氟化钠对Li1.3Ni0.14Mn0.68Co0.07O2正极材料的电化学性能的影响

doi:10.16039/j.cnki.cn22-1249.2019.03.019

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摘要

采用不同浓度氟化钠溶液处理自制的Li_1.3Ni_0.14Mn_0.68Co_0.07O₂材料，制备了系列处理样。通过X射线衍射仪、扫描电镜、红外光谱、交流阻抗、循环伏安和充放电循环等方法研究了样品的物相结构及电化学性能。结果表明，Li_1.3Ni_0.14Mn_0.68Co_0.07O₂与氟化钠摩尔比为1: 1.50条件下制备的处理样品的电化学性能最优。在2.5~4.6V电压区间和1C倍率电流下，未处理和经处理样品第1循环的放电容量分别为71 mAh/g和128.6 mAh/g，第30循环的放电容量分别为173.9 mAh/g和193.3 mAh/g。处理样品的阻抗明显减小，样品表层价键有所增强，从而改善了样品的电化学性能。

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	祖国晶
	李秀华
	余欣瑞
	郭可可
	生瑜
	童庆松

关键词: 固溶体氟化钠 Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ 放电性能

Abstract:

A series of treated samples prepared by using the as-prepared Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ and sodium fluoride solution with various concentration. X-ray powder diffraction, scanning electron microscopy, infrared spectrum, Electrochemical impedance, cyclic voltammograms and charge-discharge tests were employed to investigate the structure and electrochemical performance of the treated samples. The results show that the treated optimal sample exhibits the best electrochemical performance among all samples while the molar ratio of Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ to sodium fluoride is 1: 1.5. In the voltage range of 2.5 to 4.6V and 1C rate, the discharge capacity of the untreated and treated optimal sample exhibits the 1st cycle capacity of 71 and 128.6 mAh/g, respectively; and the 30th cycle capacity of 173.9 and 193.3 mAh/g. The charge-transfer resistance and polarization of the optimal sample significantly decreased, and the Ni-O，Co-O and Mn-O bond on the surface of the treated optimal sample enhanced, thereby the electrochemical performance of the sample improved.

Key words: solid solution sodium fluoride Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ discharge performance

出版日期: 2019-03-25 发布日期: 2019-03-25 整期出版日期: 2019-03-25

ZTFLH:

O657.32

引用本文:

祖国晶, 李秀华, 余欣瑞, 郭可可, 生瑜, 童庆松. 氟化钠对Li_1.3Ni_0.14Mn_0.68Co_0.07O₂正极材料的电化学性能的影响 [J]. 吉林化工学院学报, 2019, 36(3): 92-96.
ZU Guojin, LI Xiuhua, YU Xinrui, GUO Keke, SHENG Yu, TONG Qingsong. Electrochemical Performance of Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ Cathode Treated by using a Sodium Fluoride Solution . Journal of Jilin Institute of Chemical Technology, 2019, 36(3): 92-96.

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http://xuebao.jlict.edu.cn/CN/10.16039/j.cnki.cn22-1249.2019.03.019 或 http://xuebao.jlict.edu.cn/CN/Y2019/V36/I3/92

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