New Class of LAGP-Based Solid Polymer Composite Electrolyte for Efficient and Safe Solid-State Lithium Batteries,ACS Applied Materials & Interfaces

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New Class of LAGP-Based Solid Polymer Composite Electrolyte for Efficient and Safe Solid-State Lithium Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1021/acsami.7b12092
Qingpeng Guo ₁ , Yu Han ₁ , Hui Wang ₁ , Shizhao Xiong ₁ , Yujie Li ₁ , Shuangke Liu ₁ , Kai Xie ₁

Affiliation

Inorganic solid electrolytes (SEs) possess substantial safety and electrochemical stability, which make them as key components of safe rechargeable solid-state Li batteries with high energy density. However, complicated integrally molding process and poor wettability between SEs and active materials are the most challenging barriers for the application of SEs. In this regard, we explore composite SEs of the active ceramic Li_1+xAl_xGe_2–x(PO₄)₃ (LAGP) as the main medium for ion conduction and the polymer P(VDF-HFP) as a matrix. Meanwhile, for the first time, we choice high chemical, thermal, and electrochemical stability of ionic liquid swelled in polymer, which significantly ameliorate the interface in the cell. In addition, a reduced crystallinity degree of the polymer in the electrolyte can also be achieved. All of these lead to good ionic conductivity of the composite electrolyte (LPELCE), at the same time, good compatibility with the lithium electrode. Especially, high mechanical strength and stable solid electrolyte interphase which suppressed the growth of lithium dendrites and high thermal safety stability can also be observed. For further illustration, the solid-state lithium battery of LiFePO₄/LPELCE/Li shows relatively satisfactory performance, indicating the promising potentials of using this type of electrolyte to develop high safety and high energy density solid-state lithium batteries.

中文翻译：

新型基于LAGP的高效安全固态锂电池固体聚合物复合电解质

无机固体电解质（SEs）具有很高的安全性和电化学稳定性，使其成为具有高能量密度的安全可充电固态锂电池的关键组件。但是，复杂的整体成型工艺以及SE与活性材料之间的润湿性差是SE应用的最大挑战。在这方面，我们探索了活性陶瓷Li _{1+ x} Al _x Ge _{2– x}（PO ₄）_3的复合SEs（LAGP）作为离子传导的主要介质，而聚合物P（VDF-HFP）作为基质。同时，我们首次选择了聚合物中溶胀的离子液体的高化学稳定性，热稳定性和电化学稳定性，这可以显着改善电池中的界面。另外，还可以降低电解质中聚合物的结晶度。所有这些导致复合电解质（LPELCE）的良好的离子电导率，同时，与锂电极的良好的相容性。特别地，还可以观察到抑制锂树枝状晶体的生长的高机械强度和稳定的固体电解质中间相，以及高的热安全稳定性。为了进一步说明，LiFePO ₄固态锂电池/ LPELCE / Li显示出相对令人满意的性能，表明使用这种类型的电解质开发高安全性和高能量密度的固态锂电池的潜在潜力。

更新日期：2017-11-22

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