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通过在Na₃Zr₂Si₂PO₁₂中加强P-O共价性和接口修改,实现稳定和高速的准固态电池

Taiguang Li^1,2, Butian Chen¹, Tenghui Wang¹

¹Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, PR China.

Nature communications

|July 2, 2025

概括

这项研究通过提高接口稳定性和降低电阻来增强固态电池. 结合Na2SiF6和SnF2涂层导致稳定的涂层和高速率的性能在完整的细胞.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

固态金属电池提供更高的安全性,并利用丰富的资源.
接口不稳定性和树突阻碍了这些电池的速率能力和循环稳定性.

研究的目的:

为了解决固态电池的界面电阻和不稳定性.
通过接口工程来提高金属电池的性能和循环稳定性.

主要方法:

将Na2SiF6纳入Na3Zr2Si2PO12 (NZSP) 中,以增强PO共价性并抑制寄生反应.
涂上SnF2涂层,以创建一个sodiophilic表面并稳定NZSP接口.
使用Na3V2(PO4)3作为正电极制造和测试一个完整的电池.

主要成果:

将界面阻抗降低到2.0 Ω cm2.
在3600小时内稳定涂/脱光.
在2500次1C循环后达到87.5%的容量保留,在1C循环后达到96.1%,在1200次5C循环后达到96.1%.

结论:

纳2SiF6合并和SnF2涂层的综合方法有效地抑制了固态电池的接口问题.
这一战略使得高性能准固态电池具有出色的循环稳定性和速率能力.

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