Suo Jing, Jia Yaya, Zhu Xinxin, Liu Shan, Tang Xianjian, Liang Feng, Wang Ling, Lu Jun
School of Chemical Engineering, North China University of Science and Technology, Tangshan, 063009, China.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310058, China.
Adv Mater. 2024 Nov;36(48):e2409587. doi: 10.1002/adma.202409587. Epub 2024 Oct 13.
Solid sodium metal batteries (SSMBs) offer an alternative promising power source for electrochemical energy storage due to their high energy density and high safety. However, the inherent sodium dendrite growth and poor mechanical properties of electrolytes seriously limit their application. Herein, a network structure composed of polyethylene oxide-based composite polymer electrolyte (CPE) is designed with liquid metal nanoparticles (LM) for SSMBs, in which LM can move in the solid electrolyte with the electric field driven. This effect can facilitate the inactivated sodium return to the metal sodium anode, and alloy with dendrites at the same time, which is beneficial for inhibiting the growth of dendrites. The symmetric cell with the CPE containing LM achieves good cyclic stability of more than 1800 and 800 h at 0.1 and 0.2 mA cm, respectively. The energy density of the pouch battery can reach 230 Wh kg. In sum, LM presents great potential to be employed as a performance reinforcement filler for CPEs, which paves the way for achieving high-performance SSMBs.
固态钠金属电池（SSMBs）因其高能量密度和高安全性，为电化学储能提供了一种有前景的替代电源。然而，电解质固有的钠枝晶生长和较差的机械性能严重限制了它们的应用。在此，设计了一种由基于聚环氧乙烷的复合聚合物电解质（CPE）与液态金属纳米颗粒（LM）组成的网络结构用于SSMBs，其中LM可在电场驱动下在固体电解质中移动。这种效应可促进失活的钠返回金属钠阳极，并同时与枝晶形成合金，这有利于抑制枝晶生长。含有LM的CPE的对称电池在0.1和0.2 mA cm时分别实现了超过1800小时和800小时的良好循环稳定性。软包电池的能量密度可达230 Wh kg。总之，LM作为CPE的性能增强填料具有巨大潜力，这为实现高性能SSMBs铺平了道路。
