不同碳源合成Na2MnPO4F/C及其作为锂离子电池正极材料的性能

doi:10.3866/PKU.WHXB201306181

Abstract

Abstract:

Na₂MnPO₄F/C composites were synthesized by wet ball milling and in situ pyrolytic carbon coating. Stearic acid, citric acid, poly(ethylene glycol) 6000, and β-cyclodextrin were used as carbon sources in the synthesis process. The structures, morphologies, and electrochemical performances of the as-synthesized Na₂MnPO₄F/C composites were further investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller surface area analysis, and galvanostatic chargedischarge tests. Distinct differences were observed in the morphologies and sizes of the Na₂MnPO₄F/C particles obtained from different carbon sources, and this significantly affected their electrochemical performances. It was found that the primary particle size of the Na₂MnPO₄F/C material is a key factor in the electrochemical performance. The sample synthesized using citric acid as the carbon source had a micro-nano structure, with the smallest primary particle size of 10-40 nm, and displayed the best electrochemical properties. It delivered an initial discharge capacity of 80 mAh·g^-1 under a current density of 5 mA·g^-1 in the voltage range of 1.5-4.8 V, and displayed good cycling performance.

Key words: Lithium ion battery, Cathode, Na₂MnPO₄F/C, Carbon source, Morphology

ZHONG Yan-Jun, LI Jun-Tao, WU Zhen-Guo, ZHONG Ben-He, GUO Xiao-Dong, HUANG Ling, SUN Shi-Gang. Synthesis of Na₂MnPO₄F/C with Different Carbon Sources and Their Performances as Cathode for Lithium Ion Battery[J]. Acta Phys. -Chim. Sin. 2013, 29(09), 1989-1997. doi: 10.3866/PKU.WHXB201306181

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Synthesis of Na₂MnPO₄F/C with Different Carbon Sources and Their Performances as Cathode for Lithium Ion Battery

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Synthesis of Na₂MnPO₄F/C with Different Carbon Sources and Their Performances as Cathode for Lithium Ion Battery