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Surface Modification of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 by V2O5- Coating
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Surface Modification of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 by V2O5- Coating
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    摘要:

    在采用低溫共沉淀-水熱-煅燒法合成鋰離子電池Fe-Ni-Mn體系正極材料Li1.6(Fe0.2Ni0.2Mn0.6)O2.6的基礎上，對合成的材料Li1.6(Fe0.2Ni0.2Mn0.6)O2.6進行V2O5的包覆改性研究，以提高材料Li1.6(Fe0.2Ni0.2Mn0.6)O2.6的首次放電比容量和循環(huán)性能。用XRD、SEM、TEM、ICP光譜和恒流充放電測試研究包覆材料的結構和電化學性能。結果表明，V2O5包覆并沒有改變材料的晶體結構，只存在于材料的表面，與未包覆的材料相比，V2O5包覆后的材料具有更好的首次放電容量和容量保持率。50周循環(huán)后，添加質量分數(shù)3%V2O5樣品Li1.6(Fe0.2Ni0.2Mn0.6)O2.6的放電比容量可以維持在200.3 mAh/g，大于未添加V2O5樣品Li1.6(Fe0.2Ni0.2Mn0.6)O2.6的194.0 mAh/g。CV測試表明，包覆層的存在有效抑制了材料層狀結構的轉變及電極與電解液的負反應

    Abstract:

    We presented a method to improve the first discharge capacity and the cycling performance of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 which was synthesized by a coprecipitation-hydrothermal-calcinations method and coated by a V2O5 layer on the surface of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6. The crystal structure and the charge/discharge performance of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), inductively coupled plasma (ICP) and electrochemical performance measurement. Results show that V2O5 exists only on the surface, and has no effect on the crystal structure; the Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 coated with V2O5 exhibits better first discharge capacity than the bared Li1.6(Fe0.2Ni0.2Mn0.6)O2.6. The electrochemical tests demonstrate that Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 coated with 3 wt% V2O5 shows the best electrochemical performance with the discharge capacity 200.3 mAh/g after 50 cycles, while the bared sample has 194.0 mAh/g only. CV results indicate that the V2O5 coating can suppress the phase transitions and prevent the surface of cathode materials from the direct contact with the electrolyte

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王秋艷,徐連義,張艷麗,王曉明,謝 嫚. Surface Modification of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 by V2O5- Coating[J].稀有金屬材料與工程,2014,43(3):530~534.[Wang Qiuyan, Xu Lianyi, Zhang Yanli, Wang Xiaoming, Xie Man. Surface Modification of Li1.6(Fe0.2Ni0.2Mn0.6)O2.6 by V2O5- Coating[J]. Rare Metal Materials and Engineering,2014,43(3):530~534.]
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  • 收稿日期:2013-03-25
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  • 在線發(fā)布日期: 2014-06-27
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