使用PVP作为聚合物电解质膜提高用于磷酸铁锂电池的聚偏氟乙烯/纳米粘土的离子电导率和循环稳定性

Ionic Conductivity and Cycling Stability Improvement of PVDF/Nano-Clay Using PVP as Polymer Electrolyte Membranes for LiFePO₄ Batteries.

作者信息

Dyartanti Endah R, Purwanto Agus, Widiasa I Nyoman, Susanto Heru

机构信息

Department of Chemical Engineering, Diponegoro University, Semarang 50275, Indonesia.

Department of Chemical Engineering, Universitas Sebelas Maret, Surakarta 57126, Indonesia.

出版信息

Membranes (Basel). 2018 Jul 1;8(3):36. doi: 10.3390/membranes8030036.

DOI:10.3390/membranes8030036

PMID:29966396

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6160946/

Abstract

In this paper, we present the characteristics and performance of polymer electrolyte membranes (PEMs) based on poly(vinylidene fluoride) (PVDF). The membranes were prepared via a phase-inversion method (non-solvent-induced phase separation (NIPS)). As separators for lithium battery systems, additive modified montmorillonite (MMT) nano-clay served as a filler and poly(vinylpyrrolidone) (PVP) was used as a pore-forming agent. The membranes modified with an additive (8 wt % nano-clay and 7 wt % PVP) showed an increased porosity (87%) and an uptake of a large amount of electrolyte (801.69%), which generated a high level of ionic conductivity (5.61 mS cm) at room temperature. A graphite/PEMs/LiFePO₄ coin cell CR2032 showed excellent stability in cycling performance (average discharge capacity 127 mA h g). Based on these results, PEMs are promising materials to be used in Polymer Electrolyte Membranes in lithium-ion batteries.

摘要

在本文中，我们展示了基于聚偏氟乙烯（PVDF）的聚合物电解质膜（PEM）的特性和性能。这些膜通过相转化法（非溶剂诱导相分离（NIPS））制备。作为锂电池系统的隔膜，添加改性蒙脱土（MMT）纳米粘土作为填料，聚乙烯吡咯烷酮（PVP）用作致孔剂。用添加剂（8重量％纳米粘土和7重量％PVP）改性的膜显示出孔隙率增加（87％）和大量电解质吸收（801.69％），在室温下产生了高水平的离子电导率（5.61 mS cm）。石墨/PEMs/LiFePO₄扣式电池CR2032在循环性能方面表现出优异的稳定性（平均放电容量127 mA h g）。基于这些结果，PEM是用于锂离子电池中的聚合物电解质膜的有前途的材料。