High-performance Li6.4La3Zr1.4Ta0.6O12/Poly(ethylene oxide)/Succinonitrile composite electrolyte for solid-state lithium batteries
High-performance Li6.4La3Zr1.4Ta0.6O12/Poly(ethylene oxide)/Succinonitrile composite electrolyte for solid-state lithium batteries
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DOI：
10.1016/j.jpowsour.2018.07.005
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发表时间：
2018-09
影响因子：
9.2
通讯作者：
Wenping Zha;Fei Chen;Dunjie Yang;Q. Shen;Lianmeng Zhang
中科院分区：
文献类型：
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作者：
Wenping Zha;Fei Chen;Dunjie Yang;Q. Shen;Lianmeng Zhang
在这项工作中，可扩展的陶瓷-聚合物复合电解质组成的Li6.4La3Zr1.4Ta0.6O12，聚（环氧乙烷），锂双（三氟甲烷）磺酰亚胺，和固体增塑剂丁二腈制备的柔性膜的形式。系统地研究了该电解质的离子传输性能、电化学稳定性以及与锂电极的界面行为。在这些电解质中，含有60重量%的样品Li6.4La3Zr1.4Ta0.6O12和10重量%丁二腈在30 °C时的最大电导率为1.22 × 10−4S cm-1，并表现出5.5 V的电化学稳定性窗口。该电解质的离子迁移数提高到0.41，在静态和动态条件下与锂电极的界面相容性都很好。Li/LiFePO 4电池优异的循环性能和倍率性能是由于增强的离子传输性能和改善的电解质与电极之间的界面接触。在0.5C下运行的电池在60 °C下经过200次循环后提供151.1 mAh·g− 1的放电比容量，并保持最大比容量的98%。值得注意的是，这种电池也可以在45 °C下成功充电和放电，并且在0.5 C下70次循环后仍然提供124.1 mAh·g− 1的放电容量。
In this work, the scalable ceramic-polymer composite electrolytes composed of Li6.4La3Zr1.4Ta0.6O12, poly (ethylene oxide), lithium bis(trifluoromethane)sulfonimide, and solid plasticizer succinonitrile are prepared in the form of flexible membranes. The ionic transport properties, electrochemical stability, and interfacial behaviors against lithium electrode of this electrolyte are systematically investigated. Among these electrolytes, the sample containing 60 wt.% Li6.4La3Zr1.4Ta0.6O12and 10 wt.% succinonitrile presents a maximum conductivity of 1.22 × 10−4S cm-1at 30 °C, and exhibits a broadened electrochemical stability window of 5.5 V vs. Li/Li+. Moreover, the ionic transference number of this electrolyte is improved to 0.41, and the interfacial compatibility against lithium electrode is excellent under both static and dynamic conditions. Excellent cycling and rate performance of the Li/LiFePO4cells are resulted from the enhanced ionic transport properties and improved interfacial contact between electrolyte and electrodes. The cell run at 0.5C delivers a discharge specific capacity of 151.1 mAh·g−1after 200 cycles under 60 °C, and retains 98% of the maximum specific capacity. Notably, this cell also can be successfully charged and discharged at 45 °C and still delivers a discharge capacity of 124.1 mAh·g−1after 70 cycles at 0.5 C.