ELECTROREDUCTION OF NICKEL(II) CHLORIDE, COBALT(II) FLUORIDE AND MOLYBDENUM(VI) OXIDE MIXTURES IN A HEAT ACTIVATED BATTERY

O. V. Volkova; Волкова О. В.; V. V. Zakharov; Захаров В. В.; S. V. Pershina; Першина С. В.; B. D. Antonov; Антонов Б. Д.; A. A. Pankratov; Панкратов А. А.

doi:10.31857/S0235010623050110

ELECTROREDUCTION OF NICKEL(II) CHLORIDE, COBALT(II) FLUORIDE AND MOLYBDENUM(VI) OXIDE MIXTURES IN A HEAT ACTIVATED BATTERY

Authors: Volkova O.V.¹, Zakharov V.V.¹, Pershina S.V.¹, Antonov B.D.¹, Pankratov A.A.¹
Affiliations:
1. Institute of High-Temperature Electrochemistry of the Ural Branch of RAS
Issue: No 5 (2023)
Pages: 540-549
Section: Articles
URL: https://journals.rcsi.science/0235-0106/article/view/141799
DOI: https://doi.org/10.31857/S0235010623050110
EDN: https://elibrary.ru/YUNHEQ
ID: 141799

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Abstract

The discharge characteristics of the elements of a thermally activated chemical current source (HAB) containing NiCl₂–CoF₂–MoO₃ mixtures as a positive electrode are investigated. It is established that molybdenum oxide stabilizes the discharge plateau and increases the discharge voltage at temperatures above 530°C. The discharge curve has a stepwise character. The number of steps of the discharge curve is determined by the operating conditions of HAB. The low-voltage stage (less than 0.4 V) corresponds to the reduction of lithium molybdates, which are formed by the interaction of molybdenum oxide with the reduction products of transition metal halides. A study of the cathode reduction products by the methods of XRD, STA and SEM was carried out. It is established that during the discharge of the HAB element, the initial components of the cathode mixture are restored to metals that form a dendritic matrix. The DSC curves of the salt fraction formed during electrochemical reactions have a number of thermal effects corresponding to the temperatures of joint melting of a triple mixture of lithium halides LiF–LiCl–LiBr and eutectic dual systems LiF–LiCl, LiCl–Li₂O, in which transition metal halides and lithium molybdates are dissolved.

Keywords

heat activated battery, cathode, cobalt fluoride, nickel chloride, molybdenum oxide

References

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