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您的检索式：作者名="Jaffer Saddique"
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| 1 | Sn_(4)P_(3)-induced crystalline/amorphous composite structures for enhanced sodium-ion battery anodes显示文摘The optimization of anode materials such as Sn,P and Sn4P3 in terms of capacity and cyclability is crucial to improve the overall performance of sodium-ion batteries.However,the delicate fabrication of these materials,including the balanced crystalline/amorphous domains,reasonable particle size and distribution,complementary components exhibiting synergetic reactions,among others,still greatly retards the realization of maximum performance.Herein,a series of Sn/P-based composite materials with a plum pudding configuration were fabricated to achieve controlled crystalline/amorphous structures as well as optimized size and distribution in a carbon framework.By using a facile and low-cost ball milling method,the structural transformation of Sn4P3 into phase-separated crystalline Sn and amorphous P in a carbonaceous framework can be finely controlled,producing a series of binary(Sn4 P3/C),quaternary(Sn4P3/Sn/P/C) and ternary(Sn/P/C) composites.Due to the complementary components,crystalline/amorphous adjustment,crystallite sizes and well-integrated interfaces,the quaternary Sn4P3/Sn/P/C composite showed the best electrochemical performance,with a noticeable long-cycle performance of 382 mA hg-1 and 86% capacity retention for nearly 300 cycles.Different from binary and ternary composites,the discharge of quaternary composite generates no noticeable signals of Na15Sn4 and Na3 P in the ex-situ X-ray diffraction patterns,suggesting the crystallite growth of sodiation products can be depressed.Moreover,Sn4 P3 in the quaternary composite can be partially regenerated in the desodiation reaction,implying the significant short-range interaction and thus better synergetic reactions between Sn and P components.The results demonstrate that the design and organization of crystalline/amorphous structures can serve as an efficient strategy to develop novel electrode materials for sodium ion batteries. | Jaffer Saddique Xu Zhang Tianhao Wu Heng Su Shiqi Liu Dian Zhang Yuefei Zhang Haijun Yu | 2020 | Journal of Materials Science & Technology2020，52，20： | 3 |
| 2 | Sodium-Ion Battery Anode Construction with SnP_(x)Crystal Domain in Amorphous Phosphorus Matrix显示文摘The high-capacity phosphorus-(P-)based anode materials for sodium-ion batteries(NIBs)often face poor performance retentions owing to the low conductivity and large volume expansion.It is thus essential to buffer these problems by appropriately alloying with other elements such as tin(Sn)and constructing well-designed microstructures.Herein,a series of P-/Sn-based composites have been synthesized by the facile and low-cost one-step ball milling.Pair distribution function(PDF)has been employed as a hardcore quantitative technique to elucidate their structures combined with other techniques,suggesting the formation and ratios of Sn4P3 and Sn crystalline domains embedded inside an amorphous P/carbon matrix.The composite with the largest amount of Sn4P3 in the P/C matrix can deliver the most balanced electrochemical performance,with a capacity of 422.3 mA-h g^(−1 )for 300 cycles at a current density of 1000mAg^(−1).The reaction mechanism has been elucidated by 23Na and 31P solid-state nuclear magnetic resonance(NMR)investigations.The study sheds light on the rational design and concrete identification of P-/Sn-based amorphous-dominant composite materials for NIBs. | Baixu Chen Yubo Yang Aibing Chen Xu Zhang Jaffer Saddique Mingxue Tang Haijun Yu | 2021 | Energy Material Advances2021，，1： | 1 |
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