共沉淀法制备LiNi1-x-yCoxMnyO2正极材料工艺条件探究

doi:10.11949/j.issn.0438-1157.20171308

化工学报 ›› 2018, Vol. 69 ›› Issue (1): 175-187.DOI: 10.11949/j.issn.0438-1157.20171308

共沉淀法制备LiNi_1-x-yCo_xMn_yO₂正极材料工艺条件探究

耿淑君¹, 黄青山^1,2, 朱全红¹, 金永成¹, 杨超^1,2

1 中国科学院青岛生物能源与过程研究所, 山东青岛 266101;
2 中国科学院过程工程研究所, 中国科学院绿色过程与工程重点实验室, 北京 100190

收稿日期:2017-09-27 修回日期:2017-11-20 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: 杨超
基金资助:
国家重点研发计划项目（2016YFB0301701）；国家自然科学基金项目（91434114，21376254）；中国科学院科研装备研制项目（YZ201641）。

Investigation on synthesis conditions of LiNi_1-x-yCo_xMn_yO₂ cathode material via co-precipitation

GENG Shujun¹, HUANG Qingshan^1,2, ZHU Quanhong¹, JIN Yongcheng¹, YANG Chao^1,2

1 Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China;
2 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2017-09-27 Revised:2017-11-20 Online:2018-01-05 Published:2018-01-05
Contact: 10.11949/j.issn.0438-1157.20171308
Supported by:
supported by the National Key Research and Development Program of China (2016YFB0301701), the National Natural Science Foundation of China (91434114, 21376254) and the Instrument Developing Project of the Chinese Academy of Sciences (YZ201641).

摘要/Abstract

摘要：

共沉淀法可高效、低能耗制备出较高纯度的球形层状LiNi_1-x-yCo_xMn_yO₂正极材料，广泛应用于基础研究和工业生产中，主要包括液相共沉淀及高温煅烧过程。对这两个过程中涉及的机理进行了阐述，并分析相关影响因素，考察了共沉淀制备前体这个关键步骤中颗粒成核过程以及Ni、Co、Mn 3种金属离子发生的络合及沉淀反应。通过建立的反应和热力学平衡方程，分析未沉淀的3种金属离子及其相互之间比值随pH和氨水加入量的二维变化，首次定量得出制备所需Ni、Co、Mn配比三元正极材料的理论最佳条件。此外，从前体及正极材料的结构特性以及最终材料的电化学活性出发，定性探究了最优操作条件。最后，展望了三元正极材料工艺条件优化的科学方法。

关键词: LiNi_1-x-yCo_xMn_yO₂, 正极材料, 颗粒过程, 共沉淀, 制备, 热力学, 高温煅烧

Abstract:

Layer-structured spherical cathode material, LiNi_1-x-yCo_xMn_yO₂, with high purity can be prepared by co-precipitation with high efficiency and low energy consumption. This method has been widely applied in both fundamental research and industrial production, mainly including co-precipitation and high-temperature calcination processes. The mechanisms and influence factors involved in each procedure were elaborated and analyzed. The nucleation process and the complexation and precipitation reactions of Ni, Co and Mn ions were investigated in the key step of co-precipitation for the preparation of precursor. Based on the established equilibrium equations of reactions and thermodynamics, the two-dimensional variations of the three non-precipitated metal concentrations and their mutual ratios for different pH and amounts of NH₃ were thoroughly analyzed. Through the analysis results, theoretical optimum conditions for the cathode material with desired metal-ion ratios were thus proposed for the first time. In addition, by means of analyzing the structural characteristics of the precursor and cathode material as well as the electrochemical activity of the final material, the proper operation conditions were qualitatively investigated. Finally, the scientific method for optimizing the process conditions of LiNi_1-x-yCo_xMn_yO₂ cathode material was prospected.

Key words: LiNi_1-x-yCo_xMn_yO₂, cathode material, particulate processes, co-precipitation, preparation, thermodynamics, calcination

中图分类号:

TQ031.2

耿淑君, 黄青山, 朱全红, 金永成, 杨超. 共沉淀法制备LiNi_1-x-yCo_xMn_yO₂正极材料工艺条件探究[J]. 化工学报, 2018, 69(1): 175-187.

GENG Shujun, HUANG Qingshan, ZHU Quanhong, JIN Yongcheng, YANG Chao. Investigation on synthesis conditions of LiNi_1-x-yCo_xMn_yO₂ cathode material via co-precipitation[J]. CIESC Journal, 2018, 69(1): 175-187.

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共沉淀法制备LiNi_1-x-yCo_xMn_yO₂正极材料工艺条件探究

Investigation on synthesis conditions of LiNi_1-x-yCo_xMn_yO₂ cathode material via co-precipitation

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