Formatted PVDF in lamellar composite solid electrolyte for solidstate lithium metal battery  

作　　者：Xinji Zhang Yafang Zhang Shiyue Zhou Jingchuan Dang Chenye Wang Wenjia Wu Jingtao Wang 

机构地区：[1]School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Nano Research》2024年第6期5159-5167,共9页纳米研究（英文版）

基　　金：National Natural Science Foundation of China(No.U2004199);Joint Foundation for Science and Technology Research&Development Plan of Henan Province(Nos.222301420003 and 232301420038);China Postdoctoral Science Foundation(No.2022TQ0293);Key Science and Technology Project of Henan Province(No.221100240200-06).

摘　　要：Solid polymer electrolytes(SPEs)hold great application potential for solid-state lithium metal battery because of the excellent interfacial contact and processibility,but being hampered by the poor room-temperature conductivity(~10^(−7)S·cm^(−1))and low lithium-ion transference number(tLi+).Here,a lamellar composite solid electrolyte(Vr-NH_(2)@polyvinylidene fluoride(PVDF)LCSE)withβ-conformation PVDF is fabricated by confining PVDF in the interlayer channel of-NH_(2)modified vermiculite lamellar framework.We demonstrate that the conformation of PVDF can be manipulated by the nanoconfinement effect and the interaction from channel wall.The presence of-NH_(2)groups could induce the formation ofβ-conformation PVDF through electrostatic interaction,which serves as continuous and rapid lithium-ion transfer pathway.As a result,a high room-temperature ionic conductivity of 1.77×10^(−4)S·cm^(−1)is achieved,1-2 orders of magnitude higher than most SPEs.Furthermore,Vr-NH_(2)@PVDF LCSE shows a high tLi+of 0.68 because of the high dielectric constant,~3 times of that of PVDF SPE,and surpassing most of reported SPEs.The LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)||Li cell assembled by Vr-NH_(2)@PVDF LCSE obtains a discharge specific capacity of 137.1 mAh·g^(−1)after 150 cycles with a capacity retention rate of 93%at 1 C and 25℃.This study may pave a new avenue for high-performance SPEs.

关 键 词：solid-state lithium metal battery lamellar composite solid electrolyte β-conformation polyvinylidene fluoride(PVDF) room-temperature ionic conductivity lithium-ion transference number 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]