葡萄糖对微波水热合成正极材料LiFePO<sub>4</sub>的结构和性能的影响

doi:10.11868/j.issn.1001-4381.2016.10.010

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摘要以FeSO₄·7H₂O，LiOH·H₂O和H₃PO₄为原料，葡萄糖为改性剂，采用微波水热法合成具有正交晶系橄榄石结构的LiFePO₄/C复合材料。借助XRD，SEM，EDS和电化学性能测试等分析，研究葡萄糖对产物组成、结构、微观形貌和电化学性能的影响。结果表明：葡萄糖改性后，LiFePO₄结构中Fe，P和O原子间的结合增强，颗粒尺寸减小，表面有碳层包覆，电化学性能提高。LiFePO₄/C在0.1 C倍率下的首次放电比容量为125.6mAh/g；1.0 C倍率下的首次放电比容量为106.2mAh/g，30次循环后的容量保持率为91.3%。

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	夏傲
	于婉茹
	谈国强

关键词 ：磷酸铁锂, 正极材料, 微波水热法, 葡萄糖

Abstract：Orthorhombic LiFePO₄/C composite material with olivine structure was prepared by microwave hydrothermal method using FeSO₄·7H₂O, LiOH·H₂O and H₃PO₄ as raw materials, with glucose as carbon source and modifier. The influence of glucose on the composition, structure, morphology and electrochemical performance of LiFePO₄ was investigated by means of XRD, SEM, EDS and constant current charge-discharge cycling. The results show that the as-obtained LiFePO₄/C exhibits stronger bonding among Fe, P and O atoms, finer particle size and improved electrochemical properties than the pristine LiFePO₄. From the SEM image, the LiFePO₄ is coated by carbon in the LiFePO₄/C composite. The LiFePO₄/C shows the initial discharge capacity of 125.6mAh/g at 0.1C. Even at a rate of 1.0C, it still can deliver a discharge capacity of 106.2mAh/g, the capacity retention is 91.3% after 30 cycles.

Key words： lithium iron phosphate cathode material microwave hydrothermal method glucose

收稿日期: 2015-10-13 出版日期: 2016-10-20

中图分类号:

TB333

通讯作者: 夏傲(1981-),女,副教授,博士,研究方向:锂离子电池电极材料和铁电薄膜材料,联系地址:西安市未央区陕西科技大学材料学院(710021),E-mail:xiaao@sust.edu.cn E-mail: xiaao@sust.edu.cn

引用本文:

夏傲, 于婉茹, 谈国强. 葡萄糖对微波水热合成正极材料LiFePO₄的结构和性能的影响[J]. 材料工程, 2016, 44(10): 68-73.
XIA Ao, YU Wan-ru, TAN Guo-qiang. Effect of Glucose on Structure and Properties of LiFePO₄ Cathode Material Prepared by Microwave Hydrothermal Method. Journal of Materials Engineering, 2016, 44(10): 68-73.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.10.010 或 http://jme.biam.ac.cn/CN/Y2016/V44/I10/68

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