C-LiFePO<sub>4</sub>/聚三苯胺复合锂离子电池正极材料的制备与性能

引用本文: 苏畅, 黄启飞, 徐立环, 张诚. C-LiFePO₄/聚三苯胺复合锂离子电池正极材料的制备与性能[J]. 物理化学学报, 2014, 30(1): 88-94. doi: 10.3866/PKU.WHXB201311072 shu

Citation: SU Chang, HUANG Qi-Fei, XU Li-Huan, ZHANG Cheng. Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, 2014, 30(1): 88-94. doi: 10.3866/PKU.WHXB201311072 shu

C-LiFePO₄/聚三苯胺复合锂离子电池正极材料的制备与性能

苏畅 ^1, ,
黄启飞 ^1, ,
徐立环 ^2, ,
张诚 ^1,

基金项目:
国家自然科学基金(51003095，51103132) (51003095，51103132)

浙江省公益性技术应用研究计划(2010C31121)资助项目 (2010C31121)

摘要:

通过低温溶剂热法和高温热处理技术合成了橄榄石结构的LiFePO₄/carbon (C-LiFePO₄)纳米材料. 在此基础上，通过溶液共混法制备了一种新型的聚三苯胺(PTPAn)修饰包覆的C-LiFePO₄复合锂离子电池正极材料(C-LiFePO₄/PTPAn). 利用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、电化学阻抗谱(EIS)以及恒电流充放电等测试方法，考察PTPAn 包覆量对C-LiFePO₄/PTPAn 复合正极材料性能的影响. 结果表明：通过溶液共混法PTPAn能够致密地包覆在C-LiFePO₄表面，形成一个有效的电子/离子传输通道从而有效提高CLiFePO₄基复合材料的电化学活性. 所有样品中C-LiFePO₄/10% (w) PTPAn作为正极材料呈现出最佳的电化学性能，在0.1C倍率恒流充放电下材料首次放电比容量为154.5 mAh·g^-1，在10C高倍率恒流充放电下材料的放电比容量达到114.2 mAh·g^-1. 当C-LiFePO₄/PTPAn 复合材料表面包覆的PTPAn 含量进一步增加，复合材料的电化学性能出现下降的趋势. 电化学阻抗测试表明PTPAn包覆层明显减小了C-LiFePO₄电极的电荷转移电阻.

关键词:

English

Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries

1.
1 State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
2 College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China
Received Date: 06 August 2013
Available Online: 01 January 2014
Fund Project:
国家自然科学基金(51003095，51103132)

浙江省公益性技术应用研究计划(2010C31121)资助项目

Abstract:

An olivine LiFePO₄/carbon (C-LiFePO₄) nanocrystallinematerial was prepared using a low-temperature solvothermalmethod, followed by a high-temperature post-annealing process. Then polytriphenylamine (PTPAn)-modified C-LiFePO₄ (C-LiFePO₄/PTPAn) was prepared, as a composite for novel cathodes for lithium-ion batteries, by solution blending of the C-LiFePO₄ nanocrystallinematerial and the electroactive conducting polymer PTPAn. The effects of PTPAn coating of the C-LiFePO₄/PTPAn samples were investigated using X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electronmicroscopy (TEM), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge testing. The results indicated that the solution blending method produced a compact PTPAn coating on the C-LiFePO₄, providing an effective electronic/ionic conducting pathway and enhancing the electrochemical activities of C-LiFePO₄-based composites. The C-LiFePO₄/10%(w) PTPAn electrode displayed an improved initial discharge capacity of 154.5mAh·g^-1 at 0.1C, a superior high-rate performance discharge capacity of 114.2 mAh·g^-1 at 10C, and excellent cycling stability.With further increases in the PTPAn content of the coating on the C-LiFePO₄/PTPAn composite, the electrochemical properties of the composite decreased. Electrochemical impedance measurements also demonstrated that the PTPAn coating significantly decreased the charge-transfer resistance of the C-LiFePO₄ electrode.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

C-LiFePO₄/聚三苯胺复合锂离子电池正极材料的制备与性能

English

Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

C-LiFePO4/聚三苯胺复合锂离子电池正极材料的制备与性能

English

Preparation and Performances of C-LiFePO4/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

C-LiFePO₄/聚三苯胺复合锂离子电池正极材料的制备与性能

Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs