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A neutral lithium-bromine flow battery

A flow battery and flow battery technology, which is applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of small ionic radius and reduce the stability of long-cycle processes, and achieve improved utilization, excellent ionic conductivity and Structural stability, effect of high working voltage

Active Publication Date: 2021-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the M in its ion channel 1 The supporting ion of the site is Na + or Li + , the ionic radius is small, and Na + or Li + During the deintercalation reaction, M 1 and M 2 site rearrangement, reducing its stability during long circulation

Method used

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  • A neutral lithium-bromine flow battery
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  • A neutral lithium-bromine flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 bromine / / calcium titanium phosphate Br - / Li + dual flow battery

[0021] Single battery assembly:

[0022] (1) The structure of a single battery includes: end plates, positive and negative current collectors, positive and negative electrodes, diaphragms, liquid flow frames, positive and negative storage tanks, circulation pumps, and pipelines.

[0023] (2) The electrolyte is a mixed ion aqueous solution composed of 1.5M lithium bromide + 1.5M lithium sulfate + 1.5M MEP, and the pH value is neutral. Among them, the bromide ion is the active ion of the positive electrode, and the lithium ion can be deintercalated from the negative electrode. MEP is a positive bromine complexing agent.

[0024] (3) The negative electrode is calcium carbon phosphate carbon felt electrode. Calcium titanium phosphate, conductive agent (Super P), and binder (PVDF) were uniformly dispersed in N-methylpyrrolidone (NMP) at a mass ratio of 9:1:1, and then cast on 6mm carbon felt (...

Embodiment 2

[0031] Embodiment 2 bromine / / calcium titanium phosphate Br - / Li + Single flow battery, the battery conditions are the same as in Example 1

[0032] Battery Assembly:

[0033] Steps (1)-(5) are consistent with Experimental Example 1. Step (6) only the positive electrode electrolyte lasts, before the test,

[0034] After the negative electrode flows for 10 hours, the electrolyte pump is turned off, and the electrolyte does not flow during the test.

[0035] The test conditions of battery performance are consistent with Experimental Example 1.

Embodiment 3

[0036] Embodiment 3 bromine / / calcium titanium phosphate Br - / Na + hybrid dual flow battery,

[0037] Other conditions of experiment are the same as embodiment 1, and bromine salt and alkali metal salt are respectively NaBr and Na in the electrolytic solution 2 SO 4 , the test conditions of battery performance are consistent with Experimental Example 1.

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Abstract

The invention relates to a neutral lithium-bromine liquid flow battery. The neutral lithium-bromine flow battery is a single flow battery or a double flow battery, and the positive and negative electrolytes are the same, which are aqueous solutions containing alkali metal ion salts, salts containing bromine ions, bromine-based complexing agents and supporting electrolytes. The negative electrode active material is calcium titanium phosphate or titanium magnesium phosphate material; the positive electrode active material is an electric pair composed of bromine ions and bromine complexes, and the diaphragm is a porous ion conductive membrane. The flow battery has the advantages of high power, high voltage, high cycle stability, safety and environmental protection, and low price, and has broad application prospects in electrochemical energy storage battery technology.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a neutral lithium-bromine liquid flow battery. [0002] technical background [0003] Large-scale energy storage technology is the key to realize the efficient utilization of renewable energy. Aqueous alkali metal ion mixed flow battery is a hybrid aqueous battery composed of ion-deintercalation electrode materials and electrode materials with other reaction mechanisms. The cycle stability, energy density and power density of the battery will realize its application in large-scale energy storage technology. For example, in aqueous solution, most ion-extraction-type cathode materials have poor acid and alkali resistance, low structural stability, low reversible specific capacity, and low operating voltage, which greatly limit the cycle stability and energy density of aqueous alkali metal ion batteries. Electrochemically active couples, such as bromine-based couples, iron-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M4/86H01M4/90H01M4/96
CPCH01M4/8652H01M4/9016H01M4/9083H01M4/96H01M8/188Y02E60/50
Inventor 李先锋王怀清张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI