Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (3): 460-466.doi: 10.3866/PKU.WHXB201401074

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Electrochemical Characterization of Nano-LiMnPO4

YANG Wen-Chao1,2, BI Yu-Jing2, YANG Bang-Cheng2, WANG De-Yu2, SHI Si-Qi1   

  1. 1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, P. R. China;
    2 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang Province, P. R. China
  • Received:2013-12-06 Revised:2014-01-06 Published:2014-02-27
  • Contact: SHI Si-Qi E-mail:sqshi@shu.edu.cn
  • Supported by:

    The project was supported by the Qianjiang Talent Project of Zhejiang Province, China (2012R10078), Cooperation ofWuhan and Chinese Academy of Sciences (20120216), and National Natural Science Foundation of China (51372228).

Abstract:

Nano-LiMnPO4 samples were synthesized via a two-step heating polyol method. The role of the first thermal plateau temperature T1 (T1=100, 110, 120, 130, 140, 150 ℃) on the physical and electrochemical properties of the samples was investigated. Their structures and morphologies were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2 sorption measurements. All samples at different plateau temperatures exhibited a sheet structure. At T1=100-120 ℃, samples contained some impurities, and their specific surface areas were <15 m2·g-1. Pure nano-LiMnPO4 was obtained at T1=130 ℃, and exhibited the largest specific surface area (46.3 m2·g-1). The specific surface areas of samples remained at 35-37 m2·g-1 with further increase in T1. The electrochemical performance of the nano-LiMnPO4 samples followed the same trend as their specific surface areas. Nano-LiMnPO4 at T1=130 ℃ exhibited the best electrochemical performance, with a discharge capacity of 129 mAh·g-1 at 0.1C rate and 81 mAh·g-1 at 5C rate. This indicated that the specific surface area is one of the key factors in determining the electrochemical performance of LiMnPO4.

Key words: Lithium-ion battery, Cathode material, Nano-LiMnPO4, Specific surface area, Polyol method

MSC2000: 

  • O646