纳米LiFePO<sub>4</sub>/C复合材料的制备和性能*

doi:10.11901/1005.3093.2014.328

材料研究学报

2014, Vol. 28

Issue (12): 949-954 DOI: 10.11901/1005.3093.2014.328

本期目录 | 过刊浏览

纳米LiFePO₄/C复合材料的制备和性能*

秦显忠¹,杨改²,马烽¹(

),蔡飞鹏²,胡素琴²

1. 齐鲁工业大学化学与制药工程学院济南 250353
2. 山东省科学院能源研究所山东省生物质气化技术重点实验室济南 250014

Synthesis and Properties of Nano-LiFePO₄/C Composites

Xianzhong QIN¹,Gai YANG²,Feng MA^1,^**(

),Feipeng CAI²,Suqin HU²

1. Institute of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353
2. Key Laboratory of Biomass Gasification Technology, Shandong Institute of Energy Sciences, Jinan 250014

引用本文:

秦显忠,杨改,马烽,蔡飞鹏,胡素琴. 纳米LiFePO₄/C复合材料的制备和性能*[J]. 材料研究学报, 2014, 28(12): 949-954.
Xianzhong QIN, Gai YANG, Feng MA, Feipeng CAI, Suqin HU. Synthesis and Properties of Nano-LiFePO₄/C Composites[J]. Chinese Journal of Materials Research, 2014, 28(12): 949-954.

全文: PDF(3448 KB) HTML

摘要:

以Fe(NO₃)₃9H₂O、H₃PO₄和稀氨水为原料, 用控制结晶法制备FePO₄xH₂O, 研究了表面活性剂CTAB和PEG对FePO₄xH₂O材料的影响。再以Li₂CO₃、蔗糖和高温烧结后的FePO₄为原料用碳热还原法制备了纳米LiFePO₄/C复合材料。用SEM、XRD、充放电测试、循环伏安测试等手段对该复合材料进行表征, 研究其电化学性能。结果表明: 添加表面活性剂制备的LiFePO₄/C复合材料纳米颗粒呈球形且团聚减少, 提高了材料的倍率性能和循环性能, 其中添加CTAB制备的LiFePO₄/C材料的颗粒最小、分散性较好, 0.1C时的首次放电比容量为159.8 mAhg^-1, 10C倍率下比容量仍达到132.4 mAhg^-1。

关键词 ：复合材料, 控制结晶法, 表面活性剂, 碳热还原法, 磷酸铁锂

Abstract：

FePO₄·H₂O precursor was synthesized by the co-precipitation method from raw materials Fe (NO₃)₃·9H₂O, H₃PO₄ and NH₃·H₂O, which then was modified by surfactants hexadecyl trim ethyl ammonium bromide (CTAB) and polyethylene glycol (PEG). Finally LiFePO₄ /C composites were synthesized with the as-prepared FePO₄·2H₂O, Li₂CO₃ and sucrose as raw materials. The LiFePO₄ /C composites were characterized by means of X-ray diffractormeter (XRD) and scanning electron microscope (SEM). Their performance was determined by cyclic voltammograms (CV) and electrochemical measurement.. The results show that the presence of surfactants CTAB and PEG may be beneficial to suppressing the agglomeration of the particles of the composites; thereby their electrochemical properties were enhanced. The LiFePO₄/C particles synthesized with surfactant CTAB modified FePO₄2H₂O exhibit excellent dispersive ability with particle mean size 170nm and excellent cycle performance and rate properties i.e. a discharge specific capacity 159.8 mAhg^-1 at 0.1C as well as a value higher than 132.4 mAhg^-1 even at 10C.

Key words： composites surfactants controlled crystallization method carbon thermal reduction lithium iron phosphate

收稿日期: 2014-07-06

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.328 或 https://www.cjmr.org/CN/Y2014/V28/I12/949

图1 预处理后FePO4的XRD谱图

图2 LiFePO4的XRD谱图

图3 FePO4前驱体粉末的SEM像

图4 合成LiFePO4/C的SEM像

图5 0.1 C倍率下合成的LiFePO4 /C的首次放电曲线

图6 LiFePO4/C材料在不同倍率下的恒流放电比容量-循环曲线

图7 LiFePO4/C材料在不同倍率下的恒流放电电压-循环曲线

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