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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Hierarchical hollow microspheres assembled from N-doped carbon coated Li4Ti5O_(12) nanosheets with enhanced lithium storage properties
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Hierarchical hollow microspheres assembled from N-doped carbon coated Li4Ti5O_(12) nanosheets with enhanced lithium storage properties

机译：由N掺杂碳涂覆的Li4Ti5O_（12）纳米片组装而成的具有增强的锂存储性能的分层空心微球

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摘要

Hierarchical hollow microspheres composed of N-doped carbon coated Li4Ti5O_(12) nanosheets (NC-LTQ) have been synthesized on a large scale by a facile low-temperature solution-based approach combined with high temperature calcination. The primary Li4Ti5O_(12) nanosheets show zigzag morphology with a typical thickness of about 5.0 nm, which are uniformly coated with N-doped carbon layers. When evaluated for lithium storage capacity, the NC-LTO hollow microspheres display enhanced electrochemical energy storage performances compared to the pristine hollow microspheres composed of Li4Ti5O_(12) nanosheets (A-LTO), including high capacity (181.4 mA h g~(-1) at 0,5 C), excellent rate capability (140.8 mA h g~(-1) at 20 C), and good cyclic stability (92.8% capacity loss after 100 cycles at 20 C). The reasons for these improvements are explored in terms of the increased electronic conductivity and the facilitation of lithium ion transport arising from the introduction of N-doped carbon layers and the thin zigzag Li4Ti5O_(12) nanosheets.
机译：由轻掺杂的基于低温溶液的方法与高温煅烧相结合，已大规模合成了由N掺杂的碳包覆的Li4Ti5O_（12）纳米片（NC-LTQ）组成的分层空心微球。主要的Li4Ti5O_（12）纳米片呈锯齿状形态，典型厚度约为5.0 nm，均匀地涂覆有N掺杂碳层。评估锂存储容量时，与由Li4Ti5O_（12）纳米片（A-LTO）组成的原始中空微球相比，NC-LTO中空微球显示出增强的电化学能量存储性能，包括高容量（181.4 mA hg〜（-1）在0.5 C时），优异的倍率能力（20 C时为140.8 mA hg〜（-1））和良好的循环稳定性（在20 C时100次循环后容量损失为92.8％）。从增加的电子电导率和促进的N掺杂的碳层和薄的锯齿状Li4Ti5O_（12）纳米片的引入引起的锂离子迁移的角度探讨了这些改进的原因。

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