喷雾干燥法制备氟掺杂钴酸锂正极材料及其电化学性能研究
Preparation of fluorine-doped LiCoO? cathode material by spray drying method and its electrochemical performance research
郭紫峰 1张吉亮1
作者信息
- 1. 大连交通大学材料科学与工程学院，大连 116028
- 折叠
摘要
本文针对高电压条件下钴酸锂正极材料结构不稳定及循环性能衰减的问题，采用喷雾干燥结合高温煅烧方法制备氟掺杂钴酸锂材料，并系统分析其结构与电化学性能。结果表明，所得样品均保持典型R-3m层状结构且无明显杂相，精修结果显示晶格参数略有增大；同时材料形貌均匀，元素分布良好。电化学测试结果表明，掺杂样品在2.8-4.6V范围内具有更优的循环稳定性和倍率性能，容量保持率显著提高；电化学阻抗降低，表明界面反应动力学得到改善；dQ/dV进一步表明，高电压区间的相变行为受到有效抑制。综上，喷雾干燥法可实现均匀掺杂并优化材料结构稳定性与电化学性能，为高能量密度钴酸锂正极材料的制备提供了一种新的有效途径。
Abstract
This article addresses the issues of structural instability and cycling performance degradation of LiCoO2 cathode materials under high voltage conditions. A method combining spray drying and high-temperature calcination is employed to prepare fluorine-doped LiCoO2 materials, and a systematic analysis of their structure and electrochemical performance is conducted. The results indicate that the obtained samples maintain a typical R-3m layered structure without evident impurities, and refinement results show a slight increase in lattice parameters. Additionally, the material exhibits uniform morphology and good element distribution. Electrochemical testing reveals that the doped samples demonstrate superior cycling stability and rate performance within the 2.8-4.6V range, with a significant improvement in capacity retention. The electrochemical impedance decreases, indicating improved interface reaction kinetics. Further analysis via dQ/dV suggests that phase transition behavior in the high voltage range is effectively suppressed. In summary, spray drying enables uniform doping and optimizes the structural stability and electrochemical performance of materials, providing an effective approach for the preparation of high energy density LiCoO2 cathode materials.In this paper关键词
锂离子电池/正极材料/掺杂改性/喷雾干燥Key words
Lithium-ion battery/Cathode material/Doping modification/Spray drying引用本文复制引用
郭紫峰,张吉亮.喷雾干燥法制备氟掺杂钴酸锂正极材料及其电化学性能研究[EB/OL].(2026-04-07)[2026-04-10].http://www.paper.edu.cn/releasepaper/content/202604-53.学科分类
能源动力工业经济
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