电化学电池内形成的准固态混合电解质的结构与演化,Advanced Materials

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电化学电池内形成的准固态混合电解质的结构与演化
Advanced Materials ( IF 27.4 ) Pub Date : 2022-06-28 , DOI: 10.1002/adma.202110333
Nyalaliska W Utomo ₁ , Yue Deng ₂ , Qing Zhao ₁ , Xiaotun Liu ₁ , Lynden A Archer _{1,

2}

Affiliation

通过液态前体聚合在电化学电池内部形成的固态电解质 (SSE) 为克服固态电池中电解质润湿问题提供了一种有前景的策略。通过原位聚合含有电化学惰性纳米结构的传统液体前体产生的混合固态聚合物电解质 (HSPE) 特别令人感兴趣，因为它们提供了一种选择性增强电解质或向电解质添加新功能的机制——无需高度聚合。由Al(OTf) ₃引发的含有毛状纳米SiO _{2的1,3-二氧戊环(DOL)聚合制备的HSPE的合成、结构、化学动力学、离子传输特性和电化学特性} 报告颗粒。小角度 X 射线散射显示颗粒在液体 DOL 中分散良好。_{束缚在 SiO 2}颗粒上的聚（乙二醇）分子和聚（DOL）之间的强相互作用导致共结晶——将纳米颗粒锚定在它们的主体中。它还可以研究和控制 DOL 中的聚合-解聚过程。原位形成的 HSPE 的效用首先在 Li|HSPE|Cu 半电池中得到证明，其库仑效率 (CE) 值接近 99%。HSPE 在固态锂-硫-聚丙烯腈 (SPAN) 复合全电池电池中也得到了证明。原位形成的Li|HSPE|SPAN电池显示出良好的循环稳定性，因此为全固态电池提供了一条有希望的道路。

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Structure and Evolution of Quasi-Solid-State Hybrid Electrolytes Formed Inside Electrochemical Cells

Solid-state electrolytes (SSEs) formed inside an electrochemical cell by polymerization of a liquid precursor provide a promising strategy for overcoming problems with electrolyte wetting in solid-state batteries. Hybrid solid-state polymer electrolytes (HSPEs) created by in situ polymerization of a conventional liquid precursor containing electrochemically inert nanostructures are of particular interest because they offer a mechanism for selectively reinforcing or adding new functionalities to the electrolyte—removing the need for high degrees of polymerization. The synthesis, structure, chemical kinetics, ion-transport properties and electrochemical characteristics of HSPEs created by Al(OTf)₃-initiated polymerization of 1,3-dioxolane (DOL) containing hairy, nano-sized SiO₂ particles are reported. Small-angle X-ray scattering reveals the particles are well-dispersed in liquid DOL. Strong interaction between poly(ethylene glycol) molecules tethered to the SiO₂ particles and poly(DOL) lead to co-crystallization—anchoring the nanoparticles in their host It also enables polymerization–depolymerization processes in DOL to be studied and controlled. The utility of the in-situ-formed HSPE, is demonstrated first in Li|HSPE|Cu half cells, which manifest Coulombic efficiencies (CE) values approaching 99%. HSPEs are also demonstrated in solid-state lithium–sulfur–polyacrylonitrile (SPAN) composite full-cell batteries. The in-situ-formed Li|HSPE|SPAN cells show good cycling stability and thus provide a promising path toward all-solid-state batteries.

更新日期：2022-06-28

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