NASICON Li 1.2 Mg 0.1 Zr 1.9 (PO 4 ) 3 Solid Electrolyte for an All‐Solid‐State Li‐Metal Battery
NASICON Li 1.2 Mg 0.1 Zr 1.9 (PO 4 ) 3 Solid Electrolyte for an All‐Solid‐State Li‐Metal Battery
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DOI：
10.1002/smtd.202000764
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Qiongyu Zhou;Biyi Xu;Po‐Hsiu Chien;Yutao Li;Bing Huang;Nan Wu;Henghui Xu;N. Grundish;Yan‐Yan Hu-Ya
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文献类型：
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作者：
Qiongyu Zhou;Biyi Xu;Po‐Hsiu Chien;Yutao Li;Bing Huang;Nan Wu;Henghui Xu;N. Grundish;Yan‐Yan Hu-Ya
具有高Li+传导性的薄固体电解质用于在全固态锂金属电池中分离金属锂阳极和阴极。然而，大多数固体锂离子电解质具有小的电化学稳定窗口、大的界面电阻，并且当在电池充电时电镀锂时不能阻止锂枝晶生长。Mg 2+使式Li1.2Mg0.1Zr1.9（PO 4）3（LMZP）的菱形NASICON-结构的固体电解质稳定。这种固体电解质在25 °C下的锂离子电导率比三斜晶系LiZr 2（PO 4）3高两个数量级。7 Li和6Li NMR证实了NASICON框架的两个不同晶体位置中的锂离子，其中85%的锂离子具有比其他15%相对更高的迁移率。阳极-电解质界面通过对称Li/LMZP/Li电池测试进一步研究，而阴极-电解质界面通过全固态Li/LMZP/LiFePO 4电池探索。通过Li1.2Mg0.1Zr1.9（PO 4）3固体电解质实现的这些电池的增强的性能在重复充电/放电循环时是稳定的。
A thin solid electrolyte with a high Li+conductivity is used to separate the metallic lithium anode and the cathode in an all‐solid‐state Li‐metal battery. However, most solid Li‐ion electrolytes have a small electrochemical stability window, large interfacial resistance, and cannot block lithium‐dendrite growth when lithium is plated on charging of the cell. Mg2+stabilizes a rhombohedral NASICON‐structured solid electrolyte of the formula Li1.2Mg0.1Zr1.9(PO4)3(LMZP). This solid electrolyte has Li‐ion conductivity two orders of magnitude higher at 25 °C than that of the triclinic LiZr2(PO4)3.7Li and6Li NMR confirm the Li‐ions in two different crystallographic sites of the NASICON framework with 85% of the Li‐ions having a relatively higher mobility than the other 15%. The anode–electrolyte interface is further investigated with symmetric Li/LMZP/Li cell testing, while the cathode–electrolyte interface is explored with an all‐solid‐state Li/LMZP/LiFePO4cell. The enhanced performance of these cells enabled by the Li1.2Mg0.1Zr1.9(PO4)3solid electrolyte is stable upon repeated charge/discharge cycling.