High-capacity anode materials are highly desirable for sodium ion batteries. Here, a porous Sb/Sb2O3 nanocomposite is successfully synthesized by the mild oxidization of Sb nanocrystals in air. In the composite, Sb co...High-capacity anode materials are highly desirable for sodium ion batteries. Here, a porous Sb/Sb2O3 nanocomposite is successfully synthesized by the mild oxidization of Sb nanocrystals in air. In the composite, Sb contributes good conductivity and Sb2O3 improves cycling stability, particularly within the voltage window of 0.02-1.5 V. It remains at a reversible capacity of 540 mAh-g-1 after 180 cycles at 0.66 A-g-1. Even at 10 A-g-1, the reversible capacity is still preserved at 412 mAh·g-1, equivalent to 71.6% of that at 0.066 A.g-L These results are much better than Sb nanocrystals with a similar size and structure. Expanding the voltage window to 0.02-2.5 V includes the conversion reaction between Sb203 and Sb into the discharge/charge profiles. This would induce a large volume change and high structure strain、stress, deteriorating the cycling stability. The identification of a proper voltage window for Sb/Sb2O3 paves the way for its development in sodium ion batteries.展开更多
目的研究压粉法制备微型Sb/Sb2O3全固态pH电极,克服玻璃电极的不足。方法压粉法制备Sb/Sb2O3固体pH电极,利用扫描电子显微镜、X射线衍射研究电极表面成分分布与特征,利用电位法、循环伏安法、断电流法对所制备的电极性能进行研究评价。...目的研究压粉法制备微型Sb/Sb2O3全固态pH电极,克服玻璃电极的不足。方法压粉法制备Sb/Sb2O3固体pH电极,利用扫描电子显微镜、X射线衍射研究电极表面成分分布与特征,利用电位法、循环伏安法、断电流法对所制备的电极性能进行研究评价。结果该电极的有效成分均匀分布于电极表面,电极活化时间小于200 s。在pH值为1.0~5.0范围内有良好的线性响应,其响应斜率为-32.87 m V/pH。该电极具有良好的抗离子干扰能力和可逆性,循环伏安测试证实了该电极的电极反应,将该电极应用于溶液pH值的测量,与玻璃电极相比误差约为0.05,满足测量的需求。结论利用压粉法成功制备了Sb/Sb2O3固体pH电极。展开更多
Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/re...Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.展开更多
文摘High-capacity anode materials are highly desirable for sodium ion batteries. Here, a porous Sb/Sb2O3 nanocomposite is successfully synthesized by the mild oxidization of Sb nanocrystals in air. In the composite, Sb contributes good conductivity and Sb2O3 improves cycling stability, particularly within the voltage window of 0.02-1.5 V. It remains at a reversible capacity of 540 mAh-g-1 after 180 cycles at 0.66 A-g-1. Even at 10 A-g-1, the reversible capacity is still preserved at 412 mAh·g-1, equivalent to 71.6% of that at 0.066 A.g-L These results are much better than Sb nanocrystals with a similar size and structure. Expanding the voltage window to 0.02-2.5 V includes the conversion reaction between Sb203 and Sb into the discharge/charge profiles. This would induce a large volume change and high structure strain、stress, deteriorating the cycling stability. The identification of a proper voltage window for Sb/Sb2O3 paves the way for its development in sodium ion batteries.
文摘目的研究压粉法制备微型Sb/Sb2O3全固态pH电极,克服玻璃电极的不足。方法压粉法制备Sb/Sb2O3固体pH电极,利用扫描电子显微镜、X射线衍射研究电极表面成分分布与特征,利用电位法、循环伏安法、断电流法对所制备的电极性能进行研究评价。结果该电极的有效成分均匀分布于电极表面,电极活化时间小于200 s。在pH值为1.0~5.0范围内有良好的线性响应,其响应斜率为-32.87 m V/pH。该电极具有良好的抗离子干扰能力和可逆性,循环伏安测试证实了该电极的电极反应,将该电极应用于溶液pH值的测量,与玻璃电极相比误差约为0.05,满足测量的需求。结论利用压粉法成功制备了Sb/Sb2O3固体pH电极。
基金Project(51462032)supported by the National Natural Science Foundation of ChinaProject(17JR5RA066)supported by the Foundation for Distinguished Young Scholars of Gansu Province,China
文摘Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.
