In situ formation of a LiF and Li–Al alloy anode protected layer on a Li metal anode with enhanced cycle life†,Journal of Materials Chemistry A

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In situ formation of a LiF and Li–Al alloy anode protected layer on a Li metal anode with enhanced cycle life†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-06 , DOI: 10.1039/c9ta10965j
Lili Wang _{1,

2,

3,

4,

5} , Shiyang Fu _{1,

2,

3,

4,

5} , Teng Zhao _{1,

2,

3,

4,

5} , Ji Qian _{1,

2,

3,

4,

5} , Nan Chen _{1,

2,

3,

4,

5} , Li Li _{1,

2,

3,

4,

5} , Feng Wu _{1,

2,

3,

4,

5} , Renjie Chen _{1,

2,

3,

4,

5}

Affiliation

Development of next-generation high-energy lithium (Li) metal batteries is hindered by uncontrollable growth of Li dendrites and the unstable Li/electrolyte interface during repeated Li plating/stripping. To overcome these issues, artificial protection for Li metal prior to assembling the cell/battery is needed. Here we show a facile approach to in situ coating of a protected layer on the Li metal anode by directly placing a PVDF-HFP/AlF₃ modified Celgard separator on its surface. We find that AlF₃ can react with highly reactive Li metal and produce a LiF coating on Li metal in situ. This LiF-rich SEI layer can effectively passivate the highly active Li anode surface and suppress the lithium dendrite growth, forming a uniform structure on the Li/electrolyte interface that reduces interfacial impedance. Owing to the enhanced interface stability, the Li‖Li cell presents a stable polarization voltage for approximately 600 h compared with the blank cell (45 h). The Li‖LiFePO₄ cell with the composite separator has a high capacity retention of 78.3% after 300 cycles at the 3C rate, exhibiting an improvement in the cycling life of high energy-density Li metal batteries.

中文翻译：

在锂金属阳极上原位形成LiF和Li–Al合金阳极保护层，从而提高了循环寿命†

Li树枝状晶体的不可控制的生长以及在重复的Li电镀/剥离过程中不稳定的Li /电解质界面阻碍了下一代高能锂（Li）金属电池的开发。为了克服这些问题，需要在组装电池/电池之前对锂金属进行人工保护。在这里，我们展示了一种通过在其表面上直接放置PVDF-HFP / AlF ₃改性的Celgard隔膜在Li金属阳极上原位涂覆保护层的简便方法。我们发现，AlF ₃可以与高反应性的Li金属发生反应，并在Li金属上原位生成LiF涂层。。这种富含LiF的SEI层可以有效地钝化高活性的Li阳极表面并抑制锂枝晶的生长，从而在Li /电解质界面上形成均匀的结构，从而降低界面阻抗。由于提高了界面稳定性，与空白电池（45小时）相比，Li'Li电池可提供约600 h的稳定极化电压。所述Li‖LiFePO ₄与复合隔板电池具有78.3％的速率3C 300次循环后的高容量保持率，显示出在高能量密度的锂金属电池的循环寿命的改善。

更新日期：2019-12-18

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