Huang Zhenxin, Zhang Zhuangfei, Shen Nan, Li Aijiao, Wang Hui, Fang Chao, Xu Tingting, Kong Dezhi, Li Xinjian, Shi Yumeng, Liu Xiaobing, Zeng Longhui, Yang Hui Ying, Wang Ye, Shan Chongxin
Key Laboratory of Materials Physics, Ministry of Education, School of Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China.
College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China.
Nano Lett. 2025 Jun 18;25(24):9589-9596. doi: 10.1021/acs.nanolett.5c01172. Epub 2025 Jun 3.
Sodium metal anodes hold great promise for next-generation batteries due to their high theoretical capacity and low working potential, yet notorious Na dendrites impose tremendous safety concerns. Here, diamane (two-dimensional diamond) nanoflakes modulating the polypropylene (PP) separator are implemented to address this issue. The diamane physically exfoliated from commercially available diamond exhibits its superiority in suppressing the Na dendrites formation by stable sp carbon surface. Using the PP/diamane separator, Na metal anodes demonstrate exceptional stability for over 1000 h at an ultrahigh current density of 20 mA cm. Notably, the separator also ensures stable cycling of Na metal anodes at an elevated temperature of 60 °C. Encouragingly, the full cell of Na||PP/diamane||NaV(PO)@C delivers a high capacity of 81.6 mAh g with a minimal decay of 0.003% per cycle after 1000 cycles. These results provide a promising strategy for realizing stable Na metal anodes via the incorporation of diamane nanoflakes.
由于具有高理论容量和低工作电位，钠金属阳极在下一代电池领域极具前景，然而，臭名昭著的钠枝晶带来了巨大的安全隐患。在此，通过采用调控聚丙烯（PP）隔膜的二胺（二维金刚石）纳米片来解决这一问题。从市售金刚石物理剥离得到的二胺，通过稳定的sp碳表面在抑制钠枝晶形成方面展现出优势。使用PP/二胺隔膜，钠金属阳极在20 mA cm的超高电流密度下表现出超过1000小时的卓越稳定性。值得注意的是，该隔膜还能确保钠金属阳极在60°C的高温下稳定循环。令人鼓舞的是，Na||PP/二胺||NaV(PO)@C全电池在经过1000次循环后，具有81.6 mAh g的高容量，且每循环的衰减极小，仅为0.003%。这些结果为通过引入二胺纳米片实现稳定的钠金属阳极提供了一种有前景的策略。
