具有优越储锂性能的Sb@Sb_2O_3/还原氧化石墨烯复合材料的简易制备（英文）
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摘要
锑基材料被认为是制备锂离子电池最具应用前景的负极材料之一,然而复杂而成本昂贵的制备过程严重限制了其应用。本文采用一锅化学还原的简便方法在室温下得到Sb@Sb_2O_3/还原氧化石墨烯(Sb@Sb_2O_3/rGO)复合材料。XRD和TGA结果表明,复合材料中Sb和Sb_2O_3的质量分数分别为34.0%和26.6%。将该复合材料用作锂离子电池电极材料使用时,在200mA/g电流密度下循环200次后可逆比容量仍保持在790.9 mA?h/g,容量保持率高达93.8%;在2000 mA/g电流密度下充放电时仍有260mA?h/g的可逆比容量。优越的电化学性能得益于所制备复合材料良好的纳米结构,尺寸约为10 nm的Sb和Sb_2O_3颗粒通过电子耦合作用牢牢地锚定在还原氧化石墨烯片层上。该结构既能有效缓冲因储锂过程中产生体积膨胀而引起的应力作用,还可抑制Sb和Sb_2O_3纳米颗粒的团聚,更能提高活性材料的导电性。
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@Sb_2O_3/reduced graphene oxide(Sb@Sb_2O_3/r GO) 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 Sb_2O_3 in the Sb@Sb_2O_3/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 Sb_2O_3 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 Sb_2O_3 particles, but also improve the electron transfer ability during cycling.
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@Sb_2O_3/reduced graphene oxide(Sb@Sb_2O_3/r GO) 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 Sb_2O_3 in the Sb@Sb_2O_3/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 Sb_2O_3 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 Sb_2O_3 particles, but also improve the electron transfer ability during cycling.
引文
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[26]HERNáNDEZ-RENTERO C,VARGA O,CABALLERO A,MORALES J,MARTíN F.Solvothermal-induced 3Dgraphene networks:Role played by the structural and textural properties on lithium storage[J].Electrochimica Acta,2016,222:914-920.DOI:10.1016/j.electacta.2016.11.057.
[27]XU Xin,SI Ling,ZHOU Xiao-si,TU Feng-zhang,ZHUXiao-shu,BAO Jian-chun.Chemical bonding between antimony and ionic liquid-derived nitrogen-doped carbon for sodium-ion battery anode[J].Journal of Power Sources,2017,349:37-44.DOI:10.1016/j.jpowsour.2017.03.026.
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