Electrochemical cell with TMCCC electrodes in an acetonitrile solvent including a dinitrile additive

Patent metadata

Field	Value
Publication number	US-11876182-B2
Application number	US-202318221724-A
Country	US
Kind code	B2
Filing date	Jul 13, 2023
Priority date	Jun 11, 2020
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A system and method for a liquid electrolyte used in secondary electrochemical cells having at least one electrode including a TMCCC material, the liquid electrolyte enabling an increased lifetime while allowing for fast discharge to extremely high depth of discharge. The addition of dinitriles to liquid electrolytes in electrochemical cells in which energy storage is achieved by ion intercalation in transition metal cyanide coordination compounds (TMCCC) has the advantage of increasing device lifetime by inhibiting common chemical and electrochemical degradation mechanisms.

First claim

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. An electrochemical cell, comprising:
an electrolyte;
an anode electrode in electrical communication with said electrolyte; and
a cathode electrode in electrical communication with said electrolyte;
wherein said anode electrode includes a transition metal cyanide coordination compound material;
wherein said electrolyte includes one or more solvents and one or more alkali metal salts in solution with said one or more solvents, and an additive disposed within said one or more solvents;
wherein at least one solvent of said one or more solvents includes a methyl cyanide having a formula X-W wherein X identifies a functional group including one or more species CN, O, F, and W identifies a linear alkane or alkene group and wherein said additive of said electrolyte includes a general formula X-W′-X with W′ different from W;
wherein said additive includes a dinitrile material;
wherein said transition metal cyanide coordination compound material includes a composition A x P y [R(CN) (6) ] z n(H 2 O), wherein A includes an alkali metal cation, wherein P includes a transition metal cation, wherein R includes a transition metal cation, and wherein 0≤x≤2, y=1, 0.75≤z≤1, and 0≤n≤6; and
wherein R includes Mn; and
wherein said electrolyte further includes a quantity Q of water, Q>0.

2. The electrochemical cell of claim 1 in which said dinitrile material includes a linear dinitrile material.

3. The electrochemical cell of claim 2 in which said linear dinitrile material includes succinonitrile.

4. The electrochemical cell of claim 2 in which said linear dinitrile material includes adiponitrile.

5. The electrochemical cell of claim 1 having a weight ratio N of said solvent to said additive wherein 70:30<N<99:1.

6. The electrochemical cell of claim 1 wherein A includes one or more of Li, Na, K, Rb, and Cs cations.

7. The electrochemical cell of claim 1 wherein P of said anode electrode includes at least one of manganese and iron.

8. The electrochemical cell of claim 1 wherein said at least one solvent includes acetonitrile.

9. The electrochemical cell of claim 3 wherein said at least one solvent includes acetonitrile.

Assignees

• Natron Energy Inc

Inventors

• Keshavarz Majid
• Friebel Daniel
• Herman Peter Benjamin
• Yee Grace Marjorie
• Klevay Alex J

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M10/0525

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