A Solid Electrolyte Based on Sodium-Doped Li4-xNaxTi5O12 with PVDF for Solid State Lithium Metal Battery.

IF 7.5 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2024-11-20 DOI:10.1002/cssc.202401755
Qiyue Chen, Haitao Lv, Jun Peng, Qi Zhou, Wenzhuo Wu, Jing Wang, Lili Liu, Lijun Fu, Yuhui Chen, Yuping Wu
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引用次数: 0

Abstract

Solid-state batteries (SSBs) present a potential pathway for advancing next-generation lithium batteries, characterized by exceptional energy density and enhanced safety performance. Solid-state electrolytes have been extensively researched, yet an affordable option with outstanding electrochemical performance is still lacking. In this work, Li4-xNaxTi5O12 (LNTO)-based composite solid electrolytes (CSEs) were developed to enhance the interface stability and electronic insulation. The CSE is composed of Li3.88Na0.12Ti5O12 (LNTO3) and poly (vinylidene fluoride) (PVDF) with a proportion of 20 wt % exhibited high ionic conductivity (4.49×10-4 S cm-1 at a temperature value equal to 35 °C), high ionic transfer number (equal to 0.72), low activation energy (equal to 0.192 eV), and favorable compatibility with the Li metal anode. The Li|LNTO3|LiFePO4 cell, tested at a 0.5 C current density, demonstrated 154.5 mAh g-1 of outstanding cycling stability for 200 cycles, capacity retention of 97.6 % along with a Coulombic efficiency of over 99 %, as well as a significant average specific capacity of 127.8 mAh g-1 over 400 cycles at 5 C. The Li|LNTO3|LiNi0.8Co0.1Mn0.1O2 (NCM811) cell could also operate over 100 cycles at 1 C. This study offers an effective method for preparing commercial CSEs for SSBs.

基于钠掺杂 Li4-xNaxTi5O12 与 PVDF 的固态电解质,用于固态锂金属电池。
固态电池(SSB)是推动下一代锂电池发展的潜在途径,其特点是能量密度极高,安全性能更强。固态电解质已被广泛研究,但仍缺乏一种具有出色电化学性能且经济实惠的选择。本研究开发了基于 Li4-xNaxTi5O12 (LNTO) 的复合固体电解质(CSE),以增强界面稳定性和电子绝缘性。该 CSE 由 Li3.88Na0.12Ti5O12 (LNTO3) 和聚偏二氟乙烯 (PVDF) 组成,比例为 20 wt.%,具有高离子电导率(在温度值等于 35 °C 时为 4.49 × 10-4 S cm-1)、高离子转移数(等于 0.72)、低活化能(等于 0.192 eV)以及与锂金属阳极的良好兼容性。在 0.5 摄氏度电流密度下测试的 Li|LNTO3|LiFePO4 电池在 200 次循环中表现出 154.5 mAh g-1 的出色循环稳定性、97.6% 的容量保持率和超过 99% 的库仑效率,以及在 5 摄氏度下 400 次循环中 127.8 mAh g-1 的显著平均比容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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