石墨烯掺杂LiFePO<sub>4</sub>电极材料的合成及其电化学性能

引用本文: 徐科, 申来法, 米常焕, 张校刚. 石墨烯掺杂LiFePO₄电极材料的合成及其电化学性能[J]. 物理化学学报, 2012, 28(01): 105-110. doi: 10.3866/PKU.WHXB201228105 shu

Citation: XU Ke, SHEN Lai-Fa, MI Chang-Huan, ZHANG Xiao-Gang. Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials[J]. Acta Physico-Chimica Sinica, 2012, 28(01): 105-110. doi: 10.3866/PKU.WHXB201228105 shu

石墨烯掺杂LiFePO₄电极材料的合成及其电化学性能

基金项目:
国家重点基础研究发展计划项目(973) (2007CB209703) (973) (2007CB209703)

国家自然科学基金(20873064, 21173120, 21103090) (20873064, 21173120, 21103090)

江苏省普通高校科研创新计划(CXZZ11_0204) (CXZZ11_0204)

南京航空航天大学博士学位论文创新与创优基金资助(BCXJ11-10) (BCXJ11-10)

摘要: 采用水热辅助法合成石墨烯改性的LiFePO₄多孔微球电极材料. 并对材料进行了X射线衍射(XRD), 扫描电子显微镜(SEM), 透射电子显微镜(TEM), 傅里叶变换红外(FT-IR)光谱, 充放电等表征. 从结果可以看出在2 mol·L^-1 LiNO₃电解液体系中单纯包碳的LiFePO₄微球在1C、50C倍率时的比容量分别为137、64 mAh·g^-1,而石墨烯改性的LiFePO₄微球的比容量分别为141、105 mAh·g^-1, 表现出较好的倍率特性. 恒流循环充放电测试60 次后两种材料容量保持率分别为70.2%、83.7%. 说明掺杂石墨烯构成的三维导电网络能明显改善LiFePO₄的电化学性能.

关键词:

LiFePO₄
/ 石墨烯
/ 水热法
/ 锂离子电池

English

Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials

1.
College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
Received Date: 26 July 2011
Available Online: 29 December 2011
Fund Project:
国家重点基础研究发展计划项目(973) (2007CB209703)

国家自然科学基金(20873064, 21173120, 21103090)

江苏省普通高校科研创新计划(CXZZ11_0204)

南京航空航天大学博士学位论文创新与创优基金资助(BCXJ11-10)

Abstract: Graphene-modified mesoporous LiFePO₄ microsphere composites were synthesized by a hydrothermal method and subsequent annealing. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and galvanostatic charge-discharge techniques were used to characterize the morphology, structure and electrochemical performance of the resulting composites. The graphene-modified LiFePO₄ microspheres exhibited a high discharge capacity of 141 mAh·g^-1 at 1C, and 105 mAh·g^-1 at 50C, while LiFePO₄/C only delivered 137 mAh·g^-1 at 1C, 64 mAh·g^-1 at 50C in an aqueous electrolyte of 2 mol·L^-1 LiNO₃. The graphene-modified LiFePO₄ exhibited excellent cyclability compared with LiFePO₄/C, with a capacity retention of about 83.7% after 60 cycles versus about 70.2% for LiFePO₄/C. The improved electrochemical performance is attributed to the formation of a three-dimensional (3D) graphene network.

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

石墨烯掺杂LiFePO₄电极材料的合成及其电化学性能

English

Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

石墨烯掺杂LiFePO4电极材料的合成及其电化学性能

English

Synthesis and Electrochemical Performance of Graphene Modified LiFePO4 Cathode Materials

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

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石墨烯掺杂LiFePO₄电极材料的合成及其电化学性能

Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials

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