期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202103530
关键词
high voltage; lithium metal batteries; single-ion conducting polymers; solid polymer electrolytes
类别
资金
- National Key R&D Program of China [2018YFB0104300]
- Beijing Municipal Natural Science Foundation [2202027]
- National Natural Science Foundation of China [21773055, U1604122, 51702086, 22005085, 21805070, 51872026]
The study presents a promising strategy for designing solid state single-ion conducting polymer electrolytes (SSPEs) with high ionic conductivity and good interfacial compatibility by fabricating an interpenetrating single-ion network polymer (PTF-4EO) through crosslinking lithium tetrakis(4-(chloromethyl)-2,3,5,6-tetrafluorophenyl)borate salt with tetraethylene glycol. This novel SSPE demonstrates remarkable room-temperature conductivity, lithium-ion transference number, electrochemical window, and mechanical properties, leading to enhanced cycling stability, coulombic efficiency, capacity retention, and safety in solid-state lithium metal batteries.
Solid state single-ion conducting polymer electrolytes (SSPEs) are one of the most promising candidates for long-life lithium-metal batteries. However, the traditional polyanion-type structure of SSPEs inevitably gives rise to insufficient conductivity and inferior mechanical stability, which limits their practical application. Herein, an interpenetrating single-ion network polymer (PTF-4EO) is fabricated by crosslinking lithium tetrakis(4-(chloromethyl)-2,3,5,6-tetrafluorophenyl)borate salt with tetraethylene glycol. The unique structure enables a PTF-4EO with weakly interacting anions and coordinating ether oxygen segments that functions as a high-performing SSPE, that delivers a high room-temperature conductivity of 3.53 x 10(-4) S cm(-1), exceptional superior lithium-ion transference number of 0.92, wide electrochemical window > 4.8 V, and good mechanical properties. Moreover, the resultant SSPE can directly participate in constructing a favorable Janus solid electrolyte interphase, which further enhances the interfacial stability of the metallic lithium anode. The as-assembled LiFePO4||Li solid batteries present prominent cycling stability, coulombic efficiency, and capacity retention over 200 cycles between 2.50 and 4.25 V. Furthermore, LiNi0.7Mn0.2Co0.1O2||Li pouch cells exhibit remarkable safety even under harsh conditions. This study thereby offers a promising strategy for SSPE design to simultaneously achieve high ionic conductivity and good interfacial compatibility toward practical high-energy-density solid-state lithium metal batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据