Method for recovering vanadium redox battery capacity

A vanadium redox flow battery and capacity technology, which is applied in the direction of regenerative fuel cells, etc., can solve the problems of electrolyte unusable and electrolyte imbalance, and achieve the effect of low cost, less usage and simple operation

Inactive Publication Date: 2016-07-06
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

[0005] Due to the cross-linking of vanadium ions and the continuous occurrence of side reactions, after a long-term operation of the battery, the vanadium ions in the negative electrode electrolyte may be mainly V 2+ , the vanadium ions in the positive electrolyte are mainly VO 2+ , resulting in an imbalance of the electrolyte in the positive and negative electrodes, and the electrolyte cannot continue to be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After long-term use of charge and discharge, the capacity decay of the negative electrode electrolyte of the flow battery is used as the raw material. The divalent vanadium ion in the negative electrode electrolyte is 1.0mol / L, the trivalent vanadium ion is 0.2mol / L, and the electrolyte volume is 100mL . In the process of electrolyte flow, add 8 grams of potassium permanganate to the negative storage tank and react for 2 hours. The battery capacity is restored to 90% of the initial capacity. The recovered electrolyte is tested by the charging and discharging platform. The coulombic efficiency is 94.3%. The efficiency is 85.2%, and the energy efficiency is 80.3%.

Embodiment 2

[0021] After long-term charging and discharging use, the capacity decay of the negative electrode electrolyte of the flow battery is used as the raw material. The divalent vanadium ion in the negative electrode electrolyte is 0.5mol / L, the trivalent vanadium ion is 1.0mol / L, and the electrolyte volume is 100mL . In the process of electrolyte flow, add 4 grams of potassium permanganate to the negative storage tank and react for 2 hours. The battery capacity is restored to 92.4% of the initial capacity. The recovered electrolyte is tested on a charging and discharging platform. The coulombic efficiency is 95.4%. The efficiency is 86.3%, and the energy efficiency is 82.3%.

Embodiment 3

[0023] After long-term use of charge and discharge, the capacity decay of the negative electrode electrolyte of the flow battery is used as the raw material. The divalent vanadium ion in the negative electrode electrolyte is 1.0mol / L, the trivalent vanadium ion is 0.2mol / L, and the electrolyte volume is 100mL . In the process of electrolyte flow, 560mL of oxygen was injected into the negative electrode tank and reacted for 2 hours. The battery capacity was restored to 85% of the initial capacity. The recovered electrolyte was tested on a charging and discharging platform. The coulombic efficiency was 93.8% and the voltage efficiency was 87.1. %, the energy efficiency is 81.7%.

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Abstract

The invention relates to a method for recovering a vanadium redox battery capacity. One or more of an organic oxidizing agent and an inorganic oxidizing agent are added into a vanadium redox battery negative electrode electrolyte as a raw material and divalent vanadium ions in the oxidizing agents and the negative electrode electrolyte undergo an oxidation reaction so that divalent vanadium ions are oxidized to form trivalent vanadium ions and a battery capacity is recovered. Through use of an appropriate oxidizing agent in the negative electrode electrolyte, divalent vanadium accumulation in battery operation is avoided, capacity attenuation is finally avoided and long-term operation of the battery and high efficiency utilization of the electrolyte are realized. The method has simple processes, can be operated simply, utilizes easily available raw materials and has a low cost and substantial effects.

Description

Technical field [0001] The present invention relates to the field of flow battery application and energy recovery, in particular to a method for restoring the capacity of the negative electrode electrolyte of a flow battery and its application. Background technique [0002] The all-vanadium flow battery is a new type of energy storage system. Compared with the traditional energy storage method, it has the characteristics of fast charge and discharge response, large and adjustable charge capacity, high battery efficiency, and simple battery structure. In particular, the fixed storage of renewable energy has outstanding advantages. The positive and negative electrolyte solutions of the all-vanadium redox flow battery contain solutions of V(Ⅴ) / V(Ⅳ) and V(Ⅲ) / V(Ⅱ) vanadium compounds. It is not only an active material for energy storage, but also a complete solution. The core of energy storage and energy conversion of vanadium flow battery. The following reactions occur during the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 孙佳伟张华民李先锋赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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