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The formation of LiAl5O8 nanowires from bulk Li-Al alloy enables dendrite-free Li metal batteries
Materials Today Physics ( IF 11.5 ) Pub Date : 2021-03-27 , DOI: 10.1016/j.mtphys.2021.100395
Y. Wu , D. Lei , C. Wang

Lithium metal has been regarded as an ideal anode to meet the rapidly growing requirements on high energy density batteries, owing to their highest gravimetric capacity and their lowest redox potential. However, lithium metal batteries persistently suffer from serious issues, such as the unstable solid electrolyte layer and uncontrolled dendrite growth during plating/stripping, especially under high current density. Herein, we developed an innovative method to prepare dense LiAl5O8 nanowires membrane and designed a LiAl5O8 nanowires membrane/poly (vinylidene fluoride-co-hexafluoropropylene)-based gel polymer composite electrolyte (LPH-GPE) to address these issues. On the interface of LPH-GPE and lithium anode, uniformly dispersed aluminum is in situ generated by reducing LiAl5O8 nanowires, which brings both superlithiophilic sites and uniform lithium ion flux, and thus enables the lithium ion depositing in plates rather than forming sharp lithium dendrites. The solid-state lithium/lithium symmetric cells with LPH-GPE exhibit significantly improved lifespan at 0.5 mA cm2 and short-circuit does not occur even at current density up to 4 mA cm2.



中文翻译:

由块状锂铝合金形成LiAl 5 O 8纳米线可实现无枝晶的锂金属电池

金属锂由于具有最高的重量容量和最低的氧化还原电位,因此被认为是满足高能量密度电池快速增长的需求的理想阳极。然而,锂金属电池持续遭受严重的问题,例如不稳定的固体电解质层和镀覆/剥​​离期间的枝晶生长不受控制,特别是在高电流密度下。在这里,我们开发了一种创新的方法来制备致密的LiAl 5 O 8纳米线膜,并设计了LiAl 5 O 8纳米线膜/聚(偏二氟乙烯-六氟丙烯共聚物)基凝胶聚合物复合电解质(LPH-GPE)来解决这些问题。在LPH-GPE和锂阳极的界面上,通过还原LiAl 5 O 8纳米线原位生成了均匀分散的铝,这带来了超亲锂性位点和均匀的锂离子通量,从而使锂离子沉积在板中而不是形成尖锐的锂枝晶。具有LPH-GPE的固态锂/锂对称电池在0.5 mA cm - 2时的使用寿命显着提高,即使在电流密度高达4 mA cm - 2时也不会发生短路。

更新日期:2021-04-04
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