Enhancing electrochemical energy storage capacity and rate performance of the anode with a 3D interconnected carbon tube-NiO-SnO_2 composite scaffold
Enhancing electrochemical energy storage capacity and rate performance of the anode with a 3D interconnected carbon tube-NiO-SnO_2 composite scaffold
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DOI：
10.1007/s40843-023-2526-8
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
Shiping Zhang;Fang Han;Qijun Pan;Dou Lin;Gan-Nan Chen;X. Mu;Xiaoguang Zhu;Cheng Shao;Nianqiang Wu;G. Meng
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文献类型：
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作者：
Shiping Zhang;Fang Han;Qijun Pan;Dou Lin;Gan-Nan Chen;X. Mu;Xiaoguang Zhu;Cheng Shao;Nianqiang Wu;G. Meng
二氧化锡(SnO2)具有很高的理论比容量，作为锂离子电池负极材料具有很大的潜力。然而，锡在充放电过程中不可逆地转化为SnO2，且在充放电过程中体积变化巨大，限制了电池的储能性能。在这项研究中，超细NiO和SnO2纳米颗粒(NPs)修饰在三维(3D)互联和结构集成的碳管(CT)支架上(NiO/SnO2-NPs@3D-CT)作为阳极，消除了电极中的所有非活性成分。NiO不仅贡献了容量，而且在锂化过程中被还原为Ni，催化了Li2O的分解，促进了SnO2的可逆转化。此外，3D支架的空隙可以容纳大量的NiO/SnO2纳米粒子，导致Li+在电解液和Li+宿主之间的扩散距离较短。互连的3D-CT网络充当快速电子传输通道。因此，这种独特的结构赋予了负极高的锂离子存储容量(928.5 mA h g−1,200次循环后电流密度为1 A g−1)和优异的高倍率性能；例如，即使在4 A g−1的电流密度下，也可以获得633.5 mA h g−1的可逆容量。我们相信，这种独特的集成三维结构作为LIBS的负极具有很大的前景，其应用可以进一步扩展到其他领域。
Tin dioxide (SnO2) possesses great potential as an anode material for lithium-ion batteries (LIBs) owing to its high theoretical specific capacity. However, the irreversible conversion of Sn to SnO2and enormous volume variation during the charge/discharge process limit the battery energy storage performance. In this study, ultrafine NiO and SnO2nanoparticles (NPs) decorated on a three-dimensionally (3D) interconnected and structurally integrated carbon tube (CT) scaffold (NiO/SnO2-NPs@3D-CT) is developed as an anode, eliminating any inactive component in the electrode. The NiO not only contributes to the capacity but also undergoes reduction to Ni during the lithiation process, which catalyzes Li2O decomposition and facilitates the reversible conversion of Sn to SnO2. Additionally, the open space of the 3D scaffold can host a large number of NiO/SnO2NPs and results in a short diffusion distance of Li+between the electrolyte and the Li+host. The interconnected 3D-CT network serves as a fast electron transport channel. Consequently, the unique structure endows the anode with high Li-ion storage capacity (928.5 mA h g−1at a current density of 1 A g−1after 200 cycles) and superior high-rate performance; for instance, a reversible capacity of 633.5 mA h g−1can be achieved even at a current density of 4 A g−1. We believe that the unique, integrated 3D structure holds great promise as an anode for LIBs and that its applications can be further extended to other fields.