Wenhao Tang, Taotao Zhou, Yang Duan, Miaomiao Zhou, Zhenchao Li, Ruiping Liu
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引用次数: 0
摘要
原位聚合凝胶电解质具有高能量密度和低界面阻抗的特点,因此被认为是锂金属电池(LMB)的理想电解质。本研究通过 DOL 和 TEP 的原位开环聚合制备了一种新型阻燃凝胶电解质。PDOL-TEP 电解质具有优异的室温离子电导率(0.38 mS cm-1)、宽电化学窗口(4.4 V)、高 Li+ 转移数(0.57)和更高的安全性。因此,采用 PDOL-TEP 电解质的 NCM811||Li 电池表现出卓越的循环稳定性(0.5 C 条件下循环 300 次后容量保持率为 82.7%)和速率性能(0.5 C 和 1 C 条件下分别为 156 和 119 mAh g-1)。此外,TEP 分解出的磷自由基可与氢自由基结合,阻止燃烧反应。这项工作为制备具有高电压、高能量密度和高安全性的固态 LMB 提供了一种有效的方法。
Nonflammable in situ PDOL-based gel polymer electrolyte for high-energy-density and high safety lithium metal batteries
Due to its high energy density and low interface impedance, in situ polymerized gel electrolytes were considered as a promising electrolyte candidate for lithium metal batteries (LMBs). In this work, a new flame-retardant gel electrolyte was prepared via in situ ring-opening polymerization of DOL and TEP. The PDOL–TEP electrolyte exhibits excellent room temperature ionic conductivity (0.38 mS cm−1), wide electrochemical window (4.4 V), high Li+ transference number (0.57), and enhanced safety. Thus, the NCM811||Li cells with PDOL–TEP electrolyte exhibit excellent cycle stability (82.7% of capacity retention rate after 300 cycles at 0.5 C) and rate performance (156 and 119 mAh g−1 at 0.5 and 1 C). Furthermore, phosphorus radicals decomposed from TEP can combine with hydrogen radicals to block the combustion reaction. This work provides an effective method for the preparation of solid-state LMBs with high voltage, high energy density, and high safety.