One-Step Processing of Soft Electrolyte/Metallic Lithium Interface for High-Performance Solid-State Lithium Batteries,ACS Applied Energy Materials

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One-Step Processing of Soft Electrolyte/Metallic Lithium Interface for High-Performance Solid-State Lithium Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-09 00:00:00 , DOI: 10.1021/acsaem.0c01470
Jiaxu Zhang _{1,

2} , Jun Li ₁ , Huiyu Zhai _{1,

2} , Gangjian Tan ₁ , Xinfeng Tang ₁

Affiliation

Cubic garnet-type Li₇La₃Zr₂O₁₂ (LLZO) is a remarkable Li-ion electrolyte for solid-state lithium metal batteries due to its high ion conductivity and perfect electrochemical stability against lithium metal anode. However, the application of LLZO is hindered by the poor interfacial contact between garnet and lithium metal. Herein, LLZO powder was sandwiched by graphite foils and densified by a one-step hot press process. After peeling off the graphite foils from the LLZO pellet, the residual thin layer of graphite (∼0.15 μm) can be easily lithiated in contact with lithium metal. This buffer layer not only greatly improves the wettability and interfacial contact between LLZO and lithium metal but also significantly relieves the volume expansion of lithium metal during cycling. The assembled symmetric cell cycled over 1500 h at 0.1 mA cm^–2 with excellent stability. Moreover, the hybrid-state full cell also shows good electrochemical performance.

中文翻译：

高性能固态锂电池的软电解质/金属锂界面的一步处理

立方石榴石型Li ₇ La ₃ Zr ₂ O ₁₂（LLZO）是一种用于固态锂金属电池的出色锂离子电解质，因为其高离子电导率和针对锂金属阳极的完美电化学稳定性。但是，石榴石和锂金属之间不良的界面接触阻碍了LLZO的应用。此处，LLZO粉末被石墨箔夹在中间，并通过一步热压工艺进行致密化。从LLZO颗粒上剥离石墨箔后，残留的石墨薄层（约0.15μm）可以很容易地锂化，与锂金属接触。该缓冲层不仅大大改善了LLZO和锂金属之间的润湿性和界面接触，而且还大大减轻了循环过程中锂金属的体积膨胀。组装好的对称电池在0.1 mA cm ^{–2的条件下}循环1500小时具有出色的稳定性。此外，混合态全电池还显示出良好的电化学性能。

更新日期：2020-07-09

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