由氢键构成的机械强和电化学稳定的单离子导电聚合物电解质,Langmuir

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由氢键构成的机械强和电化学稳定的单离子导电聚合物电解质
Langmuir ( IF 3.7 ) Pub Date : 2021-07-01 , DOI: 10.1021/acs.langmuir.1c01035
Huihui Gan ₁ , Shaoqiao Li ₁ , Yong Zhang ₁ , Liping Yu ₁ , Jirong Wang ₁ , Zhigang Xue ₁

Affiliation

在此，通过静电纺丝技术制备了基于单离子导电聚合物电解质（SIPE）和聚（偏二氟乙烯-六氟丙烯）（PVDF-HFP）的复合膜。通过 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido) 甲基丙烯酸乙酯 (UPyMA) 的可逆加成-断裂链转移 (RAFT) 共聚反应获得具有氢键的 SIPE 、聚（乙二醇）甲基醚甲基丙烯酸酯（PEGMA）和4-苯乙烯磺酰基（苯基磺酰基）亚胺锂（SSPSILi）。所得复合膜具有高度多孔的网络结构、优异的热稳定性（>300°C）和高机械强度（17.3 MPa）。制备的不含锂盐的 SIPE/PVDF-HFP 复合膜具有 2.78 × 10 ^–5 S cm ^–1的高离子电导率在 30°C 时，与锂金属电极的相容性好，锂离子转移数高（0.89）。对称Li//Li电池表现出优异的循环性能，没有短路，表明在镀锂/脱锂过程中SIPE和锂金属电极之间产生了稳定的界面，这可以抑制锂金属电池中锂枝晶的生长。 LMB）。Li//LiFePO ₄电池在 60 或 25 °C 下也表现出优异的循环寿命和优异的倍率性能。因此，复合膜对先进的 LMB 具有可观的未来前景。

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Mechanically Strong and Electrochemically Stable Single-Ion Conducting Polymer Electrolytes Constructed from Hydrogen Bonding

Herein, composite membranes based on a single-ion conducting polymer electrolyte (SIPE) and poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) were prepared by an electrospinning technology. The SIPE with hydrogen bonding was obtained via reversible addition–fragmentation chain transfer (RAFT) copolymerization of 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (UPyMA), poly(ethylene glycol) methyl ether methacrylate (PEGMA), and lithium 4-styrenesulfonyl (phenylsulfonyl) imide (SSPSILi). The obtained composite membrane exhibited a highly porous network structure, superior thermal stability (>300 °C), and high mechanical strength (17.3 MPa). The fabricated SIPE/PVDF-HFP composite membrane without lithium salts possessed a high ionic conductivity of 2.78 × 10^–5 S cm^–1 at 30 °C, excellent compatibility with the lithium metal electrode, and high lithium-ion transference number (0.89). The symmetric Li//Li cell exhibited a superior cycle performance without short circuit, indicating the generation of a stable interface between SIPE and the lithium metal electrode during the process of lithium plating/stripping, which could inhibit lithium dendrite growth in lithium metal batteries (LMBs). The Li//LiFePO₄ cell also exhibited superior cycle life and excellent rate capability at 60 or 25 °C. In consequence, the composite membrane exhibits a considerable future prospect for advanced LMBs.

更新日期：2021-07-13

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