Coupling Effects of Thermodynamics in Co-precipitation on Electrochemical Performance of Cathode Materials

doi:10.12068/j.issn.1005-3026.2022.06.011

Journal of Northeastern University(Natural Science) ›› 2022, Vol. 43 ›› Issue (6): 835-843.DOI: 10.12068/j.issn.1005-3026.2022.06.011

• Materials & Metallurgy • Previous Articles Next Articles

Coupling Effects of Thermodynamics in Co-precipitation on Electrochemical Performance of Cathode Materials

ZHAO He^1,2， GAO Xuan-wen^{1, 2}， LI Jian-zhong^{1, 2}， DING Xue-yong²

1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores， Ministry of Education， Northeastern University， Shenyang 110819， China; 2. School of Metallurgy， Northeastern University， Shenyang 110819， China.

Revised:2021-07-26 Accepted:2021-07-26 Published:2022-07-01
Contact: LI Jian-zhong
About author:-
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Abstract

Abstract: The sodium ion layered oxide cathode material NaNi_0.4Mn_0.4Fe_0.2O₂ was synthesized by the co-precipitation method， and Al³⁺was used to effectively control and balance the co-precipitation reaction process. The thermodynamic coupling effect brought by the addition of Al element and its influence on electrochemical performance of cathode materials were investigated. In an environment where Mn²⁺， Ni²⁺ and Fe³⁺ ions coexist， owing to the thermodynamic coupling effect， the superior high supersaturation of Al³⁺ and the more negative change in the Gibbs free energy(ΔG)can efficiently changes the precipitation driving force between the solution ions， accelerating the precipitation of Ni²⁺and Mn²⁺ ions and inhibiting the precipitation of Fe³⁺ ions. The obtained Na［Ni_0.4Mn_0.4Fe_0.2］_0.995Al_0.005O₂ cathode material has demonstrated excellent electrochemical performance which can be attributed to the high quality precursor(［0.4MnCO₃·0.4NiCO₃·0.2Fe(OH)₃］_0.995·0.005Al(OH)₃) brought about by the introduction of Al³⁺.

Key words: coupling effects; layered oxide; sodium ion battery; co-precipitation; precursor

CLC Number:

TQ152

ZHAO He， GAO Xuan-wen ， LI Jian-zhong ， DING Xue-yong. Coupling Effects of Thermodynamics in Co-precipitation on Electrochemical Performance of Cathode Materials[J]. Journal of Northeastern University(Natural Science), 2022, 43(6): 835-843.

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Coupling Effects of Thermodynamics in Co-precipitation on Electrochemical Performance of Cathode Materials

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