Synthesis of LiMnPO4/C composite material for lithium ion batteries by sol-gel method
(1. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology,
Guilin 541004, China;
2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China;
3. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, China)
Guilin 541004, China;
2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China;
3. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, China)
Abstract: The LiMnPO4/C composite material was synthesized via a sol-gel method based on the citric acid. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical performance tests were adopted to characterize the properties of LiMnPO4/C. The XRD studies show that the pure olivine phase LiMnPO4 can be obtained at a low temperature of 500 °C. The SEM analyses illustrate that the citric acid used as the chelating reagent and carbon source can restrain the particle size of LiMnPO4/C well. The LiMnPO4/C sample synthesized at 500 °C for 10 h performs the highest initial discharge capacity of 122.6 mA∙h/g, retaining 112.4 mA∙h/g over 30 cycles at 0.05C rate. The citric acid based sol-gel method is favor to obtain the high electrochemical performance of LiMnPO4/C.
Key words: lithium-ion battery; cathode material; sol-gel method; LiMnPO4/C; electrochemical performance