Mg doped Li2FeSiO4/C nanocomposites synthesized by the solvothermal method for lithium ion batteries,Dalton Transactions

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Mg doped Li2FeSiO4/C nanocomposites synthesized by the solvothermal method for lithium ion batteries
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-09-04 00:00:00 , DOI: 10.1039/c7dt03177g
Ajay Kumar _{1,

2,

3,

4} , O. D. Jayakumar _{5,

6,

7} , Jagannath Jagannath _{5,

6,

7} , Parisa Bashiri _{1,

2,

3,

4} , G. A. Nazri _{1,

2,

3,

4} , Vaman. M. Naik _{4,

8,

9,

10} , Ratna Naik _{1,

2,

3,

4}

Affiliation

A series of porous Li₂Fe_1−xMg_xSiO₄/C (x = 0, 0.01, 0.02, 0.04) nanocomposites (LFS/C, 1Mg-LFS/C, 2Mg-LFS and 4Mg-LFS/C) have been synthesized via a solvo-thermal method using the Pluronic P123 polymer as an in situ carbon source. Rietveld refinement of the X-ray diffraction data of Li₂Fe_1−xMg_xSiO₄/C composites confirms the formation of the monoclinic P2₁ structure of Li₂FeSiO₄. The addition of Mg facilitates the growth of impurity-free Li₂FeSiO₄ with increased crystallinity and particle size. Despite having the same percentage of carbon content (∼15 wt%) in all the samples, the 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity of 278 mA h g⁻¹ (∼84% of the theoretical capacity) at the C/30 rate and also exhibited the best rate capability and cycle stability (94% retention after 100 charge–discharge cycles at 1C). This is attributed to its large surface area with a narrow pore size distribution and a lower charge transfer resistance with enhanced Li-ion diffusion coefficient compared to other nanocomposites.

中文翻译：

溶剂热法合成锂离子电池镁掺杂Li ₂ FeSiO ₄ / C纳米复合材料

一系列多孔的Li ₂ Fe _{1- x} Mg _x SiO ₄ / C（x = 0、0.01、0.02、0.04）纳米复合材料（LFS / C，1Mg-LFS / C，2Mg-LFS和4Mg-LFS / C）具有使用Pluronic P123聚合物作为原位碳源，通过溶剂热法合成了碳纳米管。Li ₂ Fe ₁₋_x Mg _x SiO ₄ / C复合材料的X射线衍射数据的Rietveld精炼证实了Li ₂ FeSiO ₄的单斜晶P 2 ₁结构的形成。Mg的添加促进了具有增加的结晶度和粒径的无杂质的Li ₂ FeSiO ₄的生长。尽管所有样品中的碳含量百分比相同（约15 wt％），但1Mg-LFS / C纳米复合材料在C温度下仍具有278 mA hg ^-1的最高初始放电容量（约为理论容量的84％）。 / 30倍率，还表现出最佳的倍率能力和循环稳定性（在1C下100次充放电循环后保留率达94％）。与其他纳米复合材料相比，这归因于其较大的表面积和较窄的孔径分布，以及较低的电荷转移阻力和增强的锂离子扩散系数。

更新日期：2017-09-20

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