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Neutral lithium-bromine flow battery

A liquid flow battery and flow battery technology, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of small ionic radius and reduced stability of long cycle process

Active Publication Date: 2020-06-23
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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  • Neutral lithium-bromine flow battery
  • Neutral lithium-bromine flow battery
  • 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 a calcium carbon phosphate carbon felt electrode. Calcium titanium phosphate, conductive agent (Super P), and binder (PVDF) were uniformly dispersed in N-methylpyrrolidone (NMP) in a mass ratio of 9:1:1, and then poured on 6mm carbon fe...

Embodiment 2

[0031] Example 2 Bromine / / Calcium Titanium Phosphate Br - / Li + Single flow battery, battery conditions are the same as in Example 1

[0032] Battery Assembly:

[0033] Steps (1)-(5) are the same as in Experimental Example 1. Step (6) only the positive electrolyte continues, 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 the battery performance are the same as those of Experimental Example 1.

Embodiment 3

[0036] Example 3 Bromine / / Calcium Titanium Phosphate Br - / Na + Hybrid dual flow battery,

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

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Abstract

The invention relates to a neutral lithium-bromine flow battery. The neutral lithium-bromine flow battery is a single-flow battery or a double-flow battery, the positive electrolyte and the negative electrolyte are the same and are both aqueous solutions containing alkali metal ion salt, bromide ion salt, a bromine-based complexing agent and a supporting electrolyte, and the negative active substance is a titanium calcium phosphate or titanium magnesium phosphate material; the positive active substance is an electric pair composed of bromide ions and a bromine complex, and the diaphragm is a porous ion conduction membrane. The flow battery has the advantages of high power, high voltage, high cycling stability, safety, environmental protection and low price, and has a wide application prospect in an 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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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