Effect of Sc3+ doping on lithium storage performance of Li3V2(PO4)3/C cathode material synthesized by carbothermal reduction method
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摘要: 通过碳热还原法成功制备出Sc3+掺杂Li3V2(PO4)3/C正极材料。系统研究了Sc3+掺杂量对Li3V2(PO4)3的结构、形貌及电化学性能的影响。Sc3+掺杂虽然没有改变Li3V2(PO4)3的晶格类型,但是使得Li3V2(PO4)3的晶格膨胀,晶胞体积增大,有利于电子传输和Li+扩散。此外,Sc3+掺杂使得不规则的多边形块状Li3V2(PO4)3颗粒球化并减小其尺寸。更为重要的是,合适的Sc3+掺杂量能显著增强Li3V2(PO4)3正极材料的电子电导率和Li+扩散系数。得益于适当的Sc3+掺杂量以及碳包覆和多孔结构,Li3V1.85Sc0.15(PO4)3/C样品具有优异的储锂性能,其在10 C的高倍率下可提供84.8 mAh/g的首次放电比容量,并且循环100圈后容量保持率高达93.5%。
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关键词:
- Li3V2(PO4)3 /
- Sc3+掺杂 /
- 碳热还原法 /
- 储锂性能 /
- 放电比容量
Abstract: In this paper, Sc3+ doped Li3V2(PO4)3/C cathode material was successfully prepared by carbothermal reduction method. The effects of Sc3+ doping amount on the structure, morphology and lithium storage properties of Li3V2(PO4)3 were systematically investigated. Although Sc3+ doping does not change the lattice type of Li3V2(PO4)3, it makes the lattice of Li3V2(PO4)3 expand and the unit cell volume increase, which is beneficial to electron transport and Li+ diffusion. In addition, Sc3+ doping makes irregular polygonal Li3V2(PO4)3 particles spheroidized and reduces the particle size. More importantly, the appropriate doping amount of Sc3+ can significantly enhance the electronic conductivity and Li+ diffusion coefficient of Li3V2(PO4)3 cathode material. Benefiting from the appropriate Sc3+ doping amount, carbon coating and porous structure, Li3V1.85Sc0.15(PO4)3/C samples possess superior lithium storage properties. The initial discharge specific capacity is 84.8 mAh/g at 10 C rate, and the capacity retention rate is as high as 93.5 % after 100 cycles. -
表 1 单斜Li3V2−xScx(PO4)3/C样品精修后的晶格参数和对应的晶胞体积(a,b,c和β:单斜晶系的晶胞参数;V:晶胞体积)
Table 1. Refined lattice parameters of monoclinic Li3V2−xScx(PO4)3/C materials and the corresponding unit-cell volumes (a, b, c and β : unit-cell parameters of the monoclinic system; V : volume of unit-cell)
样品 a /nm b /nm c /nm β /° V /nm3 Li3V2(PO4)3/C 0.860 1 0.859 5 1.203 90.55 0.889 6 Li3V1.90Sc0.05(PO4)3/C 0.860 8 0.860 2 1.203 90.52 0.891 0 Li3V1.85Sc0.15(PO4)3/C 0.8613 0.860 7 1.205 90.51 0.893 1 Li3V1.80Sc0.20(PO4)3/C 0.862 1 0.861 7 1.206 90.48 0.895 6 -
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