Abstract
Hierarchical flower-structured two-dimensional (2D) nanosheet is favorable for electrochemical reactions. The unique structure not only exposes the maximized active sites and shortens ion/electron diffusion channels, but also inhibits the structural strain during cycling processes. Herein, we report the hierarchical flower-like pure spinel manganese-based oxide nanosheets synthesized via a template-orientated strategy. The oriented template is fabricated by decomposition of carbonate obtained from “bubble reaction” via an alcohol-assisted hydrothermal process. The resultant spinel manganese-based oxide nanosheets simultaneously possess excellent rate capability and cycling stability. The high-voltage LiNi0.5Mn1.5O4 (LNMO-HF) has a uniform phase distribution without the common impurity phase LixNi1-xO2 and NixO. Besides, the LNMO-HF delivers high discharge capacity of 142.6 mA h g-1 with specific energy density of 660.7 W h kg-1 at 1 C under 55°C. More importantly, the template-orientated strategy can be extended to the synthesis of LiMn2O4 (LMO), which can achieve 88.12% capacity retention after 1000 cycles.
摘要
由二维(2D)纳米片组装成的多级花状结构有利于电化学反应. 这种独特的结构不仅可以暴露更多的活性位点、 缩短离子/电子扩散路径, 还可以确保良好的结构稳定性, 抑制重复循环过程中的结构应变. 本文通过模板导向策略合成多级花状纯相尖晶石锰基氧化物纳米片. 通过醇辅助水热法, 利用 “气泡反应” 原理获得的碳酸盐分解来制备取向模板. 最终产物尖晶石锰基氧化物纳米片同时满足优异的倍率性能和循环稳定性要求. 合成的分层花状高压LiNi0.5Mn1.5O4 (LNMO-HF)元素分布均匀, 且无杂相. LNMO-HF 可以提供142.6 mA h g−1的高放电容量, 在55°C、 1 C下, 其比能量密度为660.7 W h kg−1. 此外, 利用这种模板导向策略合成的 LiMn2O4 (LMO), 在1000次循环后, 其容量保持率可达88.12%.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21371023).
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Author contributions Cao C conceived the strategy. Zhao Q performed the experiments with support from Guo Z, Wu Y, Wang L, Han Z, Ma X, and Zhu Y. All authors contributed to the general discussion.
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Conflict of interest The authors declare no conflict of interest.
Chuanbao Cao is currently the chief responsible professor of the School of Materials Science and Engineering, Director of Research Center of Materials Science of Beijing Institute of Technology, China. His research is focused on the electrochemical energy storage and conversion including electrode materials of lithium ion battery, supercapacitors, catalyst and photo-electrochemical materials. Until now, he has published more than 320 peer-review research papers, holds or has filed 50 patents and patent
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Zhao, Q., Guo, Z., Wu, Y. et al. Hierarchical flower-like spinel manganese-based oxide nanosheets for high-performance lithium ion battery. Sci. China Mater. 62, 1385–1392 (2019). https://doi.org/10.1007/s40843-019-9442-x
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DOI: https://doi.org/10.1007/s40843-019-9442-x