Cross-linked Single-Ion Solid Polymer Electrolytes with Alternately Distributed Lithium Sources and Ion-Conducting Segments for Lithium Metal Batteries,Macromolecules

当前位置： X-MOL 学术 › Macromolecules › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Cross-linked Single-Ion Solid Polymer Electrolytes with Alternately Distributed Lithium Sources and Ion-Conducting Segments for Lithium Metal Batteries
Macromolecules ( IF 5.1 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.macromol.1c01102
Shaoshan Chen ₁ , Yu Li _{1,

2} , Yong Wang ₁ , Zeyu Li ₁ , Cong Peng ₁ , Yiyu Feng _{1,

2,

3} , Wei Feng _{1,

2}

Affiliation

Solid polymer electrolytes (SPEs), with improved energy densities and operational safety, have replaced liquid electrolytes in next-generation Li metal batteries (LMBs). However, the detrimental effect of anion polarization associated with a conventional dual-ion SPE caused by a relatively low Li-ion transference number prohibits its use in devices that require high power densities. Herein, an alternating copolymer slightly cross-linked by diamino polyethylene glycol (NH₂-PEG-NH₂) containing ethylene glycol oligomers associated with immobilized 4-styrenesulfonyl(4-(trifluoromethoxy)benzenesulfonyl)imide (SSTFMBSI^–) anions (cross-linked-P[SSTFMBSILi-alt-(MA-g-mPEG8-NH₂)]) was prepared. The homogeneous distribution of Li⁺ sources and conducting segments within the prepared single-ion SPE (SSPE) facilitated Li⁺ migration, with the slightly cross-linked structure reducing the crystallinity and providing mechanical strength for film formation. The SSPE exhibited an improved ionic conductivity at 30 °C (1.96 × 10^–5 S/cm) and a wide electrochemical window with Li metal contact. Compared to LMBs with traditional poly(ethylene oxide)-based SPEs, LMBs with the prepared SSPE exhibited good rate capability and cycling life, indicating potential for applications in next-generation safe LMBs.

中文翻译：

用于锂金属电池的具有交替分布的锂源和离子传导段的交联单离子固体聚合物电解质

固态聚合物电解质 (SPE) 具有更高的能量密度和操作安全性，已取代下一代锂金属电池 (LMB) 中的液态电解质。然而，由相对较低的锂离子迁移数引起的与传统双离子 SPE 相关的阴离子极化的不利影响阻碍了其在需要高功率密度的设备中的使用。在此，一种交替共聚物由二氨基聚乙二醇 (NH ₂ -PEG-NH ₂ )轻微交联，其中包含与固定的 4-苯乙烯磺酰基(4-(三氟甲氧基)苯磺酰基)酰亚胺 (SSTFMBSI ^– ) 阴离子相关的乙二醇低聚物（交联-P [SSTFMBSILi- ALT - （MA-克-mPEG8-NH ₂)]) 准备好了。制备的单离子 SPE (SSPE)中 Li ⁺源和导电链段的均匀分布促进了 Li ⁺迁移，轻微交联的结构降低了结晶度并为成膜提供了机械强度。SSPE 在 30 °C (1.96 × 10 ^–5 S/cm)下表现出更高的离子电导率和与锂金属接触的宽电化学窗口。与具有传统聚环氧乙烷基 SPE 的 LMB 相比，具有制备的 SSPE 的 LMB 表现出良好的倍率性能和循环寿命，表明其在下一代安全 LMB 中的应用潜力。

更新日期：2021-10-12

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11