State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, People's Republic of China.
College of Science, Huazhong Agricultural University , Wuhan 430070, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Aug 23;9(33):27707-27714. doi: 10.1021/acsami.7b06996. Epub 2017 Aug 8.
The employment of nanomaterials and nanotechnologies has been widely acknowledged as an effective strategy to enhance the electrochemical performance of lithium-ion batteries (LIBs). However, how to produce nanomaterials effectively on a large scale remains a challenge. Here, the highly crystallized ZnVO(OH)·2HO is synthesized through a simple liquid phase method at room temperature in a large scale, which is easily realized in industry. Through suppressing the reaction dynamics with ethylene glycol, a uniform morphology of microflowers is obtained. Owing to the multiple reaction mechanisms (insertion, conversion, and alloying) during Li insertion/extraction, the prepared electrode delivers a remarkable specific capacity of 1287 mA h g at 0.2 A g after 120 cycles. In addition, a high capacity of 298 mA h g can be obtained at 5 A g after 1400 cycles. The excellent electrochemical performance can be attributed to the high crystallinity and large specific surface area of active materials. The smaller particles after cycling could facilitate the lithium-ion transport and provide more reaction sites. The facile and scalable synthesis process and excellent electrochemical performance make this material a highly promising anode for the commercial LIBs.
纳米材料和纳米技术的应用已被广泛认为是提高锂离子电池（LIB）电化学性能的有效策略。然而，如何大规模有效地生产纳米材料仍然是一个挑战。在这里，通过在室温下的简单液相法在大规模上合成了高度结晶的 ZnVO(OH)·2HO，这在工业上很容易实现。通过乙二醇抑制反应动力学，可以得到均匀的微花形态。由于在 Li 插入/提取过程中存在多种反应机制（插入、转化和合金化），制备的电极在 0.2 A g 的电流密度下经过 120 次循环后具有显著的 1287 mA h g-1 的比容量。此外，在 5 A g 的电流密度下经过 1400 次循环后，仍可获得 298 mA h g-1 的高容量。优异的电化学性能归因于活性材料的高结晶度和大比表面积。循环后的较小颗粒可以促进锂离子的传输并提供更多的反应位点。这种材料具有简单、可扩展的合成工艺和优异的电化学性能，有望成为商业化 LIB 的高性能阳极材料。
