsilylphenylboronic acid; and
greater than or equal to 1 wt. % to less than or equal to 5 wt. % of a second additive comprising succinic anhydride; and
a capacitor-assisted electrode comprising:
an electroactive material having a first coating defined thereon, the first coating being a substantially continuous that covers greater than or equal to about 80%, of a total exposed surface area of the electroactive material, the first coating defined by the first and second additives; and
a capacitor material having a second coating defined thereon, the second coating being a discontinuous coating covers greater than or equal to about 20% to less than or equal to about 80% of a total exposed surface area of capacitor material, the second coating also defined by the first and second additives.

17 . The capacitor-assisted battery of claim 16 , wherein
the lithium-ion conducting component comprises a lithium salt, and the electrolyte has a lithium salt concentration greater than or equal to about 0.6 M to less than or equal to about 2.0 M.

18 . The capacitor-assisted battery of claim 16 , wherein
the first coating has an average thickness greater than or equal to about 1 nanometer to less than or equal to about 100 nanometers, and the second coating has an average thickness greater than or equal to about 1 nanometer to less than or equal to about 500 nanometers.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Kong Dewen
• Liu Haijing
• Xing Lidan

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M16/00

  Structural combinations of different types of electrochemical generators · CPC title

• H01M10/0525

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