Sandwich nanostructured LiMnPO₄/C as enhanced cathode materials for lithium-ion batteries

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• 作者：Xudong Hu ; Xiaohong Sun ; Ming Yang ; Huiming Ji ; Xiaolei Li…
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：52
• 期：7
• 页码：3597-3612
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
• 出版者：Springer US
• ISSN：1573-4803
• 卷排序：52

文摘

An alternate nanosheet/nanoparticle sandwich nanostructured LiMnPO₄ cathode material is successfully synthesized by solvothermal process using oleic acid as the chelating agent. The size of the nanoparticles is as small as ca. 20 nm, which is important to avoid the agglomeration of the nanosheets from overlapping. The carbon-coated LiMnPO₄ cathode delivers discharge capacities of 164.9 mAh g−1 at 0.05 C, 159.6 mAh g−1 at 0.1 C, 142.5 mAh g−1 at 0.2 C, and even 77.6 mAh g−1 at 5 C rates, which values are obviously better than those of the counterparts of pure nanosheets. The rate capability and cycle life tests indicate that the sandwich nanostructured LiMnPO₄/C cathode material also exhibits an excellent rate and cycle performance. The scanning electron microscopy, transmission electron microscopy, and N₂ adsorption–desorption results confirm that the sandwich nanostructured LiMnPO₄ with better dispersibility, higher surface area, and broader mesoporous distribution is beneficial to achieve the uniform post carbon-coating morphology and result in the improved electrochemical property. The enhanced electrochemical performances of sandwich nanostructured LiMnPO₄/C electrode have also been verified by the electrochemical impedance spectra and electron energy loss spectroscopy.