Fast Ag-Ion-Conducting GeS2–Sb2S3–AgI Glassy Electrolytes with Exceptionally Low Activation Energy,The Journal of Physical Chemistry C

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Fast Ag-Ion-Conducting GeS2–Sb2S3–AgI Glassy Electrolytes with Exceptionally Low Activation Energy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acs.jpcc.7b10630
Changgui Lin _{1,

2} , Erwei Zhu _{1,

2} , Jingsong Wang _{1,

2} , Xuhao Zhao _{1,

2} , Feifei Chen _{1,

2} , Shixun Dai _{1,

2}

Affiliation

Silver-ion-sconducting solid electrolytes with low activation energy are important because of their distinctive application potential in solid-state batteries operated within a broad temperature range, especially below room temperature. Achieving glassy solid electrolytes with high ionic conductivity, low activation energy, and good thermal stability is a continuous challenge for the design and synthesis of novel fast ion-conducting glasses. Here, we report markedly low activation energy and high room-temperature ionic conductivity in melt-quenched GeS₂–Sb₂S₃–AgI chalcogenide glasses. Homogeneous 2.5GeS₂–27.5Sb₂S₃–70AgI glass presenting high glass transition temperature of 135 °C shows high ionic conductivity of 9.18 × 10^–3 S/cm at 25 °C and low activation energy of 0.07 eV, which is the lowest among those of Ag-ion glassy electrolytes. Structural characterization by using Raman spectra suggests that, in the disordered network structure of GeS₂–Sb₂S₃–AgI glasses, the formation of chain fragments composed by [SbS_3–xI_x]_n, which is similar to the double chain of [(SbSI)_∞]₂ in the SbSI crystal structure, provides possible diffusion pathways to facilitate low-barrier concerted migration of silver ions.

中文翻译：

具有极低活化能的快速传导银离子的GeS ₂ -Sb ₂ S ₃ -AgI玻璃态电解质

具有低活化能的导电银离子的固体电解质非常重要，因为它们在广泛的温度范围内，特别是在室温以下工作的固态电池中具有独特的应用潜力。实现具有高离子电导率，低活化能和良好热稳定性的玻璃状固体电解质对于新型快速离子导电玻璃的设计和合成一直是一个挑战。在这里，我们报道了在熔融淬火的GeS ₂ –Sb ₂ S ₃ –AgI硫族化物玻璃中，活化能极低，室温离子传导率极高。均匀的2.5GeS ₂ –27.5Sb ₂ S ₃呈现高玻璃化转变温度135°C的–70AgI玻璃在25 °C时表现出9.18×10 ^–3 S / cm的高离子电导率和0.07 eV的低活化能，这在Ag离子玻璃态电解质中是最低的。利用拉曼光谱的结构表征表明，在GeS ₂ –Sb ₂ S ₃ –AgI玻璃的无序网络结构中，由[SbS _{3– x} I _x ] _n组成的链片段的形成类似于双链。SbSI晶体结构中的[（SbSI）_∞ ] ₂的分布提供了可能的扩散途径，以促进银离子的低势垒协同迁移。

更新日期：2018-01-17

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