共沉淀中热力学耦合对正极材料电化学性能的影响

doi:10.12068/j.issn.1005-3026.2022.06.011

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (6): 835-843.DOI: 10.12068/j.issn.1005-3026.2022.06.011

共沉淀中热力学耦合对正极材料电化学性能的影响

赵赫^1,2，高宣雯^1,2，李建中^1,2，丁学勇²

(1. 东北大学多金属共生矿生态化冶金教育部重点实验室，辽宁沈阳110819; 2. 东北大学冶金学院，辽宁沈阳110819)

修回日期:2021-07-26 接受日期:2021-07-26 发布日期:2022-07-01
通讯作者: 赵赫
作者简介:赵赫(1993- )，男，河南许昌人，东北大学博士研究生；李建中(1976- )，男，辽宁沈阳人，东北大学教授，博士生导师.
基金资助:
国家重点研发计划项目( 2019YFE0123900)；国家自然科学基金资助项目(51974069).

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:-
Supported by:
-

摘要/Abstract

摘要： 以共沉淀法制备钠离子层状氧化物正极材料NaNi_0.4Mn_0.4Fe_0.2O₂，采用Al³⁺有效控制和平衡共沉淀反应的过程.考察了加入Al元素带来的热力学耦合效应及对正极材料电化学性能的影响.结果表明，在Mn²⁺，Ni²⁺和Fe²⁺离子共存的环境中，由于Al³⁺更高的过饱和度和更负的吉布斯自由能变(ΔG)所产生的热力学耦合效应，显著改变了溶液离子之间的沉淀驱动力，加速Ni²⁺和Mn²⁺的沉淀并抑制Fe³⁺的沉淀.Na［Ni_0.4Mn_0.4Fe_0.2］_0.995Al_0.005O₂正极材料表现出优异的电化学性能，这归因于引入Al³⁺制备得到高质量的前驱体(［0.4MnCO₃·0.4NiCO₃·0.2Fe(OH)₃］_0.995·0.005Al(OH)₃).

关键词: 耦合效应;层状氧化物;钠离子电池;共沉淀;前驱体

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

中图分类号:

TQ152

赵赫，高宣雯，李建中，丁学勇. 共沉淀中热力学耦合对正极材料电化学性能的影响[J]. 东北大学学报（自然科学版）, 2022, 43(6): 835-843.

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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共沉淀中热力学耦合对正极材料电化学性能的影响

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

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