采用超声喷雾干燥法制备磷酸铁锂粉末及其记忆效应
Preparation of LiFePO Powders by Ultrasonic Spray Drying Method and Their Memory Effect.
作者信息
Lan Tu, Guo Xiaolong, Li De, Chen Yong
机构信息
State Key Laboratory on Marine Resource Utilization in South China Sea, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, School of Materials Science and Engineering, Hainan University, Haikou 570228, China.
Guangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China.
出版信息
Materials (Basel). 2021 Jun 10;14(12):3193. doi: 10.3390/ma14123193.
The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO, but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li-Fe dislocations. This work reveals the dependence of memory effect of LiFePO on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.
锂离子电池（LIBs）的记忆效应最早在磷酸铁锂中被发现，但其起源和依赖性仍不明确，这对于调控记忆效应至关重要。在本文中，使用自制的喷雾干燥装置成功合成了平均粒径约为1μm的磷酸铁锂，并且我们研究了喷雾干燥温度对锂离子电池中磷酸铁锂记忆效应的影响。结果表明，喷雾干燥温度的升高使磷酸铁锂的记忆效应从1.3 mV增强到2.9 mV，而容量下降了约6%。X射线衍射精修和傅里叶变换红外光谱表明，记忆效应的增强可归因于锂 - 铁位错的增加。这项工作揭示了磷酸铁锂记忆效应对喷雾干燥温度的依赖性，这将指导我们优化电极材料的制备工艺并改进锂离子电池的管理系统。
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