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Internally inflated core-buffer-shell structural Si/EG/C composites as high-performance anodes for lithium-ion batteries

内膨胀核-缓冲-壳结构Si/EG/C复合材料应用于高性能锂离子电池负极

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Abstract

A watermelon-like internally inflated core-buffer-shell structural Si/electrochemically exfoliated graphene/C (Si/EG/C) composite is designed and prepared by the industrially established ball milling and spray drying method. Owing to numerous folds and voids in the EG filled between nano silicon and carbon shell, the volume fluctuations of silicon inside the Si/EG/C particles are buffered and lithium ions also could transport fast through the channels. With these advantages, the core-buffer-shell structural Si/EG/C composite demonstrates excellent electrochemical performance. The Si/EG/C anodes in half cells exhibit no degradation of the initial capacity (834 mA h g−1) after 100 cycles. Moreover, the Si/EG/C//LiCoO2 full cells retain almost 100% of the initial discharge capacity after 500 cycles. These results highlight the potential applications of Si/EG/C in the next generation of Li-ion batteries.

摘要

本文采用球磨和喷雾干燥法, 制备了类西瓜型可控内膨胀核-缓冲-壳结构Si/电化学剥离石墨烯/C(Si/EG/C)复合材料. 在纳米硅和碳壳之间填充了含大量褶皱和空隙的EG, 不仅缓冲了Si/EG/C颗粒内部硅的体积变化, 还提供了锂离子的快速传输通道. 凭借这些优势, 核-缓冲-壳结构的Si/EG/C表现出优异的电化学性能. 半电池中Si/EG/C负极在100次循环后相对于初始容量没有下降(834 mA h g−1). 此外, Si/EG/C//LiCoO2全电池在500次循环后相对于初始放电容量的容量保持率接近100%. 这些结果表明Si/EG/C在下一代锂离子电池中具有潜在应用前景.

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Acknowledgements

This work was supported by the National Key R&D Program of China (2018YFB0905400), the Key Laboratory Open Project of Guangdong Province (2018B030322001), and the National Natural Science Foundation of China (52172201, 51732005 and 11905081). The authors thank the Analytical and Testing Centre of HUST for material characterization.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Zeyu Zhang  (张泽宇), Shixiong Sun  (孙世雄), Wen Zhang  (张稳), Jia Xu  (徐佳), Xin Wang  (王鑫), Chun Fang  (方淳), Qing Li  (李箐) & Jiantao Han  (韩建涛)

Authors
  1. Zeyu Zhang  (张泽宇)
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  2. Shixiong Sun  (孙世雄)
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  3. Wen Zhang  (张稳)
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  4. Jia Xu  (徐佳)
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  5. Xin Wang  (王鑫)
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  6. Chun Fang  (方淳)
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  7. Qing Li  (李箐)
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  8. Jiantao Han  (韩建涛)
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Contributions

Zhang Z performed the experiments; Sun S designed the samples; Zhang W characterized the samples; Xu J performed the electrochemical measurements; Wang X analyzed the data; Fang C and Li Q contributed to the theoretical analysis; Zhang Z and Sun S wrote the paper with the support from Han J.

Corresponding authors

Correspondence to Shixiong Sun  (孙世雄), Chun Fang  (方淳) or Jiantao Han  (韩建涛).

Additional information

Supplementary information Supporting data are available in the online version of the paper.

Conflict of interest

The authors declare that they have no conflict of interest.

Zeyu Zhang is currently a master’s candidate at Huazhong University of Science and Technology (HUST). She received her BSc degree from Chongqing University in 2019. Her research interests focus on anode materials for lithium-ion batteries.

Shixiong Sun received his PhD degree from HUST in 2019. Presently, he is a postdoctoral researcher at the School of Materials Science and Engineering, HUST. His research focuses on energy storage materials for secondary batteries.

Chun Fang received her PhD degree from Fudan University in 2008. She then worked as a senior engineer at Evergreen Solar Corp. from 2009 to 2012. After that, she was an R&D manager at Empower Energy Corp. from 2012 to 2015. Currently, she is a research associate at HUST. Her research interests focus on new materials for energy storage applications.

Jiantao Han is a professor at the School of Materials Science and Engineering, HUST. He received his PhD degree in chemistry from Fudan University in 2007 and then worked at UT Austin (2007–2010), Los Alamos National Laboratory (2010–2012), and Pellion Tech. (2012–2014). He joined HUST as a full professor in 2016. His research interests include atomic distribution function (PDF) analysis and Li-ion batteries.

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Zhang, Z., Sun, S., Zhang, W. et al. Internally inflated core-buffer-shell structural Si/EG/C composites as high-performance anodes for lithium-ion batteries. Sci. China Mater. 65, 2949–2957 (2022). https://doi.org/10.1007/s40843-022-2083-2

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