A method for restoring battery capacity in situ

A technology of battery capacity and capacity, applied in the direction of secondary battery repair/maintenance, etc., can solve problems such as capacity attenuation, and achieve the effect of restoring capacity, easy availability of raw materials, and low energy consumption

Active Publication Date: 2016-01-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for restoring battery capacity, solve the problem of capacity attenuation during battery operation, and realize the reuse and recovery of battery electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The vanadium battery cathode electrolyte that has lost 95% of its capacity is used as the raw material. The pentavalent vanadium ion in the cathode electrolyte is 1.24mol / L, the tetravalent vanadium ion is 0.06mol / L, and the volume of the cathode electrolyte is 110ml. During the flow of the electrolyte, 9 grams of oxalic acid was added to the positive electrode liquid storage tank. After 16 hours of reaction, the battery capacity recovered to 85.3% of the original capacity. After the recovered electrolyte was charged and discharged, the coulombic efficiency was 92.5%, the energy efficiency was 79%, and the voltage efficiency was 73%.

Embodiment 2

[0021] The vanadium battery cathode electrolyte that has lost 50% of its capacity is used as the raw material. The pentavalent vanadium ion in the cathode electrolyte is 0.6mol / L, the tetravalent vanadium ion is 0.6mol / L, and the volume of the cathode electrolyte is 110ml. During the flow of the electrolyte, add 5 grams of oxalic acid to the positive electrode storage tank. After 9 hours of reaction, the battery capacity recovered to 87.1% of the original capacity. After the recovered electrolyte was tested by charge and discharge, the coulombic efficiency was 93%, the energy efficiency was 77%, and the voltage efficiency was 71.1%.

Embodiment 3

[0023] The vanadium battery cathode electrolyte that has lost 95% of its capacity is used as the raw material. The pentavalent vanadium ion in the cathode electrolyte is 1.24mol / L, the tetravalent vanadium ion is 0.06mol / L, and the volume of the cathode electrolyte is 110ml. During the flow of the electrolyte, 18 grams of sodium sulfite was added to the positive storage tank. After 16 hours of reaction, the battery capacity recovered to 77% of the original capacity. After the recovered electrolyte was tested by charge and discharge, the coulombic efficiency was 92.4%, the energy efficiency was 75%, and the voltage efficiency was 69.3%.

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Abstract

The invention relates to the field of battery application and energy restoration, in particular to a method for restoring battery capacity in situ. The method comprises the following steps: after a long-term charge-discharge use, taking positive electrolyte of a vanadium battery with a fading capacity as a raw material, adding an organic, inorganic or composite reductant into the positive electrolyte, and performing reduction reaction on the reductant and pentavalent vanadium ions in the positive electrolyte so as to reduce the pentavalent vanadium ions into tetravalent vanadium ions and restore the battery capacity. By adding a proper proportion of organic-inorganic reductant into the positive electrolyte, the capacity fading problem in a running process of the battery is solved and recycle of the battery electrolyte is achieved; and the method is simple in process, easy to operate, easy to obtain the raw material and obvious in effect.

Description

technical field [0001] The invention relates to the field of battery application and energy recovery, in particular to a method for recovering battery capacity in situ. Background technique [0002] Vanadium redox flow battery, referred to as vanadium battery. It is a new type of electrochemical energy storage system. Compared with traditional storage batteries, it has the characteristics of fast charging and discharging, large capacity, low self-discharging rate and simple battery structure. It is suitable for large-scale storage of new energy such as wind energy and solar energy. ideal form of power supply. The positive and negative electrolytes of vanadium batteries contain VO 2+ / VO 2 + with V 2+ / V 3+ The sulfuric acid solution of the redox couple is not only a conductive medium, but also an electroactive material for energy storage, and is the core of vanadium battery energy storage and energy conversion. The working principle of the vanadium battery is that dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 秦野何虹祥张博王利娟刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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