Method for the in-situ recalibration of a comparison electrode incorporated into an electrochemical system

A technique for comparing electrodes and recalibrating, applied in the field of electrochemical systems, which can solve problems such as danger, voltage measurement drift, and component degradation

Active Publication Date: 2016-08-17
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] However, electrodes based on coating materials (for example made of LTO (lithium titanate) or LFP (lithium iron phosphate) or alloys) age over time in a manner accelerated by the temperature, which causes a more or less rapid Voltage measurement drift
[0034] Due to this drift, measurements of the positive and negative electrode potentials will be erroneous over time, and exploitation derived from these measurements will result in operating the battery in an incorrect Components are degraded (overcharged, overdischarged) and potentially dangerous (overcharged)

Method used

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  • Method for the in-situ recalibration of a comparison electrode incorporated into an electrochemical system
  • Method for the in-situ recalibration of a comparison electrode incorporated into an electrochemical system
  • Method for the in-situ recalibration of a comparison electrode incorporated into an electrochemical system

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Embodiment Construction

[0072] Figure 1a The electrochemical system shown comprises a working electrode 1 , a counter electrode 2 and a comparison electrode 3 all immersed in an electrolyte 4 . Electrolyte 4 may be liquid or solid. The voltage ΔU available during discharge depends on the difference between the potentials U+ and U- at the terminals of the working and counter electrodes. It can also be found that the potentials U+ and U− at the terminals of the working and counter electrodes are measured relative to the comparison electrode 3 . Figure 1b The evolution of the potential of the working electrode and of the counter electrode as a function of the state of charge and discharge of the accumulator, as well as the state of oxidation or reduction of these electrodes is shown in itself.

[0073] Embodiments of the invention will now be described that relate to an in situ recalibration method of a comparison electrode (EDC) integrated in an electrochemical system. The technology involved is mo...

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Abstract

A method for the in-situ recalibration of a comparison electrode (3) incorporated into an electrochemical system comprising a working electrode (1), a counter electrode (2) and an electrolyte (4), characterised by the fact that it comprises the following steps: checking the potential of the comparison electrode (3), detecting if there is a drift in the potential of the comparison electrode (3) relative to the potential plateau for which it has been designed, and, if this is the case, recalibrating the comparison electrode (3).

Description

technical field [0001] The technical field of the invention relates to electrochemical systems, and more particularly to electrochemical systems having three electrodes, including a comparative electrode. Background technique [0002] The electrochemical system consists of at least a working electrode and a counter electrode immersed in an electrolyte and separated by a separator. A third electrode, whose potential is stable and known, can be added to such a system, which enables independent measurement of the potential of each electrode during the redox reaction. This third electrode is considered as a reference electrode (EDR) when the electrochemical potential obtained by the Nernst equation (équation de Nernst) (cf. Eq. 2) does not change with time. When having Ox Ref / Red Ref This stabilization is possible when the activity of the species of the electrochemical pair does not change over time. [0003] The electrochemical reactions capable of converting oxidized spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48H01M10/42H01M6/50G01N27/30H01M10/052
CPCG01N27/301H01M10/052H01M10/48H01M6/5005H01M2010/4271G01N27/4163Y02E60/10
Inventor S·热涅斯M·阿利亚S·莱伦斯A·Z·基尔舍瓦
Owner RENAULT SA
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