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Stable and high-capacity neutral aqueous liquid flow lithium battery based on redox targeting reaction

A lithium battery, high-capacity technology, used in fuel cells, aqueous electrolytes, regenerative fuel cells, etc.

Active Publication Date: 2021-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a stable and high-capacity neutral water flow lithium battery system based on redox targeting reaction, which solves the technical problem that the existing flow batteries can only work at low current density

Method used

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  • Stable and high-capacity neutral aqueous liquid flow lithium battery based on redox targeting reaction
  • Stable and high-capacity neutral aqueous liquid flow lithium battery based on redox targeting reaction
  • Stable and high-capacity neutral aqueous liquid flow lithium battery based on redox targeting reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: as figure 2 As shown, the liquid flow battery includes splints, end plates, current collectors, bipolar plates, electrode frames, electrodes, ion exchange membranes and gaskets, and both sides of the ion exchange membranes are connected to the electrodes, electrode frames, bipolar The pole plates, current collectors, end plates and splints are connected in sequence, and the splints on both sides are fastened and connected by screws. The splint is made of stainless steel, the end plate is made of polytetrafluoroethylene, the current collector is made of copper, the bipolar plate is made of flexible graphite, the electrode frame is made of polytetrafluoroethylene, the The electrode is a graphite felt electrode, and the sealing gasket is a silica gel sealing gasket. For [Fe(CN) 6 ] 4- / 3- -LFP / FP symmetric flow battery and Zn / [Fe(CN) 6 ] 3- -LFP aqueous flow battery, the effective area of ​​the battery is 4.5x 3.0cm 2 . The cation exchange membrane Naf...

Embodiment 2

[0032] Embodiment 2: the difference between this embodiment and embodiment 1 is that with 11.5ml 0.7M[Fe(CN) 6 ] 3- and a neutral solution of 3M LiCl supporting salt as the positive electrode electrolyte, with 40mL 0.35M ZnCl 2 And the neutral solution of 3M LiCl supporting salt is used as negative electrode electrolyte, and 2.1g LFP particle (the content of LFP is 80wt.%) is housed in the positive electrode storage tank. The device used and other steps and parameters are the same as in Example 1.

[0033] The present invention starts from the Nernst equation of lithium iron phosphate intercalation and delithiation, by changing the Li of the electrolyte solution + Concentration (1M ~ 10M) to adjust the redox potential of lithium iron phosphate, to achieve the same as [Fe(CN) 6 ] 4- / 3- Redox potential matching. The redox potential of LiFePO4 was measured using an electrochemical workstation (CHI660D, CH Instruments) in a three-electrode configuration consisting of glassy c...

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Abstract

The invention discloses a stable and high-capacity neutral aqueous liquid flow lithium battery based on redox targeting reaction, which belongs to the technical field of liquid flow lithium batteries. The technical problem that an existing liquid flow battery can only work at low current density is solved. The liquid flow lithium battery comprises a positive electrode storage tank and a negative electrode storage tank, the positive electrode storage tank is filled with a positive electrode electrolyte, the negative electrode storage tank is filled with a negative electrode electrolyte, and the liquid flow lithium battery is characterized in that the positive electrode electrolyte of the liquid flow lithium battery comprises a salt containing [Fe(CN)6]<4-> and / or [Fe(CN)6]<3->, and the positive electrode storage tank is also filled with LFP particles and / or FP particles. The battery has a wide application prospect in the field of large-scale energy storage.

Description

technical field [0001] The invention belongs to the technical field of liquid flow batteries; in particular, it relates to a stable and high-capacity neutral water-based liquid flow lithium battery based on redox targeted reactions. Background technique [0002] With the depletion of fossil energy and the pollution of the ecological environment, the development of new energy is imperative. In order to solve the instability, discontinuity and uncontrollability of new energy in the development process, as well as the peak and frequency modulation in the grid-connected process, it is necessary to develop high-capacity electric energy storage technology. Compared with other electrochemical energy storage technologies, redox flow battery (RFB) has the advantages of independent energy storage and power output, easy to scale, etc., and has become one of the preferred technologies for large-scale stationary energy storage. As the most mature RFB technology, vanadium flow battery (V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002Y02E60/50
Inventor 秦伟贾鑫吴晓宏姚远卢松涛
Owner HARBIN INST OF TECH
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