Long Cycle Life and High-Rate Sodium Metal Batteries Enabled by Regulating 3D Frameworks with Artificial Solid-State Interphases

作者：Lai, Xuejun; Xu, Zhenming; Yang, Xianfeng; Ke, Qiongjie; Xu, Qingshuai; Wang, Zaisheng^*; Lu, Yingying; Qiu, Yongcai^*

来源：Advanced Energy Materials, 2022, 12(10): 2103540.

DOI：10.1002/aenm.202103540

• artificial interphase
• Coulombic efficiency
• dendrite growth
• Na metal anodes
• solid-electrolyte interphase

The major challenge for sodium metal anodes is Na dendrite growth owing to the unstable and fragile solid-electrolyte interphase (SEI), leading to terrible cycle life and safety hazards. Constructing a robust SEI around a 3D porous host is considered to be a facile and efficient approach to stabilize Na metal anodes. Here, a durable 3D porous SnCl4@Na-rGO metal anode is fabricated by the in situ chemical reaction of SnCl4-containing carbonate electrolyte with Na-rGO. Attributed to the robust SEI and the stereoscopic structure, the symmetric cells achieve a prolonged cycle life of 500 h without voltage fluctuation at 2 mA cm(-2) and 2 mAh cm(-2). Moreover, the Na3V2(PO4)(3)||SnCl4@Na-rGO full cell exhibits long-term cycle stability (>600 cycles) and remarkable capacity retention (>92%). The novel approach provides an efficacious strategy for the practical implementation of Na metal batteries.

• 单位
  南京航空航天大学; 浙江大学