煅烧条件对水热反萃法合成LiFePO<sub>4</sub>/C的影响

摘要

为了合成锂离子电池正极材料LiFePO₄/C，设计开发了一种水热反萃法制备LiFePO₄/C的方法，并重点研究了煅烧温度和时间对LiFePO₄/C的结构、形貌及其电化学性能的影响。分别运用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、恒电流充放电、循环伏安（CV）等测试手段对样品进行了表征。电化学测试结果表明：在煅烧温度为650℃，煅烧时间为4 h的情况下，LiFePO₄/C的电化学性能较好。在0.1、0.2、0.5和1.0 C下，其首次放电比容量分别达到151.7、154.8、149.8和139.1 mAh·g^-1。除此之外，它还具有良好的容量保持率和循环性能。

	Service

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	Email Alert
	RSS
	作者相关文章
	祖雪敏
	李丹丹
	陈莉
	王兴尧

关键词：锂离子电池正极材料 LiFePO₄/C 水热反萃法电化学性能

Abstract：

In order to synthesize lithium-ion battery cathode material LiFePO₄/C, a hydrothermal stripping method was designed to synthesize LiFePO₄/C cathode materials. The influences of sintering temperatures and time on the structure, morphology and electrochemical performances of LiFePO₄/C were investigated. The structure and morphology of samples were characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM). The electrochemical performances were conducted by galvanostatic charge/discharge test and cyclic voltammetry (CV). The electrochemical results show that LiFePO₄ sintered at 650℃ for 4 h exhibits good electrochemical performance. The LiFePO₄/C sample presents the discharge capacity of 151.7 mAh·g^-1,154.8 mAh·g^-1, 149.8 mAh·g^-1 and 139.1 mAh·g^-1 at 0.1 C, 0.2 C, 0.5 C and 1 C, respectively. In addition, the LiFePO₄/C also shows excellent capacity retention and cycle performances.

Keywords： lithium-ion battery； cathode material； LiFePO₄/C； hydrothermal stripping method； electrochemical performance

Received 2016-01-07;

Fund:

国家自然科学基金（21276185）。

Corresponding Authors: 王兴尧,E-mail:wxyghw@tju.edu.cn。 Email: wxyghw@tju.edu.cn

About author: 祖雪敏(1990-),女,硕士研究生,现从事锂离子电池正极材料方面的研究。

引用本文:

祖雪敏, 李丹丹, 陈莉, 王兴尧.煅烧条件对水热反萃法合成LiFePO₄/C的影响[J]. 化学工业与工程, 2017,34(6): 6-10

Zu Xuemin, Li Dandan, Chen Li, Wang Xingyao.Influence of Sintering Conditions on Performances of LiFePO₄/C Cathode Material Obtained by Hydrothermal Stripping Method[J]. Chemcial Industry and Engineering, 2017,34(6): 6-10

[1] Tian L, Chen L. Liquid-Phase preparation electrochemical property of LiFePO₄/C nanowires[J]. Journal of Central South University of Technology, 2014, 21(2):477-481
[2] Chen C, Liu G, Wang Y, et al. Preparation and electrochemical properties of LiFePO₄/C nanocomposite using FePO₄·2H₂O nanopaticles by introduction of Fe₃(PO₄)₂·8H₂O at low cost[J]. Electrochimica Acta, 2013, 113:464-469
[3] 田建华, 李向军, 位辰先, 等. LiFePO₄/C复合材料的制备和性能[J]. 化学工业与工程, 2007, 24(1):1-4 Tian Jianhua, Li Xiangjun, Wei Chenxian, et al. Preparation and properties of LiFePO₄/C composite material[J]. Chemical Industry and Engineering, 2007, 24(1):1-4(in Chinese)
[4] Deng S, Wang H, Liu H, et al. Research Progress in improving the rate performance of LiFePO₄ cathode materials[J]. Nano-Micro Letters. 2014, 6(3):209-226
[5] Hu Y, Ren J, Wei Q, et al. Synthesis of rod-like LiFePO₄/C materials with different aspect ratios by polyol process[J]. Acta Phys-Chim Sin, 2014, 30(1):75-82
[6] Miao C, Bai P, Jiang Q, et al. A novel synthesis and characterization of LiFePO₄ and LiFePO₄/C as a cathode material for lithium-ion battery[J]. Journal of Power Sources, 2014, 246:232-238
[7] Muxina K, Izumi T. Synthesis of carbon-coated LiFePO₄ nanoparticles with high rate performance in lithium secondary batteries[J]. Journal of Power Sources 2010, 195(11):3661-3667
[8] Li L, Li X, Wang Z, et al. Stable cycle-life properties of Ti-doped LiFePO₄ compounds synthesized by co-precipitation and normal temperature reduction method[J]. Journal of Physics and Chemistry of Solids, 2009, 70(1):238-242
[9] Peng W, Jiao L, Gao H, et al. A novel sol-gel method based on FePO₄·2H₂O to synthesize submicrometer structured LiFePO₄/C cathode material[J]. Journal of Power Sources, 2011, 196(5):2841-2847
[10] 徐峙晖,赖琼玉,吉晓阳. 用碳热还原法合成LiFePO₄及其电化学性能研究[J]. 四川大学学报:工程科学版, 2005, 37(4):77-80 Xu Zhihui, Lai Qiongyu, Ji Xiaoyang. LiFePO₄ synthesized by carbonthermal reduction and the study of electrochemical performance[J]. Journal of Sichuan University:Engineering Science, 2005, 37(4):77-80(in Chinese)
[11] Vadivel M A, Muraliganth T, Manthiram A. Rapid microwave-solvothermal synthesis of phospho-olivine nanorods and their coating with a mixed conducting polymer for lithium ion batteries[J]. Electrochemistry Communications. 2008, 10:903-906
[12] Franger S, Lecras F, Bourbon C, et al. LiFePO₄ synthesis routes for enhanced electrochemical performance[J]. Electrochemical and Solid State Letter, 2002, 5(10):A231-A233
[13] Zhu B, Li X, Wang Z, et al. Novel synthesis of LiFePO₄ by aqueous precipitation and carbothermal reduction[J]. Materials Chemistry and Physics. 2006, 98(2):373-376
[14] Park K S, Son T J, Chung H T, et al. Synthesis of LiFePO₄ by co-precipitation and microwave heating[J]. Electrochemistry Communications, 2003, 5(10):839-842