In-situ fabricated succinonitrile-based composite electrolyte for high-performance and safe solid-state lithium batteries
Shiyao Chen, Shuping Wang, Qingkui Peng, Zesen Wei, Siyuan Cheng, Zheng Fang, Peiyu Duan, Yuan Cheng, Yifeng Cheng, Kaiqiang Jin, Lihua Jiang, Qingsong Wang
Abstract
The succinonitrile (SN) plastic crystal electrolyte with excellent comprehensive properties such as high room temperature (RT) ionic conductivity , wide electrochemical window and low cost, making it a promising candidate for RT solid-state lithium batteries (SSLBs). However, severe spontaneous chemical reactions between SN and active Li anode cause serious damage to the electrolyte/electrode interface, which still needs to be further improved. In this work, an in-situ polymerized SN-based composite solid-state electrolyte (CSE) is exploited to conquer the severe side-reactions between SN-based electrolyte and Li anode, the PALA0.5@-CSE (polyacrylonitrile (PAN): modified-Li l.3 Al 0.3 Ti l.7 (PO 4 ) 3 (LATP@) = 1:0.5, w/w) demonstrates an outstanding ionic conductivity (0.45 mS cm −1 ), high electrochemical stability (5.1 V) and improved Li + transference number (0.67) at RT. The Li symmetric cells with PALA0.5@-CSE shows a high critical current density (CCD) of 1.2 mA cm −2 , and the Li symmetric cells deliver excellent cycle stability over 500 h, demonstrating the superior ability of PALA0.5@-CSE to suppress the side-reactions between SN and Li anode and the rapid growth of Li dendrite. In Li||LiFePO 4 (LFP) full cell, the SSLBs provide excellent RT rate capability and stable cycling performance. Moreover, the PALA0.5@-CSE possesses high thermal stability and incombustibility, demonstrating its superior safety for the future utilization of SN-based SSLBs.