Citation: NIE Ping, SHEN Lai-Fa, CHEN Lin, SU Xiao-Fei, ZHANG Xiao-Gang, LI Hong-Sen. Sol-Gel Synthesis and Electrochemical Performance of Porous LiMnPO₄/MWCNT Composites[J]. Acta Physico-Chimica Sinica, ;2011, 27(09): 2123-2128. doi: 10.3866/PKU.WHXB20110902 shu

Sol-Gel Synthesis and Electrochemical Performance of Porous LiMnPO₄/MWCNT Composites

1.
1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, P. R. China;
2. College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

Received Date: 23 May 2011
Available Online: 1 July 2011
Fund Project: 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) (20873064) 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(BCXJ11-10)资助 (BCXJ11-10)

Porous LiMnPO₄ and LiMnPO₄/MWCNT (multi-walled carbon nanotube) composites were prepared using a citric acid assisted sol-gel method. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), nitrogen adsorption-desorption isotherms (BET), and transmission electron microscopy (TEM) were performed to characterize their morphologies and structures. The results indicated that fine-sized, well-crystallized olivine LiMnPO₄ was synthesized. The interlaced carbon nanotube networks were intimately embedded and incorporated into the porous LiMnPO₄ particle to form highlyconductive three-dimensional (3D) networks. The LiMnPO₄ particle and LiMnPO₄/MWCNT composite had rich hierarchical pores. A detailed analysis showed that the average pore size was in the mesoporous range and specific surface areas of 73.7 and 69.9 m2·g^-1 were obtained, respectively. Compared with the LiMnPO₄ particle the LiMnPO₄/MWCNT composite exhibited much higher specific capacity. When discharged at a rate of 0.05C and 2C the capacities were 108.8 and 33.2 mAh·g^-1, respectively. The MWCNT effectively improved the electronic conductivity of the hybrid materials as shown by electrochemical impedance spectroscopy (EIS). The improved electrochemical performance of the LiMnPO₄/MWCNT electrode is attributed to the enhanced electrical conductivity caused by the tighter binding of the carbon nanotubes with the LiMnPO₄ primary particles as well as by the interconnected open pores with a high surface area.
- Lithium manganese phosphate,
- Carbon nanotube,
- Porous material,
- Sol-gel method,
- Lithium ion battery
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Sol-Gel Synthesis and Electrochemical Performance of Porous LiMnPO4/MWCNT Composites

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通讯作者: 陈斌, bchen63@163.com

Sol-Gel Synthesis and Electrochemical Performance of Porous LiMnPO₄/MWCNT Composites