广东工业大学学报 ›› 2023, Vol. 40 ›› Issue (06): 88-94.doi: 10.12052/gdutxb.230139

• 催化与能源材料 • 上一篇    下一篇

Al2O3原位修饰Al集流体促进钠均匀沉积/剥离

唐芳, 夏荣庆, 芮先宏   

  1. 广东工业大学 材料与能源学院, 广东 广州 510006
  • 收稿日期:2023-09-08 出版日期:2023-11-25 发布日期:2023-11-08
  • 通信作者: 芮先宏(1985-),男,教授,博士,主要研究方向为新型储能材料与器件,E-mail:xhrui@gdut.edu.cn
  • 作者简介:唐芳(1994-),女,博士研究生,主要研究方向为钠金属负极集流体改性
  • 基金资助:
    国家自然科学基金资助项目(51972067)

Al2O3 In-situ Modified Al Current Collectors for Uniform Na Plating/Stripping

Tang Fang, Xia Rong-qing, Rui Xian-hong   

  1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2023-09-08 Online:2023-11-25 Published:2023-11-08

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摘要： 钠金属电池因其高理论比容量和低成本被认为是最具发展前景的大规模储能电池之一。然而，钠金属的高反应活性，易导致固体电解质界面膜不稳定、钠不均匀沉积、枝晶生长等问题。为此，本文采用简单的一步煅烧法制备了一种Al2O3原位修饰的Al箔集流体(Al@Al2O3)，促进钠均匀沉积/剥离。在充放电过程中，Al2O3被钠化形成一层高离子电导率的Na-Al-O膜，其不仅能稳定电极/电解液界面，还能调节集流体表面的成核行为，降低成核能垒、提高离子传质动力学，实现无枝晶均匀沉积和长循环寿命。结果表明，在3 mA·cm-2电流密度和3 mAh·cm-2面容量下，Al@Al2O3能以99.6%的平均库伦效率使钠稳定沉积/剥离50次；在1 mA·cm-2电流密度和1 mAh·cm-2面容量条件下，Na-Al@Al2O3‖Na-Al@Al2O3对称电池能稳定循环1000 h；甚至在10 C的高电流密度下，NVP‖Na-Al@Al2O3全电池也能稳定循环250次，且容量保持率高达94%。

关键词: 钠金属电池, 钠金属负极, 无枝晶, 高界面稳定性, Al@Al2O3

Abstract: Na metal batteries are considered to be one of the most promising large-scale energy storage batteries due to their high theoretical specific capacity and low cost. However, the high reactivity of sodium metal can easily lead to problems such as instability of the solid electrolyte interface (SEI) film, uneven deposition of sodium, and dendrite growth. Here, an Al2O3 in-situ modified Al foil current collector (Al@Al2O3) was fabricated by a facile one-step calcination method to promote uniform Na deposition/stripping. During the discharge process, Al2O3 is sodiumified to form a Na-Al-O film with high ion conductivity, which not only stabilizes the electrode/electrolyte interface, but also regulates the nucleation behavior on the current collector surface, reducing the formation of nuclear energy barrier, improving ion mass transfer kinetics, and achieving uniform deposition of dendrite-free sodium and long cycle life. The results show that Al@Al2O3 can stably deposit/strip sodium for 50 times with an average Coulombic efficiency of 99.6% under 3 mA·cm-2/3 mAh·cm-2; and that the Na-Al@Al2O3‖Na-Al@Al2O3 symmetric battery can be cycled stably for 1000 h at 1 mA·cm-2 and 1 mAh·cm-2. Even at a high current density of 10 C, the NVP‖Na-Al@Al2O3 full cell can be cycled stably for 250 cycles with a high capacity retention of 94%.

Key words: sodium metal battery, sodium metal anode, dendrite-free, high interfacial stability, Al@Al2O3

中图分类号: 

  • TQ323.7
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