Novel quasi-solid-state composite electrolytes boost interfacial Li+ transport for long-cycling and dendrite-free lithium metal batteries

材料科学 电解质 复合数 锂(药物) 快离子导体 离子电导率 聚合物 化学工程 高分子化学 电极 复合材料 物理化学 内分泌学 化学 工程类 医学 生物化学
作者
Yin Cui,Dongtian Miao,Guofang Yu,Minghong Zhou,Ruliang Liu,Shaohong Liu,Dingcai Wu
出处
期刊:Energy Storage Materials [Elsevier BV]
卷期号:56: 258-266 被引量:9
标识
DOI:10.1016/j.ensm.2023.01.016
摘要

Solid-state composite electrolytes (SCEs) have received wide attention due to their advantages of both solid-state polymer electrolytes and inorganic ceramic electrolytes. However, poor interfacial compatibility in SCEs still limits their practical applications in lithium metal batteries. Herein, a lotus pod-inspired flexible PC-g-PMT/LL-g-PMT20 membrane composed of zero-dimensional LLZTO-g-PVIM+TFSI− (denoted as LL-g-PMT) hairy nanoparticle, one-dimensional PVDF-CTFE-g-PVIM+TFSI− (denoted as PC-g-PMT) comb polymer, and lithium salt LiTFSI (LLZTO = Li6.4La3Zr1.4Ta0.6O12; PVDF-CTFE = poly(vinylidene fluoride-co-chlorotrifluoroethylene); PVIM+TFSI− = poly(1-butyl-3-vinylimidazolium bis(trifluoromethylsulphonyl)imide); LiTFSI = lithium bis(trifluoromethylsulphonyl)imide) is designed and prepared. Our PC-g-PMT/LL-g-PMT20 membrane facilitates molecular-level homogeneous lithium ion (Li+) flux, provides fast transmission pathways for Li+ by the three-dimensional well-developed porous framework, and improves interfacial stability via molecular engineering. The quasi-solid-state composite electrolytes (QSCEs) can be further obtained facilely via introducing plasticizer into PC-g-PMT/LL-g-PMT20 membrane. The as-obtained QSCEs (e.g., PC-g-PMT/LL-g-PMT20/P) integrate features of LLZTO-enhanced Li+ conducting and mechanical properties, PVDF-CTFE backbone-induced flexibility, and PVIM+TFSI− side-chain-strengthened interfacial compatibility. As a result, our PC-g-PMT/LL-g-PMT20/P has a membrane thickness as low as 22 µm, but still delivers an ionic conductivity as high as 6.03 × 10−4 S cm−1 at room temperature. Furthermore, Li/LFP full cell with PC-g-PMT/LL-g-PMT20/P exhibits excellent rate and cycling performance.
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