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High energy density redox flow device

A technology of energy storage device, oxygen atom, applied in battery/fuel cell control device, vehicle energy storage, transportation and packaging, etc., can solve problems such as low energy density

Inactive Publication Date: 2015-06-10
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of such fluidized bed batteries remains relatively low even when using electrolytes with particle suspensions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0226] Example 1: Semi-solid lithium redox flow battery

[0227] figure 2 An exemplary redox flow battery 200 for a lithium system is shown in . In this embodiment, the membrane 210 is a microporous membrane, such as a polymer separator (eg, Celgard TM 2400), or solid nonporous membranes that are lithium-ion conductors. The negative and positive current collectors 240, 250 are made of copper and aluminum, respectively. The negative electrode composition includes graphite or hard carbon black suspension. The cathode composition includes LiCoO as a redox active component 2 or LiFePO 4 . Carbon fines are optionally added to the cathode or anode suspension to improve the electronic conductivity of the suspension. The solvent in which the positive and negative active material particles are suspended is a mixture of alkyl carbonates and includes dissolved lithium salts such as LiPF 6 . The positive electrode composition is stored in positive electrode storage tank 260 and...

Embodiment 2

[0230] Example 2: Semi-solid nickel metal hydride redox flow battery

[0231] image 3 An exemplary redox flow battery for the nickel system is shown in . In this embodiment, membrane 310 is a microporous electrolyte permeable membrane that prevents cathode particles 320 and anode particles 330 from passing through the membrane, or a solid non-porous membrane that is a proton ion conductor, such as Nafion. Both negative and positive current collectors 340, 350 are made of carbon. The negative electrode composition includes a suspension of a hydrogen-absorbing metal M. The cathode composition includes NiOOH as a redox active component. Optionally, carbon fines are added to the cathode or anode suspension to improve the electronic conductivity of the suspension. The solvent in which the positive and negative active material particles are suspended is an aqueous solution containing a hydroxyl-generating salt such as KOH. The positive electrode composition is stored in positi...

Embodiment 3

[0233] Example 3: Redox flow battery monitored by reference electrode

[0234] Figure 4 An exemplary redox flow battery using a reference electrode to optimize battery performance is shown in . The cell includes two membranes 410,415. Between the two membranes 410, 415, a reference electrode 420 is positioned on the face opposite the electroactive regions 440, 445 in which the positive redox flow composition 442 and the negative redox flow composition 447 respectively flow , 425, 430. The cell also includes negative and positive current collectors 450, 460, respectively.

[0235] The potential at each reference electrode 420, 425 and 430 can be measured and assigned the value φ 1 , φ 2 and φ 3 . It is also possible to measure the potentials at the working electrodes (collectors) 450, 460, and assign them as W 1 and W 2 . The potential difference of battery components can be measured as follows:

[0236] (W 1 -W 2 ) = battery voltage

[0237] (W 2 -φ 3 ) = Pote...

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Abstract

Redox flow devices are described in which at least one of the positive electrode or negative electrode-active materials is a semi-solid or is a condensed ion-storing electroactive material, and in which at least one of the electrode-active materials is transported to and from an assembly at which the electrochemical reaction occurs, producing electrical energy. The electronic conductivity of the semi-solid is increased by the addition of conductive particles to suspensions and / or via the surface modification of the solid in semi-solids (e.g., by coating the solid with a more electron conductive coating material to increase the power of the device). High energy density and high power redox flow devices are disclosed. The redox flow devices described herein can also include one or more inventive design features. In addition, inventive chemistries for use in redox flow devices are also described.

Description

[0001] This application is a divisional application of Chinese patent application 201080063874.1 with a filing date of December 16, 2010 and an invention title of "High Energy Density Redox Flow Device". [0002] related application [0003] This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Serial No. 61 / 287,180, filed December 16, 2009, entitled "High Energy Density Redox Flow Device." Each of these applications is hereby incorporated by reference in its entirety for all purposes. [0004] incorporated by reference [0005] All patents, patent applications, and literature cited herein are hereby incorporated by reference in their entirety for all purposes. [0006] Statement Regarding Federally Sponsored Research or Development [0007] This invention was made with government support under grant number DE-FC26-05NT42403 awarded by the Department of Energy. The government has certain rights in this invention. Background techniq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M14/00B60L11/18C01B32/60
CPCB60L58/27B60L50/64H01M4/36H01M4/624H01M14/00Y02T10/70Y02E60/10Y02E60/50
Inventor 姜一民W·C·卡特尔B·H·侯M·杜杜塔P·利姆颂库尔
Owner MASSACHUSETTS INST OF TECH
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