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首页> 外文期刊>RSC Advances >Synergistic lithium storage of a multi-component Co2SnO4/Co3O4/Al2O3/C composite from a single-source precursor
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Synergistic lithium storage of a multi-component Co2SnO4/Co3O4/Al2O3/C composite from a single-source precursor

机译：来自单一来源前体的多组分Co2SnO4 / Co3O4 / Al2O3 / C复合材料的协同锂存储

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摘要

Endowing multi-component anode nanomaterials for lithium-ion batteries (LIBs) with integrated features for synergistically enhancing electrochemical performance is challenging via a simple preparation method. We herein describe an easy approach for preparing a multi-component Co2SnO4/Co3O4/Al2O3/C composite as the anode nanomaterial for LIBs, derived froma laurate anion-intercalated CoAlSn-layered double hydroxide (CoAlSn-LDH) single-source precursor. The resultant Co2SnO4/Co3O4/Al2O3/C electrode delivers a highly enhanced reversible capacity of 1170 mA h g(-1) at 100 mA g(-1) after 100 cycles, compared with the bi-active composites designed without Al2O3 or carbon (Co2SnO4/Co3O4/C, Co2SnO4/Co3O4/Al2O3, and Co2SnO4/Co3O4) which are easily derived through the same protocol by choosing LDH precursors without Al cation or surfactant intercalation. The distinctly different cycling stability and rate capability of Co2SnO4/Co3O4/Al2O3/C among the different composite electrodes suggest that the high enhancement could result from the following synergistic features: the combined conversion and alloying reactions of bi-active Co2SnO4/Co3O4 during cycling, the buffering role of non-active Al2O3 and carbon, and the improved conductivity of the self-generated carbon matrix. The LDH precursor-based approach may be extended to the design and preparation of various multi-component transition metal oxide composite nanomaterials for synergistic lithium storage.
机译：通过简单的制备方法，赋予锂离子电池（LIBs）具有集成功能以协同增强电化学性能的多组分阳极纳米材料是具有挑战性的。我们在本文中描述了一种简单的方法，用于制备多组分Co2SnO4 / Co3O4 / Al2O3 / C复合材料，作为LIB的阳极纳米材料，其衍生自月桂酸酯阴离子插层的CoAlSn层状双氢氧化物（CoAlSn-LDH）单源前体。与不含Al2O3或碳（Co2SnO4）的双活性复合材料相比，在100个循环后，所得的Co2SnO4 / Co3O4 / Al2O3 / C电极在100 mA g（-1）下可提供1170 mA hg（-1）的高可逆容量。 / Co3O4 / C，Co2SnO4 / Co3O4 / Al2O3和Co2SnO4 / Co3O4）可以通过选择没有Al阳离子或表面活性剂嵌入的LDH前体通过相同的方案轻松获得。不同复合电极之间Co2SnO4 / Co3O4 / Al2O3 / C的循环稳定性和速率能力明显不同，这表明该增强作用可能来自以下协同特征：双活性Co2SnO4 / Co3O4在循环过程中的组合转化和合金化反应，非活性Al2O3和碳的缓冲作用，以及自生碳基质的电导率提高。基于LDH前体的方法可以扩展到用于协同锂存储的各种多组分过渡金属氧化物复合纳米材料的设计和制备。

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