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Driven electrochemical cell for electrolyte state of charge balance in energy storage devices

An electrochemical and electrolyte technology, applied in electrolyte flow processing, electrochemical generators, fuel cells, etc., can solve problems such as loss, imbalance between positive and negative electrolytes, and unbalanced performance

Inactive Publication Date: 2016-08-10
LOCKHEED MARTIN ADVANCED ENERGY STORAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But after the system has gone through some charge / discharge cycles, the positive and negative electrolytes can become unbalanced due to side reactions during these operations, such as hydrogen or oxygen from water if overpotential conditions are violated, causing Imbalance and associated performance loss

Method used

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  • Driven electrochemical cell for electrolyte state of charge balance in energy storage devices
  • Driven electrochemical cell for electrolyte state of charge balance in energy storage devices
  • Driven electrochemical cell for electrolyte state of charge balance in energy storage devices

Examples

Experimental program
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Effect test

example 12

[0083] Example 1.2 - Preparation of an effective area of ​​25cm 2 Experimental procedure of the flow battery pack

[0084] The present invention involves the use of two electrochemical cells, a primary electrochemical cell that performs the charge / discharge function of an energy storage device and a secondary cell that maintains the SOC balance of the electrolyte in the primary cell. The secondary battery in the present invention takes the form of a powered, hydrogen scavenging battery that can be coupled to the battery system to avoid electrolyte imbalances that would occur during operation of the primary battery.

[0085] Non-limiting examples of the primary battery of the present invention are described herein. Designed for 25cm 2 The active area and battery hardware for acid flow improvement was purchased from Fuel Cell Technologies (Albuquerque, NM). MGL 370 carbon paper was purchased from Fuel Cell Earth (Stoneham, MA) and spray coated with Mogul-L High Surface Area C...

example 13

[0087] Example 1.3 Prepare an effective area of ​​25cm 2 Experimental procedure for additional batteries

[0088] Non-limiting examples of second or additional batteries for use in the present invention are described herein. Designed for 25cm 2 The active area and acid flow modified battery hardware was purchased from Fuel Cell Technologies (Albuquerque, NM). Use a Pt loading of 0.3mg / cm by coating on one side 2 Membrane electrode assemblies (Ion-Power, Newcastle, DE) were composed of NR-212 cation exchange membranes with Pt / C layer as the catalyst. The gas electrodes utilized Teflon-coated Toray 120 hydrophobic gas diffusion layer material and the liquid electrodes utilized MGL370 carbon paper, both commercially available from Fuel Cell Earth (Stoneham, MA). A gas blower from Barber-Nichols (Arvada, CO) can be used to circulate the headspace gas mixture through the hydrogen scavenging cell. Electrochemical performance was tested and additional cells were controlled using...

example 2

[0089] Example 2 Operating a flow battery cell without an integrated additional battery

[0090] Redox flow battery cells without integrated additional cells According to Example 1.3, image 3 Assemble as described in . Titanium dicatecholate monopyrogallate (Ti(cat) 2 (gal) 2- ) and ferrocyanide (Fe(CN) 6 4- ) metal-ligand coordination compounds are used as active materials for the negative electrode electrolyte and the positive electrode electrolyte, respectively. Prepare the active material with a concentration of 1.5M, put it into a separate storage container, spray it with argon for 20 minutes, and flow it through a 25cm 2 carbon paper electrodes and Na + Form of NAFION TM Flow battery cells assembled with cation-selective membranes (50 μm thick). The battery was initially charged from 0 to 50% state of charge and OCV measurements were collected. Then, at 200mA / cm 2 Charge / discharge cycles were collected by sweeping the SOC of the battery from 20%-80% at a curre...

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Abstract

The invention concerns redox flow batteries comprising one or more electrochemical cells in fluid contact with an electrochemical balancing cell, the balancing cell comprising: (i) a first electrode comprising a gas diffusion electrode and the first electrode comprising a hydrogen oxidation catalyst, wherein the first electrode being maintained at a potential more positive than the thermodynamic potential for hydrogen evolution; (ii) a second electrode, the second electrode contacting negative electrolyte, and the second electrode being maintained at a potential sufficiently negative to reduce the negative electrolyte; (iii) a membrane disposed between the positive electrode and the negative electrode, the membrane being suitable to allow hydrogen cations to flow from the membrane to the negative electrolyte; and (iv) a means for contacting hydrogen with the first electrode.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application No. 61 / 898,750, filed November 1, 2013, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present invention relates to energy storage devices with additional balancing cells for balancing the energy in electrochemical cells in such devices. Background technique [0004] Flow batteries are electrochemical energy storage systems in which electrochemical reactants, typically redox-active compounds, are dissolved in liquid electrolytes that are contained separately in the negative and positive electrolyte cycles and circulated through the reaction cell, in In a reaction cell, electrical energy is either converted to or extracted from the chemical potential energy in the reactants through reduction and oxidation reactions. Especially in larger systems that may include multiple electrochemical cells and multiple stack...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M8/2495H01M4/92H01M4/96H01M16/00
CPCH01M4/92H01M4/96H01M8/04186H01M8/04276H01M8/188H01M8/2495H01M16/00Y02E60/50H01M8/06H01M8/1023H01M8/1039H01M2008/1095
Inventor 亚瑟·J·埃斯魏因约翰·戈尔茨
Owner LOCKHEED MARTIN ADVANCED ENERGY STORAGE
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