US 11,591,294 B2 · Fluorenone/fluorenol derivatives for aqueous redox flow batteries

Abstract

Aqueous electrolytes comprising fluorenone/fluorenol derivatives are disclosed. The electrolyte may be an anolyte for an aqueous redox flow battery. In some embodiments, the compound, or salt thereof, has a structure according to any one of formulas I-III where Q1-Q4 independently are CH, C(R1) or N, wherein 0, 1, or 2 of Q1-Q4 are N; Q5-Q8 independently are CH, C(R2), or N, wherein 0, 1, or 2 of Q5-Q8 are N; Y is C═O or C(H)OH; R1 and R2 independently are an electron withdrawing group; n is an integer >1; and x and y independently are 0, 1, 2, 3, or 4, where at least one of x and y is not 0.

Claims21

Dependent claims

An aqueous composition comprising:

an aqueous anolyte comprising
(i) a compound or a salt thereof having a structure according to any one of formulas I-III
where Q1-Q4 independently are CH, C(R1) or N, wherein 0, 1, or 2 of Q1-Q4 are N,
Q5-Q8 independently are CH, C(R2), or N, wherein 0, 1, or 2 of Q5-Q8 are N,
Y is C═O or C(H)OH,
each R1 and R2 independently is an electron withdrawing group,
n is an integer >1, and
x and y independently are 0, 1, 2, 3, or 4, where if none of Q1-Q8 is N, then x and y are not 0, and
(a) R1 and R2 are different electron withdrawing groups, or
(b) the compound comprises two different R1 or two different R2 groups, or
(c) both (a) and (b);
(ii) a base;
and
(iii) water.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/097,715Filed 13 Nov 2020 · us provisional application

Priority

14 Nov 2019

Published

US 2021/0147347 A120 May 2021

Granted

28 Feb 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C07C 309/38
Of six-membered aromatic rings being part of condensed ring systems: formed by at least three rings
C07D 241/38
Condensed with carbocyclic rings or ring systems: with only hydrogen or carbon atoms directly attached to the ring nitrogen atoms
H01M 8/083
Fuel cells with aqueous electrolytes: alkaline fuel cells
H01M 8/188
Regeneration by electrochemical means: by recharging of redox couples containing fluids; Redox flow type batteries

Fluorenone/fluorenol derivatives for aqueous redox flow batteries

Life of this patent

Fluorenone/fluorenol derivatives for aqueous redox flow batteries

Life of this patent

Abstract

Claims21