Simultaneously Boosting the Ionic Conductivity and Mechanical Strength of Polymer Gel Electrolyte Membranes by Confining Ionic Liquids into Hollow Silica Nanocavities,Batteries & Supercaps

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Simultaneously Boosting the Ionic Conductivity and Mechanical Strength of Polymer Gel Electrolyte Membranes by Confining Ionic Liquids into Hollow Silica Nanocavities
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-09-19 , DOI: 10.1002/batt.201900095
Bishnu P. Thapaliya _{1,

2} , Chi‐Linh Do‐Thanh ₁ , Charl J. Jafta ₂ , Runming Tao ₁ , Hailong Lyu _{1,

2} , Albina Y. Borisevich ₃ , Shi‐ze Yang ₄ , Xiao‐Guang Sun ₂ , Sheng Dai _{1,

2}

Affiliation

A central problem of solid polymer electrolytes is their inability to achieve robust mechanical strength with fast ionic conductivities required for commercialization of lithium metal batteries (LMBs). At present, state‐of‐the‐art offers superiority of one at the expense of the other. Here, this dilemma has been solved by fabricating mechanically robust solid composite polymer electrolytes (SCPEs) with superior ionic conductivity (0.5 mS cm⁻¹ at 20 °C) by confining ionic liquids (ILs) in the hollow scaffold offered by hollow silica (HS) nanospheres with unique architecture. Mechanical robustness was verified by the performance of a Li||Li symmetric cell cycling for extended hours without short‐circuiting. In addition, SCPEs with HS have higher thermal and electrochemical stabilities than those without HS, due to strong interaction and coordination of HS nanoparticles with polymer and ionic liquids. Electrode compatibility and flexibility of the membrane could advance the LMBs technology.

中文翻译：

通过将离子液体限制在空心二氧化硅纳米腔中，同时提高聚合物凝胶电解质膜的离子电导率和机械强度

固体聚合物电解质的中心问题是，它们无法获得锂金属电池（LMB）商业化所需的具有快速离子电导率的强大机械强度。当前，最先进的技术提供了一种优势，而另一种却以牺牲为代价。在此，这一难题已通过制造具有优异离子传导率（0.5 mS cm ^-1）的机械坚固的固体复合聚合物电解质（SCPE）得以解决。通过将离子液体（ILs）限制在具有独特结构的中空二氧化硅（HS）纳米球提供的中空支架中来实现。通过Li || Li对称电池循环长时间（不发生短路）的性能来验证机械强度。此外，由于HS纳米粒子与聚合物和离子液体的强相互作用和配位，具有HS的SCPE具有比不具有HS的SCPE更高的热稳定性和电化学稳定性。膜的电极兼容性和柔韧性可以促进LMBs技术的发展。

更新日期：2019-09-19

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